Display
Possible cause/Suggested solution
VZC fails px
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.
Table 10.1 Trip Messages
10.2 General Faults
describes situations where the soft starter does not operate as expected but neither trips nor issues a warning.
Symptom
Probable cause
The soft starter is not ready.
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.
The soft starter does not respond to the [Hand On]
and [Reset] keys.
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 does not respond to commands
from the control inputs.
•
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 does not respond to a start
command from either the local or remote controls.
•
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.
The soft starter does not control the motor
correctly during start.
•
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.
Troubleshooting
VLT
®
Soft Starter MCD 500
80
Danfoss A/S © 05/2016 All rights reserved.
MG17K602
10
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