Danfoss VLT MCD 600 Operating Manual page 124

VLT® Soft Starter MCD 600
Operating Guide
Troubleshooting
• Check for faulty SCRs and internal wiring faults.
• There are no parameters related to this trip message.
11.2.11 FLC Too High
The soft starter can be used on a motor with a higher full load current (FLC) if it is connected inside delta, or if a non-bypassed soft
starter is installed with an external bypass contactor.
Cause
If the soft starter is connected to the motor using inside delta configuration, the soft starter may not be detecting the connection
correctly.
If the soft starter is a non-bypassed model and was previously used with an external bypass contactor and parameter 20-7 External
Bypass has now been set to Disable, the FLC may be above the maximum non-bypassed rating.
Troubleshooting
•
Set parameter 20-6 Motor Connection to the connection used for the motor (in-line or inside delta). If the failure remains, contact
the local supplier for advice.
• Check that the non-bypassed rating of the soft starter is suitable for the motor, then set parameter 1-2 Motor Full Load Current to
match the motor FLC.
• Check also the following parameters:
- Parameter 1-2 Motor Full Load Current.
-
Parameter 20-6 Motor Connection.
-
Parameter 20-7 External Bypass.
11.2.12 Flow Sensor
Cause
The smart card has detected a fault with the flow sensor.
Troubleshooting
• Check the following parameters:
-
Parameter 30-5 Flow Sensor Type.
-
Parameter 36-2 Flow Sensor.
11.2.13 Flow Switch
Cause
The flow switch sensor (smart card terminals C23, C24) has closed.
Troubleshooting
• Check the following parameters:
- Parameter 30-5 Flow Sensor Type.
- Parameter 36-8 Flow Switch.
11.2.14 Frequency
Cause
This trip is not adjustable. The mains frequency is outside of the specified range. Check for other equipment in the area that could
be affecting the mains supply, particularly drives and switch mode power supplies (SMPS). If the soft starter is connected to a gener-
ator-set supply, the generator may be too small or could have a speed control problem.
Troubleshooting
•
Check parameter 6-15 Frequency.
11.2.15 Ground Fault
Troubleshooting
• Test the insulation of the output cables and the motor.
• Identify and resolve the cause of any ground fault.
• Check also the following parameters:
120 | Danfoss A/S © 2020.12
Troubleshooting
AQ262141844215en-000401 / 175R1174