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Danfoss MCD 201-075-T6-xxx [10/24] N frequently asked questions
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MCD 200 Design Guide
■ Frequently Asked Questions
• What is the minimum allowable motor current
when using an MCD 201 open loop soft starter?
There is no minimum current whe n using an
MCD 201 open loop soft starter
• What is the minimum allowable motor
current when using an MCD 202 closed
loop soft starter?
The minimum "Motor FLC" se tting is 5 0% of
the MCD 202 nameplate rating. All the motor
protections are based on this setting.
It is possible to operate an MCD 202 with a small kW
motor, for testing purposes. In this case, the m otor
will effectively start DOL, and the MCD 202 will not
protect the motor. T he starter will not trip, because
there is no undercurrent protection on MCD 202.
• What type of motor protection does
theMCD202have?
The MCD 202 has built-in motor overload
protection of the electronic "thermal m odel" type.
The motor current is continuously monitored
and the expected temperature is calculated
based on this monitored current.
The rate of rise of the calculated motor temperature
is determined by the Motor Trip Class setting.
The lower this setting, the faster the rate of ris e
of calc u lated motor temperature. An Overcurrent
trip (x 2 Ready LED flashes) will occur when the
calculated temperature reaches 105%. The setting
of the Motor Trip Class pot is similar to a motor trip
class setting on a standard thermal overload relay.
An exter nal motor protection device is not required
when using an MCD 202 soft starter. MCD 202 is
certified to c onform to the IEC60947-4-2 standard
for electronic soft starters. The reliability of the
motor protection feature is part of this standard.
• How do I select an MCD 200 soft starter
for duty cycles different from those listed
in the standard ratings table?
The WinStart software package is available for
selecting s oft starters for different duty cycles.
• Which MCD 200 models carry the UL mark?
All T6 m odels carry the UL mark.
• What are the MCD 200 operational ratings
before maintenance may be required?
The operational ratings for MCD 200 are
size-dependent, and are due to the capability
of the internal bypass relays:
Size 1 & 2 (7.5 ~ 55 kW): 1,000,000 operations
Size 3 (75 ~ 110 kW): 100,000 operations.
• When would I use a line contactor?
A line contactor may be compulsory for a specific
installation. This requirement will be the same
whether using a two-phase controlled soft
starter or a three-phase controlled soft starter
(see Product Note for more detail).
• How do I size the fuses of the motor
branch circuit (Type 1) when using an
MCD 200 soft starter?
For "Current Limit" s ettings ≤ 350% and start times
≤ 15 seconds, the nominal rating of standard line
supply fuses (gG) should be 1.75 x Motor FLC.
If motor rated fuses (gM) are being u s ed, their
nominal rating should be 1.5 x M otor FLC.
For "Current Limit" settings > 350% and start
times > 15 seconds, the nominal rating of standard
line supply fuses (gG ) should be 2 x Motor FLC.
If motor rated fuses (gM) are being u s ed, their
nominal rating should be 1.75 x Motor FLC.
• When would I use semiconductor fuses?
Either when specified for an installation, or when
Type 2 c oordination is required.
The MCD 200 is internally bypassed, so the SCRs
are in use only during starting and soft stopping.
• What is the current consumption of the
MCD 200 control supply?
The steady state consumption of the control supply
is 100 mA maximum, for both CV1 and CV3 models.
However, the short time inrush current at control
supply "switch-on" can be as high as 10 A for
CV3 models, and 2 A for CV1 models (due
to the SMPS power supply).
• How can the MCD 202 programmable
output relay be used?
The programmable output relay provides
an N/O contact, which can be used for a
"Trip" or "Run" output.
Trip output:
The relay operates when the MCD 202 trips
on any fault. This can be used to operate a
shunt-trip mechanism of an upstream c ircuit
breaker to isolate the motor branch circuit. It
couldalsobeusedtosignalMCD202"Trip"
status to an automation system.
Run output:
The relay operates on completion of start ramp. This
can be used to operate a contactor for po wer factor
correction capacitors. It could also be used to signal
MCD 202 "Run" status to an automation system.
• Is the MCD 202 suitable for flying
start application?
Yes. There is a built-in 2 s econd delay between
the end of one stop and the beginning of the next
start. This delay allows the motor flux to decay,
eliminating any chance of the MCD 202 tripping on
Power Circuit fault (x 1 Ready LED flash) due to
detection of motor bac k EMF when the start signal
is applied. The major effect of a flying start is on
MG.17.C2.02 - VLT is a registered Danfoss trademark
10
Содержание
- Accessorie 1
- Contents 1
- Mcd 200 design guide 1
- Mcd 200 series overvie 1
- Mcd 201 1
- Mcd 202 1
- Soft start application guid 1
- Mcd 200 design guide 2
- N avoiding soft starter damage 2
- N high voltage warning 2
- N safety regulations 2
- N symbols used in this manual 2
- N warning against unintended start 2
- N warnings 2
- Warnings 2
- Mcd 200 design guide 3
- Mcd 200 series overview 3
- N description 3
- N mcd 200 series overview 3
- N ordering type code 3
- Mcd 200 design guide 4
- N ratings 4
- Control inputs 5
- Control supply a1 a2 a3 5
- Emc emission 5
- Emc immunity 5
- Environmental 5
- Mains supply l1 l2 l3 5
- Mcd 200 design guide 5
- Mcd 200 series overview 5
- N general technical data 5
- Relay outputs 5
- Short circuit 5
- This product has been designed for class a equipment use of the product in domestic environments may cause radio interference in which case the user may be required to employ additional mitigation methods 5
- Heat dissipation 6
- Mcd 200 design guide 6
- Standards approvals 6
- Mcd 200 007 mcd 200 030 30 mm yes 7
- Mcd 200 037 mcd 200 110 not available yes 7
- Mcd 200 design guide 7
- Mcd 200 din rail foot mounting 7
- Mcd 200 series overview 7
- N dimensions and weights 7
- N mechanical installation 7
- Mcd 200 design guide 8
- Mcd 201 037 mcd 201 055 4 kg 8 lb mcd 202 037 mcd 202 055 4 kg 9 lb 8
- Mcd 201 075 mcd 201 110 6 kg 13 lb mcd 202 075 mcd 202 110 6 kg 15 lb 8
- Mg 7 c2 2 vlt is a registered danfoss trademark 8
- Cable size 9
- Mcd 200 design guide 9
- Mcd 200 series overview 9
- Mg 7 c2 2 vlt is a registered danfoss trademark 9
- N cable size 9
- N semiconductor fuses 9
- Semiconductor fuses semiconductor fuses may be used with the mcd 200 soft starters use of semiconductor fuses will provide type 2 coordination and reduce the potential of scr damage due to transient overload currents and short circuits mcd 200 soft starters have been tested to achieve type 2 coordination with semiconductor fuses 9
- T rating than the scr and can carry start current for the full starting duration 9
- The following table provides a list of suitable ferraz and bussman fuses if selecting alternate brands ensure the selected fuse has a lower total clearing 9
- ºc wire use copper conductors only 9
- Mcd 200 design guide 10
- N frequently asked questions 10
- Mcd 200 design guide 11
- Mcd 200 series overview 11
- Mcd 200 design guide 12
- Mcd 201 12
- N electrical schematic 12
- N mcd 201 12
- N mcd 201 range 12
- Mcd 200 design guide 13
- Mcd 201 13
- N control circuits 13
- N functionality 13
- Mcd 200 design guide 14
- N fault finding 14
- N indication 14
- A 30 vdc resistive 2 a 400 vac ac11 15
- Also resets the mcd 202 15
- Auxiliary relay function trip see parameter 8 15
- Control circuits 2 wire control 15
- Electrical schematic example 1 mcd 202 installed with system protection circuit breaker complete with shunt trip device 15
- Example 2 mcd 202 installed with system protection circuit breaker and line contactor 15
- Main contactor 15
- Mcd 200 design guide 15
- Mcd 202 15
- Mcd 202 range mcd 202 soft starters provide current limit control tvr soft stop and include a range of motor protection features 15
- N control circuits 15
- N electrical schematic 15
- N mcd 202 15
- N mcd 202 range 15
- Mcd 200 design guide 16
- N functionality 16
- Mcd 200 design guide 17
- Mcd 202 17
- Mcd 200 design guide 18
- N fault finding 18
- N indication 18
- N motor thermistor protection 18
- 20 ma output motor current 19
- Accessories 19
- Feature mcd 201 19
- Mcd 200 design guide 19
- Mcd 202 19
- Mcd 3000 19
- Motor current display 19
- Motor temperature display 19
- N accessories 19
- N mcd 200 as i module 19
- N mcd 200 devicenet module 19
- N mcd 200 modbus module 19
- N mcd 200 profibus module 19
- N mcd 200 remote operator 19
- N mcd pc software 19
- N overview 19
- Pushbutton control start stop reset 19
- Starter status leds starting running tripped 19
- Trip code display 19
- Mcd 200 design guide 20
- Lrc motor locked rotor current 21
- Lrt motor locked rotor torque 21
- Mcd 200 design guide 21
- N application guide 21
- N reduced voltage starting 21
- N soft start application guide 21
- Soft start application guide 21
- Start current 21
- Start torque 21
- Mcd 200 design guide 22
- N types of soft start control 22
- N understanding soft starter ratings 22
- Ac53b for soft starters used with bypass contactors for example the following ac53b code describes a soft starter which when bypassed is capable of supplying 145 a run current and a start current of 4 x flc for 30 seconds with a minimum of 570 seconds between the end of one start and the commencement of the next 23
- In summary a soft starter has many current ratings these current ratings are dependent on the start current and operational performance required by the application 23
- Mcd 200 design guide 23
- Model selection 23
- N model selection 23
- Nb the above start current requirements are typical and appropriate in most circumstances however start torque requirements and performance of motors and machines does vary please contact danfoss if the application requires duties other than listed in this manual 23
- Nb to fully understand the model selection procedures it is important to have a good knowledge of the fundamental principles of soft starter ratings see understanding soft starter ratings 23
- Soft start application guide 23
- Starter current rating maximum flc rating of the motor to be connected to the soft starter given the operating parameters specified by the remaining items in the ac53a code start current the maximum start current that will be drawn during start start time the time taken for the motor to accelerate on load duty cycle the percentage of each operating cycle that the soft starter will run starts per hour the number of operating cycles per hour 23
- To compare the current rating of different soft starters it is important to ensure that operating parameters are identical 23
- To select the correct mcd 200 model 1 determine whether the application requires a normal duty or a heavy duty rating the table below can be used as a guide 2 see the tables in ratings and select an mcd 200 model with an flc rating greater than that of the motor 23
- Application benefits 24
- Centrifuges 24
- Compressors 24
- Conveyor belts 24
- Mcd 200 design guide 24
- Mixers 24
- N power factor correction 24
- N typical applications 24
- Ski lifts 24
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