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Danfoss VLT Midi Drive FC-280PK37 [29/92] Pid control
![Danfoss VLT Midi Drive FC-280PK37 [29/92] Pid control](/views2/1557235/page29/bg1d.png)
2.5 PID Control
2.5.1 Speed PID Control
Parameter 1-00 Conguration Mode
Parameter 1-01 Motor Control Principle
U/f
VVC
+
[1] Speed closed loop
Not available
1)
Active
Table 2.5 Control Congurations, Active Speed Control
1) Not available indicates that the
specic mode is not available at all.
The following parameters are relevant for the speed control:
Parameter Description of function
Parameter 7-00 Speed PID Feedback Source Select from which input the speed PID gets its feedback.
Parameter 7-02 Speed PID Proportional Gain The higher the value, the quicker the control. However, too high a value may lead to
oscillations.
Parameter 7-03 Speed PID Integral Time Eliminates steady state speed error. Lower values mean quicker reaction. However, too low
a value may lead to oscillations.
Parameter 7-04 Speed PID Dierentiation Time Provides a gain proportional to the rate of change of the feedback. A setting of 0 disables
the dierentiator.
Parameter 7-05 Speed PID Di. Gain Limit If there are quick changes in reference or feedback in a given application, which means
that the error changes swiftly, the dierentiator may soon become too dominant. This is
because it reacts to changes in the error. The quicker the error changes, the stronger the
dierentiator gain is. The dierentiator gain can thus be limited to allow setting of the
reasonable dierentiation time for slow changes and a suitably quick gain for quick
changes.
Parameter 7-06 Speed PID Lowpass Filter Time A low-pass lter that dampens oscillations on the feedback signal and improves steady
state performance. However, too long a lter time deteriorates the dynamic performance of
the speed PID control.
Practical settings of parameter 7-06 Speed PID Lowpass Filter Time taken from the number of
pulses per revolution on from encoder (PPR):
Encoder PPR Parameter 7-06 Speed PID Lowpass Filter
Time
512 10 ms
1024 5 ms
2048 2 ms
4096 1 ms
Table 2.6 Speed Control Parameters
Product Overview Design Guide
MG07B102 Danfoss A/S © 03/2016 All rights reserved. 27
2 2
Содержание
- Additional resources 3
- Approvals and certifications 3
- Contents 3
- Control structures 3
- Definitions 3
- Document and software version 3
- Electrical installation 3
- Enclosure size overview 3
- Introduction 3
- Pid control 3
- Product overview 3
- Purpose of the design guide 3
- Reference handling 3
- Safety 3
- Application examples 4
- Brake functions 4
- Emc emission and immunity 4
- Extreme running conditions 4
- Galvanic isolation 4
- Ground leakage current 4
- Introduction 4
- Maintenance and service for sto 4
- Safe torque off installation 4
- Safe torque off sto 4
- Safety precautions for sto 4
- Smart logic controller 4
- Sto commissioning 4
- Sto technical data 4
- Examples 5
- Fc protocol 5
- Fc protocol message framing structure 5
- Introduction 5
- Modbus rtu 5
- Modbus rtu message framing structure 5
- Network configuration 5
- Rs485 installation and set up 5
- Acoustic noise 6
- Ambient conditions 6
- Cable specifications 6
- Connection tightening torques 6
- Control input output and control data 6
- Danfoss fc control profile 6
- Efficiency 6
- Examples 6
- Fuses and circuit breakers 6
- How to access parameters 6
- Mains supply 3 phase 6
- Motor output and motor data 6
- Ordering numbers brake resistors 6
- Ordering numbers options and accessories 6
- Power dependent specifications 6
- Specifications 6
- Type code and selection 6
- Du dt conditions 7
- Special conditions 7
- Additional resources 8
- Definitions 8
- Frequency converter 8
- Introduction 8
- Purpose of the design guide 8
- Miscellaneous 9
- References 9
- Approvals and certifications 11
- Ce mark 11
- Document and software version 11
- Emc directive 11
- Low voltage directive 11
- Safety 12
- Enclosure size depends on power range 13
- Enclosure size overview 13
- Product overview 13
- Product overview design guide 13
- A analog d digital built in brake chopper is only available on 3 phase units terminal 53 can also be used as digital input switch s801 bus terminal can be used to enable termination on the rs485 port terminals 68 and 69 refer to chapter 4 safe torque off sto for the correct sto wiring 14
- Danfoss a s 03 2016 all rights reserved mg07b102 14
- Electrical installation 14
- Illustration 2 basic wiring schematic drawing 14
- Midi drive fc 280 14
- Product overview vl 14
- This section describes how to wire the frequency converter 14
- Product overview design guide 15
- Motor connection 16
- Warning 16
- Ac mains connection 17
- Control terminal types 18
- Illustration 2 shows the removable frequency converter connectors terminal functions and default settings are summarized in table 2 and table 2 18
- Midi drive fc 280 18
- Product overview vl 18
- See chapter 7 control input output and control data for terminal ratings details 18
- Control modes 19
- Control structures 19
- Notice 19
- Wiring to control terminals 19
- And parameter 1 00 configuration mode is set to 0 speed open loop the resulting reference from the reference handling system 21
- Control principle 21
- Control structure in vv 21
- Fc 280 frequency converters can handle asynchronous motors and permanent magnet synchronous motors up to 22 kw 30 hp 21
- In the configuration shown in illustration 2 0 parameter 1 01 motor control principle is set to 1 vv 21
- Product overview design guide 21
- The current sensing principle in fc 280 frequency converters is based on the current measurement by a resistor in the dc link the ground fault protection and short circuit behavior are handled by the same resistor 21
- Vlt midi drive fc 280 is a general purpose frequency converter for variable speed applications the control principle is based on vv 21
- Internal current control in vv 22
- Local hand on and remote auto on control 22
- Local reference the local reference is active when the frequency converter is operated with hand on active adjust the reference by 23
- Product overview design guide 23
- Reference handling 23
- Remote reference the reference handling system for calculating the remote reference is shown in illustration 2 3 23
- Reference limits 24
- Scaling of analog and pulse references and feedback 25
- Scaling of preset references and bus references 25
- Case 1 positive reference with dead band digital input to trigger reverse part i illustration 2 9 shows how reference input with limits inside minimum to maximum limits clamps 26
- Dead band around zero 26
- Ensure that both points defining the scaling graph are in the same quadrant 26
- Midi drive fc 280 26
- P1 or p2 defines the size of the dead band as shown in illustration 2 8 26
- Product overview vl 26
- Set either the minimum reference value see table 2 for relevant parameter or maximum reference value at 0 in other words either p1 or p2 must be on the x axis in illustration 2 8 26
- Sometimes the reference in rare cases also the feedback should have a dead band around 0 to ensure that the machine is stopped when the reference is near 0 26
- The endpoints p1 and p2 are defined in table 2 depending on the choice of input 26
- To make the dead band active and to set the amount of dead band do the following 26
- Illustration 2 9 clamping of reference input with limits inside minimum to maximum 27
- Mg07b102 danfoss a s 03 2016 all rights reserved 25 27
- Product overview design guide 27
- Case 2 positive reference with dead band digital input to trigger reverse part ii illustration 2 0 shows how reference input with limits outside maximum to maximum limits clamps to the input low and high limits before adding to external reference and how the external reference is clamped to maximum to maximum by the reference algorithm 28
- Danfoss a s 03 2016 all rights reserved mg07b102 28
- Illustration 2 0 clamping of reference input with limits outside maximum to maximum 28
- Midi drive fc 280 28
- Product overview vl 28
- Pid control 29
- Product overview design guide 29
- Speed pid control 29
- The following parameters are relevant for the speed control 29
- Example of programming the speed control in this example the speed pid control is used to maintain a constant motor speed regardless of the changing load on the motor the required motor speed is set via a potentiometer connected to terminal 53 the speed range is 0 1500 rpm corresponding to 0 10 v over the potentiometer a switch connected to terminal 18 controls starting and stopping the speed pid monitors the actual rpm of the motor by using a 24 v htl incremental encoder as feedback the feedback sensor is an encoder 1024 pulses per revolution connected to terminals 32 and 33 the pulse frequency range to terminals 32 and 33 is 4 hz 32 khz 30
- Follow the steps in table 2 to program the speed control see explanation of settings in the programming guide in table 2 it is assumed that all other parameters and switches remain at their default setting 30
- Midi drive fc 280 30
- Product overview vl 30
- Product overview design guide 31
- Midi drive fc 280 32
- Notice 32
- Process pid control 32
- Product overview vl 32
- Table 2 shows the control configurations in which the process control is possible refer to chapter 2 control structures to see where the speed control is active 32
- The process control pid works under the default parameter setting but tuning the parameters is recommended to optimize the application control performance 32
- The process pid control can be used to control application parameters that can be measured by a sensor for example pressure temperature flow and affected by the connected motor through a pump fan or other connected devices 32
- Process control relevant parameters 33
- Product overview design guide 33
- Example of process pid control 34
- Product overview design guide 35
- After configuring the basic settings as described in chapter 2 programming order optimize the proportional gain the integration time and the differentiation time parameter 7 33 process pid proportional gain parameter 7 34 process pid integral time and parameter 7 35 process pid differentiation time in most processes complete the following procedure 36
- If necessary start stop can be activated several times to provoke a variation of the feedback signal 36
- Integration time until the feedback signal stabilizes followed by an increase of 15 50 36
- Midi drive fc 280 36
- Notice 36
- Only use parameter 7 35 process pid differentiation time for fast acting systems differentiation time the typical value is 4 times the set integration time use the differentiator when the setting of the proportional gain and the integration time has been fully optimized make sure that the lowpass filter dampens the oscillations on the feedback signal sufficiently 36
- Process controller optimization 36
- Product overview vl 36
- Set parameter 7 33 process pid proportional gain to 0 and increase it until the feedback signal again begins to vary continuously reduce the value until the feedback signal has stabilized lower the proportional gain by 40 60 36
- Set parameter 7 34 process pid integral time to 20 s and reduce the value until the feedback signal again begins to vary continuously increase the 36
- Start the motor 36
- Notice 37
- Ziegler nichols tuning method 37
- Emc emission and immunity 38
- General aspects of emc emission 38
- Emc emission requirements 39
- Product overview design guide 39
- The test results in table 2 2 have been obtained using a system with a frequency converter with the mounting plate a motor and shielded motor cables 39
- To reduce the interference level from the entire system unit and installation make motor and brake cables as short as possible avoid placing cables with a sensitive signal level alongside mains motor and brake cables radio interference higher than 50 mhz airborne is especially generated by the control electronics 39
- When using unshielded cables some emission requirements are not complied with although the immunity requirements are observed 39
- A control box with potentiometer motor cable and motor 40
- A frequency converter with options if relevant 40
- A shielded control cable 40
- Emc immunity requirements 40
- En 61000 4 2 iec 61000 4 2 electrostatic discharges esd simulation of electrostatic discharges from human beings 40
- En 61000 4 3 iec 61000 4 3 radiated immunity amplitude modulated simulation of the effects of radar and radio communication equipment and mobile communications equipment 40
- En 61000 4 4 iec 61000 4 4 burst transients simulation of interference caused by switching a contactor relay or similar devices 40
- En 61000 4 5 iec 61000 4 5 surge transients simulation of transients caused by for example lightning that strikes near installations 40
- En 61000 4 6 iec 61000 4 6 conducted immunity simulation of the effect from radio transmission equipment joined by connection cables 40
- Midi drive fc 280 40
- Product overview vl 40
- The immunity requirements for frequency converters depend on the environment in which they are installed the requirements for the industrial environment are higher than the requirements for the home and office environment all danfoss frequency converters comply with the requirements for the industrial environment therefore they also comply with the lower requirements for home and office environment with a large safety margin 40
- The immunity requirements should follow product standard iec 61800 3 and danfoss internal standards see table 2 3 for details 40
- The tests were performed in accordance with the following basic standards 40
- To document immunity against burst transient from electrical phenomena the following immunity tests have been made on a system consisting of 40
- Galvanic isolation 41
- Ground leakage current 41
- Warning 41
- Brake functions 42
- Mechanical holding brake 42
- Notice 42
- Brake resistor selection 43
- Dynamic braking 43
- Notice 43
- Control with brake function 44
- Notice 44
- Smart logic controller 44
- Comparators comparators are used for comparing continuous variables for example output frequency output current and analog input to fixed preset values 45
- Events and actions are each numbered and linked in pairs states this means that when event 0 is fulfilled attains the value true action 0 is executed after this the conditions of event 1 are evaluated and if evaluated true action 1 is executed and so on only 1 event is evaluated at any time if an event is evaluated as false nothing happens in the slc during the current scan interval and no other events are evaluated when the slc starts it evaluates event 0 and only event 0 each scan interval only when event 0 is evaluated true the slc executes action 0 and starts evaluating event 1 it is possible to program 1 20 events and actions when the last event action has been executed the sequence starts over again from event 0 action 0 illustration 2 4 shows an example with 3 event actions 45
- Extreme running conditions 45
- Illustration 2 3 associated action 45
- Illustration 2 4 sequence with 3 events actions 45
- Illustration 2 5 comparators 45
- Illustration 2 6 logic rules 45
- Logic rules combine up to 3 boolean inputs true false inputs from timers comparators digital inputs status bits and events using the logical operators and or and not 45
- Mg07b102 danfoss a s 03 2016 all rights reserved 43 45
- Product overview design guide 45
- Short circuit motor phase to phase the frequency converter is protected against short circuits by current measurement in each of the 3 motor phases or in the dc link a short circuit between 2 output phases causes an overcurrent in the frequency converter the frequency converter is turned off individually when the short circuit current exceeds the permitted value alarm 16 trip lock 45
- Switching on the output switching on the output between the motor and the frequency converter is fully allowed and does not damage the frequency converter however fault messages may appear 45
- Motor thermal protection 46
- Application examples 47
- Closed loop drive system 47
- Encoder connection 47
- Encoder direction 47
- Introduction 47
- Application examples 48
- Application examples vl 48
- If terminal 12 and 27 are not connected set parameter 5 12 terminal 27 digital input to 0 no operation 48
- Midi drive fc 280 48
- Notice 48
- Application examples design guide 49
- Start stop 49
- Application examples vl 50
- External alarm reset 50
- Midi drive fc 280 50
- Motor thermistor 50
- Notice 50
- To meet pelv insulation requirements use reinforced or double insulation on the thermistors 50
- Safe torque off sto 51
- Notice 52
- Warning 52
- Notice 53
- Warning 53
- Maintenance and service for sto 54
- Notice 54
- Test for sto applications in automatic restart mode 54
- Test for sto applications in manual restart mode 54
- A safe error for example output in safe state is repaired within 8 hours 55
- Failure rates are based on the siemens sn29500 database 55
- Failure rates are constant wear out mechanisms are not included 55
- For each channel the safety related components are considered to be of type a with a hardware fault tolerance of 0 55
- Midi drive fc 280 takes 10 of the total failure budget for an sil2 safety loop 55
- Mounted verify that alarm 188 sto function fault is logged in parameter 15 30 alarm log error code 55
- No torque output is the safe state 55
- Reapply 24 v supply to terminal 37 and verify that resetting the alarm is successful 55
- Reapply 24 v supply to terminal 38 and verify that resetting the alarm is successful 55
- Remove the 24 v supply for terminal 38 and verify that the lcp shows alarm 188 sto function fault if the lcp is mounted if the lcp is not 55
- Safe torque off sto design guide 55
- Sto technical data 55
- The failure modes effects and diagnostic analysis fmeda is performed based on the following assumptions 55
- The stress levels are average for an industrial environment and the working temperature of components is up to 85 c 185 f 55
- Introduction 56
- Network connection 56
- Notice 56
- Overview 56
- Rs485 installation and set up 56
- Emc precautions 57
- Fc protocol 57
- Hardware set up 57
- Notice 57
- Overview 57
- Parameter settings for modbus communication 57
- Content of a character byte 58
- Fc protocol message framing structure 58
- Fc with modbus rtu 58
- Network configuration 58
- Telegram length lge 58
- Telegram structure 58
- Address format 1 126 59
- Bit 0 6 0 broadcast 59
- Bit 0 6 frequency converter address 1 126 59
- Bit 7 1 address format 1 126 active 59
- Bits 12 15 transfer parameter commands from master to slave and return processed slave responses to the master 59
- Control word and reference value from master to slave 59
- Data control byte bcc 59
- Frequency converter address adr 59
- If the command cannot be performed the slave sends this response 0111 command cannot be performed and issues the following fault report in table 5 59
- Parameter block the parameter block is used to transfer parameters between master and slave the data block is made up of 12 bytes 6 words and also contains the process block 59
- Parameter command and response ak 59
- Parameter number pnu 59
- Process block pcd the pcd is made up of a data block of 4 bytes 2 words and contains 59
- Rs485 installation and set design guide 59
- Status word and present output frequency from slave to master 59
- Text block the text block is used to read or write texts via the data block 59
- The 3 types of telegram are 59
- The checksum is calculated as an xor function before the first byte in the telegram is received the calculated checksum is 0 59
- The data field 59
- The pke field 59
- The pke field contains 2 subfields 59
- The slave returns the address byte unchanged to the master in the response telegram 59
- The structure of data blocks depends on the type of telegram there are 3 telegram types and the type applies for both control telegrams master slave and response telegrams slave master 59
- Bits 0 11 transfer parameter numbers the function of the relevant parameter is defined in the parameter description in the vl 60
- Byte of the telegram lge when using text transfer the index character indicates whether it is a read or a write command 60
- Conversion 60
- Data types supported by the frequency converter 60
- Index ind 60
- Midi drive fc 280 60
- Midi drive fc 280 programming guide 60
- Only the low byte is used as an index 60
- Parameter 0 01 language select the data value by entering the value in the pwe block serial communication is only capable of reading parameters containing data type 9 text string 60
- Parameter 15 40 fc type to parameter 15 53 power card serial number contain data type 9 for example read the unit size and mains voltage range in parameter 15 40 fc type when a text string is transferred read the length of the telegram is variable and the texts are of different lengths the telegram length is defined in the 60
- Parameter 4 12 motor speed low limit hz has a conversion factor of 0 to preset the minimum frequency to 10 hz transfer the value 100 a conversion factor of 0 means that the value transferred is multiplied by 0 the value 100 is thus perceived as 10 60
- Parameter number pnu 60
- Parameter value pwe 60
- Rs485 installation and set vl 60
- The index is used with the parameter number to read write access parameters with an index for example parameter 15 30 alarm log error code the index consists of 2 bytes a low byte and a high byte 60
- The parameter value block consists of 2 words 4 bytes and the value depends on the defined command ak the master prompts for a parameter value when the pwe block contains no value to change a parameter value write write the new value in the pwe block and send from the master to the slave 60
- The programming guide contains the descriptions of attributes of each parameter parameter values are transferred as whole numbers only conversion factors are used to transfer decimals 60
- To read a text via the pwe block set the parameter command ak to f hex the index character high byte must be 4 60
- Unsigned means that there is no operational sign in the telegram 60
- When a slave responds to a parameter request read command the present parameter value in the pwe block is transferred and returned to the master if a parameter contains several data options for example 60
- Examples 61
- Notice 61
- Process words pcd 61
- Reading a parameter value 61
- Writing a parameter value 61
- Frequency converter with modbus rtu 62
- Modbus rtu 62
- Network configuration 62
- Overview 62
- Prerequisite knowledge 62
- Address field 63
- Function field 63
- Introduction 63
- Modbus rtu message framing structure 63
- Modbus rtu telegram structure 63
- Start stop field 63
- Coil or register addresses 64
- Coil register addressing 64
- Crc check field 64
- Data field 64
- In modbus all data is organized in coils and holding registers coils hold a single bit whereas holding registers hold a 2 byte word that is 16 bits all data addresses in modbus telegrams are referenced to 0 the first occurrence of a data item is addressed as item number 0 for example the coil known as coil 1 in a programmable controller is addressed as coil 0000 in the data address field of a modbus telegram coil 127 decimal is addressed as coil 007ehex 126 decimal holding register 40001 is addressed as register 0000 in the data address field of the telegram the function code field already specifies a holding register operation therefore the 4xxxx reference is implicit holding register 40108 is addressed as register 006bhex 107 decimal 64
- Midi drive fc 280 64
- Rs485 installation and set vl 64
- Telegrams include an error checking field operating based on a cyclic redundancy check crc method the crc field checks the contents of the entire telegram it is applied regardless of any parity check method used for the individual characters of the telegram the transmitting device calculates the crc value and appends the crc as the last field in the telegram the receiving device recalculates a crc during receipt of the telegram and compares the calculated value to the actual value received in the crc field 2 unequal values result in bus timeout the error checking field contains a 16 bit binary value implemented as 2 8 bit bytes after the implementation the low order byte of the field is appended first followed by the high order byte the crc high order byte is the last byte sent in the telegram 64
- The count of actual data bytes in the field 64
- The data field is constructed using sets of 2 hexadecimal digits in the range of 00 ff hexadecimal these digits are made up of 1 rtu character the data field of telegrams sent from a master to a slave device contains additional information which the slave must use to perform accordingly 64
- The information can include items such as 64
- The quantity of items to be handled 64
- Rs485 installation and set design guide 65
- Examples reading parameter 3 12 catch up slow down value 16 bit the holding register 3120 holds the parameters value a value of 1352 decimal means that the parameter is set to 12 2 66
- For a full explanation of the structure of an exception code response refer to chapter 5 function field 66
- For information on the parameters size and conversion index see the vl 66
- Function codes supported by modbus rtu 66
- How to access parameters 66
- How to control the frequency converter 66
- Midi drive fc 280 66
- Midi drive fc 280 programming guide 66
- Modbus exception codes 66
- Modbus rtu supports use of the following function codes in the function field of a telegram 66
- Parameter handling 66
- Reading parameter 3 14 preset relative reference 32 bit the holding registers 3410 and 3411 hold the parameters values a value of 11300 decimal means that the parameter is set to 1113 0 66
- Rs485 installation and set vl 66
- The pnu parameter number is translated from the register address contained in the modbus read or write telegram the parameter number is translated to modbus as 10 x parameter number decimal 66
- This section describes codes which can be used in the function and data fields of a modbus rtu telegram 66
- Conversion factor 67
- Examples 67
- Ind index 67
- Notice 67
- Parameter values 67
- Read coil status 01 hex 67
- Storage of data 67
- Text blocks 67
- Coil addresses start at 0 that is coil 17 is addressed as 16 68
- Description this function forces each coil in a sequence of coils to either on or off when broadcasting the function forces the same coil references in all attached slaves 68
- Description this function forces the coil to either on or off when broadcast the function forces the same coil references in all attached slaves 68
- Description this function reads the contents of holding registers in the slave 68
- Example read parameter 3 03 maximum reference register 03030 68
- Force write multiple coils 0f hex 68
- Force write single coil 05 hex 68
- Midi drive fc 280 68
- Notice 68
- Query the query telegram specifies the coil 65 parameter write control to be forced coil addresses start at 0 that is coil 65 is addressed as 64 force data 00 00 hex off or ff 00 hex on 68
- Query the query telegram specifies the coils 17 32 speed setpoint to be forced 68
- Query the query telegram specifies the starting register and quantity of registers to be read register addresses start at 0 that is registers 1 4 are addressed as 0 3 68
- Read holding registers 03 hex 68
- Response the normal response is an echo of the query returned after the coil state has been forced 68
- Response the normal response returns the slave address function code starting address and quantity of coils forced 68
- Rs485 installation and set vl 68
- Byte contains the high order bits and the 69
- Contains the low order bits 69
- Description this function presets a value into a single holding register 69
- Description this function presets values into a sequence of holding registers 69
- Example hex 000088b8 35 00 35 hz 69
- Example write to parameter 1 00 configuration mode register 1000 69
- Preset multiple registers 10 hex 69
- Preset single register 06 hex 69
- Query the query telegram specifies the register reference to be preset register addresses start at 0 that is register 1 is addressed as 0 69
- Query the query telegram specifies the register references to be preset register addresses start at 0 that is register 1 is addressed as 0 example of a request to preset 2 registers set parameter 1 24 motor current to 738 7 8 a 69
- Response the normal response is an echo of the query returned after the register contents have been passed 69
- Response the normal response returns the slave address function code starting address and quantity of registers preset 69
- Response the register data in the response telegram is packed as 2 bytes per register with the binary contents right justified within each byte for each register the 69
- Rs485 installation and set design guide 69
- 8 10 protocol fc profile 70
- Control word according to fc profile 70
- Danfoss fc control profile 70
- Notice 70
- Status word according to fc profile 71
- Bus speed reference value 73
- Illustration 5 5 actual output frequency mav 73
- Illustration 5 6 reference and mav 73
- Mg07b102 danfoss a s 03 2016 all rights reserved 71 73
- Rs485 installation and set design guide 73
- Speed reference value is transmitted to the frequency converter in a relative value in the value is transmitted in the form of a 16 bit word the integer value 16384 4000 hex corresponds to 100 negative figures are formatted using 2 s complement the actual output frequency mav is scaled in the same way as the bus reference 73
- The reference and mav are scaled as follows 73
- Midi drive fc 280 74
- Ordering numbers options and accessories 74
- Type code and selection 74
- Type code and selection vl 74
- Danfoss offers a wide variety of different resistors that are specially designed for our frequency converters see chapter 2 control with brake function for the dimensioning of brake resistors this section lists the ordering numbers for the brake resistors 75
- Ordering numbers brake resistors 75
- Ordering numbers brake resistors 10 75
- Type code and selection design guide 75
- Midi drive fc 280 76
- Ordering numbers brake resistors 40 76
- Type code and selection vl 76
- Power dependent specifications 77
- Specifications 77
- Specifications design guide 77
- Mains supply 3 phase 78
- Mains supply l1 l2 l3 supply terminals l1 l2 l3 78
- Maximum imbalance temporary between mains phases 3 of rated supply voltage 78
- Midi drive fc 280 78
- Specifications vl 78
- Supply frequency 50 60 hz 5 78
- Supply voltage 380 480 v 15 25 78
- Switching on input supply l1 l2 l3 power ups 11 22 kw maximum 1 time minute 78
- Switching on input supply l1 l2 l3 power ups 7 kw maximum 2 times minute 78
- The frequency converter can run at 25 input voltage with reduced performance the maximum output power of the frequency converter is 75 if input voltage is 25 and 85 if input voltage is 15 full torque cannot be expected at mains voltage lower than 10 below the lowest rated supply voltage of the frequency converter 78
- The unit is suitable for use on a circuit capable of delivering less than 5000 rms symmetrical amperes 480 v maximum 78
- True power factor λ 0 nominal at rated load 78
- Ambient conditions 79
- Motor output and motor data 79
- Cable specifications 80
- Control input output and control data 80
- High altitude 81
- Notice 81
- Caution 83
- Notice 83
- Efficiency 84
- Acoustic noise 85
- Affect the service life of the motor if the peak voltage is too high motors without phase coil insulation are affected the longer the motor cable the higher the rise time and peak voltage 85
- Dc intermediate circuit coils 85
- Du dt conditions 85
- In the motor voltage before it stabilizes itself at a level depending on the voltage in the dc link the rise time and the peak voltage 85
- Inductance 85
- Integral fan 85
- Rfi filter choke 85
- Specifications design guide 85
- Switching of the igbts cause peak voltage on the motor terminals the fc 280 complies with iec 60034 25 regarding motors designed to be controlled by frequency converters the fc 280 also complies with iec 60034 17 regarding norm motors controlled by frequency converters the following du dt data are measured at the motor terminal side 85
- The acoustic noise from the frequency converter comes from 3 sources 85
- The cross section of the motor cable 85
- The length of the motor cable 85
- The motor cable type 85
- The natural induction causes an overshoot 85
- The typical values measured at a distance of 1 m 3 ft from the unit 85
- When a transistor in the frequency converter bridge switches the voltage across the motor increases by a du dt ratio depending on the following factors 85
- Whether the motor cable is shielded or not 85
- Air pressure for installation at altitudes above 1000 m 3281 ft 86
- Ambient temperature above 45 c 113 f for details see illustration 7 illustration 7 illustration 7 illustration 7 and illustration 7 86
- Manual derating 86
- Manual derating must be considered for 86
- Midi drive fc 280 86
- Motor speed at continuous operation at low rpm in constant torque applications 86
- Special conditions 86
- Specifications vl 86
- Under some special conditions where the operation of the frequency converter is challenged consider derating in some conditions derating must be done manually in other conditions the frequency converter automatically performs a degree of derating when necessary derating is done to ensure the performance at critical stages where the alternative could be a trip 86
- As a response to a critical level the frequency converter adjusts the switching frequency 87
- Automatic derating 87
- Critical high temperature on the heat sink 87
- High motor load 87
- Low motor speed 87
- Protection signals overvoltage undervoltage overcurrent ground fault and short circuit are triggered 87
- Specifications design guide 87
- The frequency converter constantly checks for critical levels 87
- Index design guide 91
- Mg07b102 92
- R0142 mg07b102 03 2016 92
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- Danfoss VLT Midi Drive FC-280P1K5 Брошюра
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