MCD 200 Design Guide
MG.17.C3.02 – VLT is a registered Danfoss trademark 17
MCD 202
In this case make the following settings:
• Set Parameter 2 Current Limit so that the
motor can accelerate to full speed when fully
loaded.
• Set Parameter 3 Current Ramp so that:
- the initial start current allows the motor to
accelerate when unloaded
- the ramp time provides the desired starting
performance
2. On generator set supplies where a gradual
increase in current is required to allow greater
time for the generator set to respond to the
increased loading.
In this case make the following settings:
• Set Parameter 2 Current Limit as desired.
• Set Parameter 3 Current Ramp so that:
- the Initial Start Current is lower than the
Current Limit
- the ramp time achieves the desired gradual
draw of start current
4 Soft Stop Ramp Time
Value:
2 - 20 seconds, No Soft Stop
✭ No Soft Stop
Function:
Sets the time of the soft stop voltage ramp. The soft
stop function extends motor deceleration time by
ramping down voltage supplied to the motor when a
stop is initiated.
Description of choice:
Set the ramp time to optimise stopping characteristics
for the load.
5 Motor Trip Class
Value:
2 - 20, Off
✭ 10
Function:
Calibrates the MCD 202 motor thermal model
according to the desired motor trip class.
Description of choice:
6 Excess Start Time Protection
Value:
2 - 20 seconds, Off
✭ 10 seconds
Function:
Sets the maximum allowable start time.
Description of choice:
Set for a period slightly longer than the normal motor
starting time. The MCD 202 will then trip if the start
time exceeds normal.
This provides early indication that the application
conditions have changed or that the motor has stalled.
It can also protect the soft starter from being operated
outside its rated start capability.
NB!:
Ensure the Excess Start Time protection
setting is within the MCD 202 rated capability.
7 Phase Rotation Protection
Value:
ANY, FWD
✭ ANY
ANY = Forward & Reverse rotation permitted
FWD = Forward Rotation Only
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