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11.2.48 Thermistor Cct (Thermistor Circuit)
Cause
The thermistor input has been enabled and:
The resistance at the input has dropped below 20 Ω (the cold resistance of most thermistors is above this value) or
A short circuit has occurred.
Troubleshooting
Check and resolve this condition.
There are no parameters related to this trip message.
11.2.49 Time - Overcurrent
Cause
The soft starter is internally bypassed and has drawn high current during running. (The 10 A protection curve trip has been reached,
or the motor current has risen to 600% of the motor FLC setting.)
There are no parameters related to this trip message.
11.2.50 Undercurrent
Cause
The motor has experienced a sharp drop in current, caused by loss of load. Causes can include broken components (shafts, belts, or
couplings) or a pump running dry.
Troubleshooting
Check the following parameters:
Parameter 5-3 Undercurrent.
Parameter 5-4 Undercurrent Delay.
Parameter 6-4 Undercurrent.
11.2.51 Underpower
Cause
The motor has experienced a sharp drop in power, caused by loss of load. Causes can include broken components (shafts, belts, or
couplings), or a pump running dry.
Troubleshooting
Check the following parameters:
Parameter 5-11 Underpower.
Parameter 5-12 Underpower delay.
Parameter 6-8 Underpower.
11.2.52 Undervoltage
Cause
Mains voltage has dropped below the level selected. Causes can include an undersized supply or adding a large load to the system.
Troubleshooting
Check the following parameters:
Parameter 5-7 Undervoltage.
Parameter 5-8 Undervoltage Delay.
Parameter 6-6 Undervoltage.
11.2.53 Unsupported Option
Cause
The selected function is not available (for example jog is not supported in inside delta configuration).
There are no parameters related to this trip message.
11.2.54 VZC Fail Px (Where X is 1, 2, or 3)
Cause
Internal fault (PCB fault).
AQ262141844215en-000401 / 175R1174128 | Danfoss A/S © 2020.12
Troubleshooting
VLT® Soft Starter MCD 600
Operating Guide
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