General Faults - Danfoss VLT MCD 600 Operating Manual
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Operating Guide | VLT® Soft Starter MCD 600
12.2.52 VZC Fail Px
Cause
Where X is 1, 2, or 3. Internal fault (PCB fault). Contact the local Danfoss supplier for advice. Related parameters: None.
12.2.53 Zero Speed Detect
Cause
The zero-speed detect input has not closed within the expected duration of a soft stop.
Troubleshooting
•
Check that the zero-speed sensor is operating correctly.
•
Check that parameter 2-17 Brake Current Limit and parameter 5-15 Excess Start Time are appropriate for the application.
•
Check the following parameters:
-
Parameter 2-17 Brake Current Limit.
-
Parameter 3-19 Brake Current Limit-2.
-
Parameter 5-15 Excess Start Time.
12.3 General Faults
See
table 244
for situations where the soft starter does not operate as expected but neither trips nor issues a warning.
Table 244: General Faults
Symptom
The soft starter is not
ready.
Simul on display
The soft starter does
not respond to the
[Start] and [Reset] keys.
The soft starter does
not respond to com-
mands from the con-
trol inputs.
138 | Danfoss A/S © 2018.10
Probable cause/suggested solution
The reset input may be active. If the reset input is active, the soft starter does not operate.
The soft starter is running simulation software. This software is intended for demonstration purposes only
and is not suitable for controlling a motor. Contact the local supplier for advice.
The soft starter only accepts commands from the LCP if parameter 1-1 Command Source is set to Remote
Keypad. Check that the Local LED on the soft starter is on.
•
The soft starter only accepts commands from the inputs if parameter 1-1 Command Source is set to
Digital Input. Check the setting of parameter 1-1 Command Source.
•
The control wiring may be incorrect. Check that the remote start, stop, and reset inputs are config-
ured correctly (see
5.4.3
•
The signal to the remote inputs may be incorrect. Test the signaling by activating each input in turn.
Start/Stop) for details.
Troubleshooting
AQ262141844215en-000202 / 175R1174
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