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Fault Procedure
Use the Reset (Reset/ Coasting stop inverse)
input to reset any fault.
The "On" LED (Green), when illuminated, indicates
that the Control supply is on.
The "Bus" LED (Green), when illuminated, indicates
that AS-i bus communication is OK.
Reading the "Alarm" LED
No.
of
Trip Condition
flashes
One (1)
Power Loss or Shorted SCR
Two (2)
Thermal Overload
Three (3)
Motor Thermistor Trip
Four (4)
Phase Loss
Five (5)
Welded Direction Change Relay
MG.90.F2.22 - VLT is a registered Danfoss trademark
Decentral Solutions
The "Alarm" LED (Red), when illuminated, indicates
that the DMS is in the alarm/ trip state.
The number of Alarm LED flashes indicates the fault/
trip condition. The Alarm LED will flash a certain
number of times, depending on the nature of fault.
Cause & Action
Check supply voltages. This is a pre-start check.
Check FLC setting.
Check the Motor Trip class setting.
Remove the cause of the overload and let the
motor cool before restarting.
Identify and correct the cause of motor
overheating.
If no thermistors are connected to the DMS,
ensure there is a closed circuit across the motor
thermistor input (terminals 31A & 31B).
Check supply for missing phase. This is active
anytime during start.
Replace unit.
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