General Faults - Danfoss VLT MCD 600 Operating Manual

VLT® Soft Starter MCD 600
Operating Guide
Troubleshooting
• Contact the local Danfoss supplier for advice.
• There are no parameters relatedto this trip message.
11.2.55 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.

11.3 General Faults

See Table 215 for situations where the soft starter does not operate as expected but neither trips nor issues a warning.
Table 215: General Faults
Symptom Probable cause/suggested solution
"Not ready" on dis- The reset input may be active. If the reset input is active, the soft starter does not operate.
play
The soft starter is running simulation software. This software is intended for demonstration purposes on-
Simul on display
ly and is not suitable for controlling a motor. Contact the local supplier for advice.
The soft starter does
The soft starter only accepts commands from the LCP if parameter 1-1 Command Source is set to Remote
not respond to the
LCP. Check that the Local LED on the soft starter is on.
[Hand on] and [Re-
set] keys.
The soft starter does
•
not respond to com-
mands from the con-
•
trol inputs.
•
The soft starter does
•
not respond to a
start command from
•
either the LCP or the
digital inputs.
•
•
•
Erratic and noisy mo- If the soft starter is connected to the motor using inside delta configuration, the soft starter may not be
tor operation detecting the connection correctly. Contact the local supplier for advice.
Danfoss A/S © 2020.12
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 Start/Stop) for details.
The signal to the remote inputs may be incorrect. Test the signaling by activating each input signal in
turn.
The soft starter may be waiting for the restart delay to elapse. Parameter 5-16 Restart Delay controls
the length of the restart delay.
The motor may be too hot to allow a start. The soft starter only allows a start when it calculates that
the motor has sufficient thermal capacity to complete the start successfully. Wait for the motor to
cool, before attempting another start.
The reset input may be active. If the reset input is active, the soft starter does not operate.
The soft starter may be waiting for control signals via the communications network (parameter 1-1
Command Source set to Network).
The soft starter may be waiting for a scheduled auto-start (parameter 1-1 Command Source set to
Clock).
Troubleshooting
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