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ABB ACH550-01-03A3-4+B055 [15/62] Actual value scaling
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15
Feedback from the Drive – EFB
Actual Value Scaling
The scaling of actual values can be protocol dependent. In general, for Actual
Values, scale the feedback integer using the parameter’s resolution. (See
"Parameter Descriptions" section in ACH550 User’s Manual for parameter
resolutions.) For example:
Where parameters are in percent, the "Parameter Descriptions" section specifies
what parameter corresponds to 100%. In such cases, to convert from percent to
engineering units, multiply by the value of the parameter that defines 100% and
divide by 100%. For example:
1. Assuming, for the sake of this example, that the Actual Value uses parameter 9908 MOT NOM SPEED
as the 100% reference, and that 9908 = 1500 rpm.
2. Assuming, for the sake of this example, that the Actual Value uses parameter 9907
MOT NOM FREQ
as the 100% reference, and that 9907 = 500 Hz.
Although Actual Value scaling could differ from the above for the N2 and FLN
protocols, it currently does not. To confirm, see the following sections, as
appropriate:
• "N2 Analog Input Objects" in the "N2 Protocol Technical Data" section.
• "Scaling Drive Feedback Values" in the "FLN Protocol Technical Data" section.
Feedback
Integer
Parameter
Resolution
(Feedback Integer) * (Parameter Resolution) = Scaled Value
1 0.1 mA 1 * 0.1 mA = 0.1 mA
10 0.1% 10 * 0.1% = 1%
Feedback
Integer
Parameter
Resolution
Value of the
Parameter that
defines 100%
(Feedback Integer) * (Parameter Resolution) *
(Value of 100% Ref.) / 100% = Scaled Value
10 0.1% 1500 rpm
1
10 * 0.1% * 1500 RPM / 100% = 15 rpm
100 0.1% 500 Hz
2
100 * 0.1% * 500 Hz / 100% = 50 Hz
Содержание
- Low voltage ac drives 1
- Ach550 drive manuals 2
- Table of contents 3
- Embedded fieldbus 4
- Overview 4
- Control interface 5
- In general the basic control interface between the fieldbus system and the drive consists of 5
- Network planning should address the following questions 5
- Note the words output and input are used as seen from the fieldbus controller point of view for example an output describes data flow from the fieldbus controller to the drive and appears as an input from the drive point of view 5
- Planning 5
- What control information must be sent down to the drives 5
- What feedback information must be sent from the drives to the controlling system 5
- What types and quantities of devices must be connected to the network 5
- Are for rs485 communications 6
- As always the grounding wires should not form any closed loops and all the devices should be earthed to a common ground 6
- Communication set up efb below activate drive control functions efb on page 9 the appropriate efb protocol specific technical data for example modbus protocol technical data on page 19 6
- Connect the rs485 link in a daisy chained bus without dropout lines 6
- Connect the shield at each end of the cable to a drive on one end connect the shield to terminal 28 and on the other end connect to terminal 32 do not connect the incoming and outgoing cable shields to the same terminals as that would make the shielding continuous 6
- Do not directly ground the rs485 network at any point ground all devices on the network using their corresponding earthing terminals 6
- Drive terminals 2 6
- For configuration information see the following 6
- Mechanical and electrical installation efb 6
- To reduce noise on the network terminate the rs485 network using 120 ω resistors at both ends of the network use the dip switch to connect or disconnect the termination resistors see following diagram and table 6
- Use belden 9842 or equivalent belden 9842 is a dual twisted shielded pair cable with a wave impedance of 120 ω 6
- Use one of the wires in the other pair for the logical ground terminal 31 leaving one wire unused 6
- Use one of these twisted shielded pairs for the rs485 link use this pair to connect all a terminals together and all b terminals together 6
- Warning connections should be made only while the drive is disconnected from the power source 6
- Communication set up efb 7
- Note if you cannot see the desired selection on the panel your drive does not have that protocol software in the application memory 7
- Serial communication configuration 7
- Serial communication selection 7
- Setting 9802 automatically sets the appropriate default values in parameters that define the communication process these parameters and descriptions are defined below in particular note that the station id may require adjustment 7
- To activate the serial communication set parameter 9802 7
- Communication set up efb 8
- Note after any changes to the communication settings protocol must be reactivated by either cycling the drive power or by clearing and then restoring the station id 5302 8
- Activate drive control functions efb 9
- Controlling the drive 9
- Define as a fieldbus input any drive data required for control 9
- Define as a fieldbus output any control data required by the drive 9
- Drive parameter values set as defined below 9
- Fieldbus control of various drive functions requires configuration to 9
- Fieldbus controller supplied command s in the appropriate location the location is defined by the protocol reference which is protocol dependent 9
- Start stop direction control 9
- Tell the drive to accept fieldbus control of the function 9
- The following sections describe at a general level the configuration required for each control function for the protocol specific details see the document supplied with the fba module 9
- Using the fieldbus for start stop direction control of the drive requires 9
- Activate drive control functions efb 10
- Can be scaled see the following as appropriate 10
- Drive parameter values set as defined below 10
- Fieldbus controller supplied reference word s in the appropriate location the location is defined by the protocol reference which is protocol dependent 10
- Input reference select 10
- Modbus register 40002 in the modbus protocol technical data section 10
- N2 analog output objects in the n2 protocol technical data section 10
- Reference scaling 10
- Reference scaling in the abb control profiles technical data section 10
- The slope of points 60 and 61 in the fln protocol technical data section 10
- Using the fieldbus to provide input references to the drive requires 10
- Where required 10
- Activate drive control functions efb 11
- Drive parameter values set as defined below 11
- Fieldbus controller supplied reference word s in the appropriate location the location is defined by the protocol reference which is protocol dependent 11
- Miscellaneous drive control 11
- Using the fieldbus for miscellaneous drive control requires 11
- Activate drive control functions efb 12
- And 1402 12
- Drive parameter values set as defined below 12
- Fieldbus controller supplied reference word s in the appropriate location the location is defined by the protocol reference which is protocol dependent 12
- For example to control relays 1 and 2 using serial communication set parameters 1401 12
- Note relay status feedback occurs without configuration as defined below 12
- Relay output control 12
- Then for example using n2 12
- To turn both relay 1 and 2 on force objects b07 and b08 on 12
- To turn relay 1 on force object b07 to on 12
- To turn relay 2 on force object b08 to on 12
- Using the fieldbus for relay output control requires 12
- Activate drive control functions efb 13
- Analog output control 13
- Communication fault 13
- Drive parameter values set as defined below 13
- Fieldbus controller supplied reference word s in the appropriate location the location is defined by the protocol reference which is protocol dependent 13
- Pid control setpoint source 13
- Use the following settings to select the fieldbus as the setpoint source for pid loops 13
- Using the fieldbus for analog output control requires 13
- When using fieldbus control specify the drive s action if serial communication is lost 13
- Feedback from the drive efb 14
- Inputs to the controller drive outputs have pre defined meanings established by the protocol this feedback does not require drive configuration the following table lists a sample of feedback data for a complete listing see input word point object listings in the technical data for the appropriate protocol starting on page 19 14
- Mailbox read write 14
- Note with modbus any parameter can be accessed using the format 4 followed by the parameter number 14
- Pre defined feedback 14
- The ach550 provides a mailbox function to access parameters that have not been pre defined by the protocol using mailbox any drive parameter can be identified and read mailbox can also be used to adjust parameter settings by writing a value to any parameter identified the following table describes the use of this function 14
- Actual value scaling 15
- Although actual value scaling could differ from the above for the n2 and fln protocols it currently does not to confirm see the following sections as appropriate 15
- Feedback from the drive efb 15
- N2 analog input objects in the n2 protocol technical data section 15
- Scaling drive feedback values in the fln protocol technical data section 15
- The scaling of actual values can be protocol dependent in general for actual values scale the feedback integer using the parameter s resolution see parameter descriptions section in ach550 user s manual for parameter resolutions for example 15
- Where parameters are in percent the parameter descriptions section specifies what parameter corresponds to 100 in such cases to convert from percent to engineering units multiply by the value of the parameter that defines 100 and divide by 100 for example 15
- Diagnostic situations 16
- Diagnostics efb 16
- Fault queue for drive diagnostics 16
- Serial communication diagnostics 16
- Feature summary 19
- Modbus is a serial asynchronous protocol transactions are half duplex featuring a single master controlling one or more slaves while rs232 can be used for point to point communication between a single master and a single slave a more common implementation features a multi drop rs485 network with a single master controlling multiple slaves the ach550 features rs485 for its modbus physical interface 19
- Modbus protocol technical data 19
- Overview 19
- The following modbus function codes are supported by the ach550 19
- The modbus protocol was introduced by modicon inc for use in control environments featuring modicon programmable controllers due to its ease of use and implementation this common plc language was quickly adopted as a de facto standard for integration of a wide variety of master controllers and slave devices 19
- The modbus specification defines two distinct transmission modes ascii and rtu the ach550 supports rtu only 19
- Modbus addressing 20
- Additional relay outputs are added sequentially 21
- For the 0xxxx registers 21
- Forcing is allowed by user configuration of the drive for fieldbus control 21
- Modbus protocol technical data 21
- Status is always readable 21
- The following table summarizes the 0xxxx reference set 21
- Bit wise map of the 22
- Discrete hardware inputs numbered sequentially beginning with input 33 22
- Modbus protocol technical data 22
- Selected using parameter 5305 22
- The ach550 supports the following modbus function codes for coils 22
- The first 32 inputs are reserved for this purpose 22
- The following table summarizes the 1xxxx reference set 22
- Xxxx mapping modbus discrete inputs the drive maps the following information to the 1xxxx modbus set called modbus discrete inputs 22
- 40001 40099 map to drive control and actual values these registers are described in the table below 23
- 40101 49999 map to drive parameters 0101 9999 register addresses that do not correspond to drive parameters are invalid if there is an attempt to read or write outside the parameter addresses the modbus interface returns an exception code to the controller 23
- Additional discrete inputs are added sequentially 23
- Any user defined analog inputs 23
- For the 1xxxx registers 23
- Modbus protocol technical data 23
- The ach550 supports the following modbus function codes for 3xxxx registers 23
- The ach550 supports the following modbus function codes for discrete inputs 23
- The following table summarizes the input registers 23
- Xxxx mapping modbus inputs the drive maps the following information to the 3xxxx modbus addresses called modbus input registers 23
- Xxxx register mapping the drive maps its parameters and other data to the 4xxxx holding registers as follows 23
- Modbus protocol technical data 24
- The following table summarizes the 4xxxx drive control registers 40001 40099 for 4xxxx registers above 40099 see the drive parameter list e g 40102 is parameter 0102 24
- Except where restricted by the drive all parameters are available for both reading and writing the parameter writes are verified for the correct value and for a valid register addresses 25
- For the modbus protocol drive parameters in group 53 report the parameter mapping to 4xxxx registers 25
- Modbus protocol technical data 25
- Note parameter writes through standard modbus are always volatile i e modified values are not automatically stored to permanent memory use parameter 1607 25
- The ach550 supports the following modbus function codes for 4xxxx registers 25
- To save all altered values 25
- 16 bit words containing a sign bit and a 15 bit integer 26
- Actual values 26
- And are 26
- Exception codes 26
- Exception codes are serial communication responses from the drive the ach550 supports the standard modbus exception codes defined below 26
- Modbus protocol technical data 26
- Read only values containing information on the operation of the drive 26
- Scaled as described earlier in actual value scaling 26
- Specified using parameters 5310 5317 26
- The contents of the register addresses 40005 40012 are 26
- When negative values written as the two s complement of the corresponding positive value 26
- Abb control profiles technical data 27
- Overview 27
- Abb control profiles technical data 28
- Abb drives profile 28
- Content for the abb drives profile 28
- The following table and the state diagram later in this sub section describe the 28
- Abb control profiles technical data 29
- Content for the dcu profile 29
- Dcu profile 29
- The following tables describe the 29
- Abb control profiles technical data 30
- Is status information sent by the drive to the master station 30
- Status word 30
- The contents of the 30
- Abb control profiles technical data 31
- Abb drives profile 31
- The following table and the state diagram later in this sub section describe the status word content for the abb drives profile 31
- Abb control profiles technical data 32
- Content for the dcu profile 32
- Dcu profile 32
- The following tables describe the 32
- Abb control profiles technical data 33
- Abb control profiles technical data 34
- Abb drives profile 34
- First the requirements for using the 34
- Implementation of the abb drives profile uses the control word to start the drive 34
- Must be met see above 34
- State diagram 34
- State is reached meaning that the drive is running and follows the given reference see table below 34
- To illustrate the operation of the state diagram the following example 34
- To step through the state machine states until the 34
- Use the 34
- When the power is first connected the state of the drive is not ready to switch on see dotted lined path in the state diagram below 34
- Abb control profiles technical data 35
- Cw and 35
- Sw bits for the abb drives profile 35
- The state diagram below describes the start stop function of 35
- Abb control profiles technical data 36
- Abb drives and dcu profiles 36
- And 1107 36
- Has no effect on the scaling of references 36
- Is set to 36
- Note the setting of parameter 1104 36
- Or 1106 36
- Reference scaling 36
- Scaling for the abb drives profile 36
- The following table describes 36
- The reference is scaled as follows 36
- When parameter 1103 36
- Abb control profiles technical data 37
- Abb control profiles technical data 38
- Note fieldbus references are bipolar that is they can be positive or negative 38
- Reference handling 38
- The following diagrams illustrate how group 10 parameters and the sign of the fieldbus reference interact to produce 38
- Use group 10 parameters to configure for control of rotation direction for each control location 38
- Values 38
- N2 protocol technical data 39
- Overview 39
- Drive device type 41
- For the metasys and metasys companion products the device type for the ach550 drive is vnd 41
- N2 analog input objects 41
- N2 protocol technical data 41
- On one n2 fieldbus segment there can be up to 32 nodes while integrating ach550 drives with johnson controls metasys 41
- On the n2 fieldbus each ach550 drive can be accessed by the full complement of metasys fms features including change of state cos monitoring alarm notification scheduling trend and totalization 41
- The following diagram shows the drives integration to the johnson controls metasys companion system 41
- The following table lists the n2 analog input objects defined for the ach550 drive 41
- N2 binary input objects 42
- N2 protocol technical data 42
- The following table lists the n2 binary input objects defined for the ach550 drive 42
- N2 analog output objects 43
- N2 protocol technical data 43
- The following table lists the n2 analog output objects defined for the ach550 drive 43
- Abb drives ach 550 variable frequency drive csmodel ach_550 vnd 44
- Aititle analog_inputs bititle binary_inputs aotitle analog_outputs botitle binary_outputs 44
- Below is the ach550 ddl file listing 44
- Ddl file for ncu 44
- N2 binary output objects 44
- N2 protocol technical data 44
- The following table lists the n2 binary output objects defined for the ach550 drive 44
- The listing below is the data definition language ddl file for ach550 drives used with the network control units 44
- This listing is useful when defining drive i o objects to the network controller units 44
- Abb ach550 47
- Fln protocol technical data 47
- Overview 47
- Reports 47
- Startup 47
- Supported features 47
- The ach550 provides seven pre defined reports using a report request generated from the fln fieldbus controller select one of the following sets of points by providing views of selected points these reports are often easier to work with than views of the full point database 47
- The ach550 supports all required fln features 47
- The fln fieldbus connection to the ach550 drives is based on an industry standard rs 485 physical interface the fln floor level network fieldbus protocol is a serial communication protocol used by the siemens apogee system the ach550 interface is specified in siemens application 2734 47
- Drive i o 48
- Fln protocol technical data 48
- Overview 48
- Drive config 49
- Fln protocol technical data 49
- External pid 50
- Feedback values are provided with units of percent where 0 and 100 correspond to the range of the sensor being used to measure the control variable these points have default units in hz if other units are required 50
- Fln protocol technical data 50
- Process pid 50
- Scaling drive feedback values 50
- The new intercept equals the lowest value of the desired range 50
- Unbundle these points with appropriate slopes and intercepts 50
- Calculate the new slope as follows 51
- Example you are controlling water temperature from a cooling tower using the ach550 to control a fan the temperature sensor has a range of 30 to 250 degrees fahrenheit 51
- Fln protocol technical data 51
- Loop gains 51
- Prc pid gain point 50 and prc pid itim point 51 are pid parameters similar to the p and i gains in the apogee tecs because the abb pi loop and the siemens loop are structured differently there is no a one to one correspondence between the gains the following formulas allow translation from abb gains to siemens gains and vice versa 51
- To convert from abb pi gains to siemens p and i gains 51
- To convert from siemens p and i gains to abb pi gains 51
- To unbundle the feedback prc pid fbck for monitoring in degrees fahrenheit 51
- To unbundle the set point input ref 2 for commanding in degrees fahrenheit where 0 60 hz is equal to 30 25 51
- Fln protocol technical data 52
- Point database 52
- The following table lists the point database for fln ach550 application 2734 52
- Fln protocol technical data 53
- Fln protocol technical data 54
- Detailed point descriptions 55
- Fln protocol technical data 55
- Fln protocol technical data 56
- Fln protocol technical data 57
- Fln protocol technical data 58
- Fln protocol technical data 59
- Fln protocol technical data 60
- Afe68320658 rev d en effective 31 5 007 2007 abb oy all rights reserved 62
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