Alarms And Warnings; Overview Of Alarms And Warnings - Danfoss VLT FC Series Service Manual

Troubleshooting
Motor runs rough
Cause:
•
Possible overmagnetization.
•
IGBT misfiring.
•
Motor under heavy load.
•
Alarm 13, Overcurrent tripping intermittently.
In parallel drive modules:
•
Missing output connection in an individual drive
module.
•
Missing DC link connections.
Action: Check settings of all motor parameters. Refer to
chapter 8.5.9 Output Imbalance of Motor Voltage and
Current. If output voltage is unbalanced, perform the
chapter 8.5.11 IGBT Gate Drive Signals Test. In parallel drive
systems, check the modules for loose connections.
Motor draws high current, but cannot start
Cause: Possible open winding in motor or open phase in
connection to motor.
Action: To check the motor for opening windings and
unbalanced resistance, run an AMA. To ensure that the
drive is providing correct output, refer to
chapter 8.5.9 Output Imbalance of Motor Voltage and
Current. If output voltage is unbalanced, perform the
chapter 8.5.11 IGBT Gate Drive Signals Test. Inspect all motor
wiring connections.
Motor does not brake
Cause: Possible fault in the brake circuit. Possible incorrect
setting in the brake parameters. The ramp-down time is
too short. The LCP shows an alarm or warning message.
Action: Check all brake parameters and ramp-down time
(parameter groups 2-0* DC-Brake and 3-4* Ramp 1). Perform
the procedures in chapter 8.4.3 Brake IGBT Test.

6.6 Alarms and Warnings

6.6.1 Overview of Alarms and Warnings

The drive indicates a warning or an alarm by the relevant
indicator light on the LCP and a code on the display.
A warning remains active until its cause is no longer
present. Under certain circumstances, operation of the
motor can be continued. Warning messages can be critical,
but are not necessarily so.
An alarm indicates that the drive tripped. The alarm must
be reset to restart operation once its problem is fixed.
Resetting can be done in any of 4 ways:
•
By using the [Reset] control key on the LCP.
•
Via a digital input with the reset function.
•
Via serial communication/optional fieldbus.
•
By resetting automatically using the [Auto Reset]
function.
MG94A502
Service Guide
NOTICE
MANUAL RESET
After a manual reset using the [RESET] key on the LCP,
the [Auto On] key must be pressed to restart the motor.
If an alarm cannot be reset, it is possible that the problem
is not fixed or that the alarm is a trip lock. Refer to
Table 6.2.
Trip lock alarms offer extra protection, since the mains
supply must be switched off before the alarm can be reset.
After being switched back on, the drive is no longer
blocked and can be reset once the problem is fixed.
Alarms that are not trip locks also can be reset using the
automatic reset function in parameter 14-20 Reset Mode.
WARNING
AUTOMATIC RESET
Automatic reset is not recommended in industrial
applications where it can unexpectedly cause the drive
and motor to restart. Failure to use manual reset in
industrial applications can cause death or serious injury.
•
If both a warning and alarm are marked for a code in
Table 6.2, it means that either:
•
•
This situation is possible, for instance, in
parameter 1-90 Motor Thermal Protection.
After an alarm or trip, the motor coasts, and the alarm and
warning flash on the drive. Once the problem has been
fixed, only the alarm continues flashing.
Danfoss A/S © 02/2019 All rights reserved.
Always use the manual restart setting in
parameter 14-20 Reset Mode.
A warning occurs before an alarm.
It can be specified whether a warning or an alarm
is shown for a given fault.
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