General Faults - Danfoss vlt soft starter mcd 500 Operating Manual

Troubleshooting
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Table 10.1 Trip Messages

10.2 General Faults

Table 10.2 describes situations where the soft starter does not operate as expected but neither trips nor issues a warning.
Symptom
The soft starter is not ready.
The soft starter does not respond to the [Hand On]
and [Reset] keys.
The soft starter does not respond to commands
from the control inputs.
10 10
The soft starter does not respond to a start
command from either the local or remote controls.
The soft starter does not control the motor
correctly during start.
80
®
VLT Soft Starter MCD 500
Possible cause/Suggested solution
Where X is 1, 2, or 3.
Internal fault (PCB fault). Contact the local Danfoss supplier for advice.
This trip is not adjustable.
Related parameters: None.
Probable cause
Check input A (11, 16). Check if the soft starter is disabled via a programmable input.
If parameter 3-3 Input A Function is set to Starter disable, and there is an open circuit
on the corresponding input, the soft starter does not start.
Check if the soft starter is in auto-on mode. When the soft starter is in auto-on
mode, the hand-on LED on the soft starter is off. Press [Auto On] once to change to
local control.
•
The soft starter waits for the restart delay to elapse. Parameter 2-11 Restart delay
controls the length of the restart delay.
•
The motor may be too hot to allow a start. If parameter 2-12 Motor temperature
check is set to Check, 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.
•
Check if the soft starter is disabled via a programmable input. If parameter 3-3
Input A Function is set to Starter disabled, and there is an open circuit on
terminals 11 and 16, the soft starter does not start. If there is no further need to
disable the soft starter, close the circuit on the input.
NOTICE
Parameter 3-1 Local/remote controls when the [Auto On] key is enabled.
•
The soft starter may be waiting for the restart delay to elapse. Parameter 2-11
Restart delay controls the length of the restart delay.
•
The motor may be too hot to allow a start. If parameter 2-12 Motor temperature
check is set to Check, the soft starter only allows a start when it calculates that
the motor has sufficient thermal capacity to complete the start successfully.
•
Check if the soft starter is disabled via a programmable input. If parameter 3-3
Input A function is set to Starter disable and there is an open circuit on terminals
11 and 16, the soft starter does not start. If there is no further need to disable
the soft starter, close the circuit on the input.
NOTICE
Parameter 3-1 Local/remote controls when [Auto On] is enabled.
•
Start performance may be unstable when using a low motor FLC setting
(parameter 1-1 Motor Full Load Current). This can affect use on a small test motor
with full load current of 5–50 A.
•
Install power factor correction (PFC) capacitors on the supply side of the soft
starter. To control a dedicated PFC capacitor contactor, connect the contactor to
run relay terminals.
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