Danfoss VLT MCD 600 Operating Manual page 123

VLT® Soft Starter MCD 600
Operating Guide
• A phase loss on mains terminals L1, L2, or L3 during Run mode.
• An SCR that has failed open circuit. A failed SCR can only be diagnosed accurately by replacing the SCR and checking the soft
starter performance.
Troubleshooting
• Check the following parameters:
-
Parameter 5-1 Current Imbalance.
-
Parameter 5-2 Current Imbalance Delay.
- Parameter 6-3 Current Imbalance.
11.2.6 Current Read Err Lx (Where X is 1, 2, or 3)
Cause
Internal fault (PCB fault). The output from the current transformer circuit is not close enough to 0 when the SCRs are turned off.
Troubleshooting
• Contact the local Danfoss supplier for advice.
• There are no related parameters to this trip message.
11.2.7 Depth Sensor
Cause
The smart card has detected a fault with the depth sensor.
Troubleshooting
• Check the following parameters:
- Parameter 30-12 Depth Sensor Type.
- Parameter 36-3 Depth Sensor.
11.2.8 EEPROM Fail
Cause
An error occurred loading data from the EEPROM to RAM when the LCP powered up.
Troubleshooting
• If the problem persists, contact the local distributor.
• There are no parameters related to this trip message.
11.2.9 Excess Start Time
Cause
Excess start time trip can occur under the following conditions:
• Parameter 1-2 Motor Full Load Current is not appropriate for the motor.
• Parameter 2-4 Current Limit has been set too low.
• Parameter 2-2 Start Ramp Time has been set greater than the setting for parameter 5-15 Excess Start Time.
•
Parameter 2-2 Start Ramp Time is set too short for a high inertia load when using adaptive control.
Troubleshooting
• Parameter 1-2 Motor Full Load Current.
• Parameter 2-2 Start Ramp Time.
•
Parameter 2-4 Current Limit.
•
Parameter 3-4 Start Ramp Time-2.
•
Parameter 3-6 Current Limit-2.
11.2.10 Firing Fail Px (Where X is phase 1, 2, or 3)
Cause
The SCR did not fire as expected.
Danfoss A/S © 2020.12
Troubleshooting
AQ262141844215en-000401 / 175R1174 | 119