Troubleshooting; Trip Messages - Danfoss vlt soft starter mcd 500 Operating Manual

Troubleshooting

10 Troubleshooting
When a protection condition is detected, the VLT
Starter MCD 500 writes this condition to the event log and
may also trip or issue a warning. The soft starter response
depends on the protection action settings (parameter
group 16 Protection Actions).
Some protection responses cannot be adjusted. Usually,
external events (for example phase loss) or a fault within
the soft starter cause these trips. These trips do not have
associated parameters and cannot be set to Warn or Log.
If the soft starter trips:

10.1 Trip Messages

Table 10.1 lists the protection mechanisms in the soft starter and the probable cause of the trip. Some of these protection
mechanisms can be adjusted using parameter group 2 Protection and parameter group 16 Protection Action. Other settings are
built-in system protections and cannot be set or adjusted.
Display
Awaiting data
Battery/clock
Controller
Current imbalance
Current read err lx
MG17K602
Operating Guide
®
Soft
Possible cause/Suggested solution
The LCP does not receive data from the control PCB. Check the cable connection and the fitting of
the display on the soft starter.
A verification error has occurred on the real-time clock, or the back-up battery voltage is low. If
the battery is low and the power is off, date/time settings are lost. Reprogram the date and time.
Related parameter:
•
Parameter 16-12 Battery Clock.
Name selected for a programmable input. Refer to Input A trip.
Problems with the motor, the environment, or the installation can cause current imbalance, such
as:
•
An imbalance in the incoming mains voltage.
•
A problem with the motor windings.
•
A light load on the motor.
•
A phase loss on mains terminals L1, L2, or L3 during run mode.
An SCR that has failed open circuit. A failed SCR can only be diagnosed accurately by replacing the
SCR and checking the soft starter performance.
Related parameters:
•
Parameter 2-2 Current Imbalance.
•
Parameter 2-3 Current Imbalance Delay.
•
Parameter 16-2 Current Imbalance.
Where X is 1, 2, or 3.
Internal fault (PCB fault). The output from the current transformer circuit is not close enough to 0
when the SCRs are turned off. Contact the local Danfoss supplier for advice.
This trip is not adjustable.
Related parameters: None.
Danfoss A/S © 05/2016 All rights reserved.
1. Identify and clear the condition that triggered the
trip.
2. Reset the soft starter.
3. Restart the soft starter.
To reset the soft starter, press [Reset] or activate the Reset
remote input.
If the soft starter has issued a warning, it resets itself when
the cause of the warning has been resolved.
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