Danfoss VLT MCD 600 Operating Manual page 126

VLT® Soft Starter MCD 600
Operating Guide
Troubleshooting
• Resolve the trigger condition.
• Check the following parameters:
-
Parameter 7-1 Input A Function.
-
Parameter 7-2 Input A Trip.
- Parameter 7-3 Input A Trip Delay.
- Parameter 7-4 Input A Initial Delay.
- Parameter 7-5 Input B Function.
- Parameter 7-6 Input B Trip.
-
Parameter 7-7 Input B Trip Delay.
-
Parameter 7-8 Input B Initial Delay.
11.2.20 Instantaneous Overcurrent
Cause
This trip is not adjustable. The current on all 3 phases has exceeded 7.2 times the value of parameter 1-2 Motor Full Load Current.
Causes can include a locked rotor condition or an electrical fault in the motor or cabling.
Troubleshooting
• Check for jammed loads.
• Check for faults in the motor and in the cables.
• There are no parameters related to this trip message.
11.2.21 Internal Fault X (Where X is a number)
Cause
The soft starter has tripped on an internal fault.
Troubleshooting
• Contact Danfoss with the fault code (X).
11.2.22 Internal Fault 88
Cause
The soft starter firmware does not match the hardware.
11.2.23 LCP Disconnected
Cause
Parameter 1-1 Command Source is set to Remote LCP, but the soft starter cannot detect a remote LCP.
Troubleshooting
• If a remote LCP is installed, check that the cable is firmly connected to the soft starter.
•
If no remote LCP is installed, change the setting of parameter 1-1 Command Source.
11.2.24 L1/L2/L3 Phase Loss
Cause
This trip is not adjustable. During pre-start checks, the soft starter has detected a phase loss as indicated. In run state, the soft starter
has detected that the current on the affected phase has dropped below 10% of the programmed motor FLC for more than 1 s. This
current drop indicates that either the incoming phase or connection to the motor has been lost.
Troubleshooting
• For the soft starter and the motor, check
122 | Danfoss A/S © 2020.12
Troubleshooting
AQ262141844215en-000401 / 175R1174