Danfoss Metasys N2 Service Guide

Motor runs rough
Cause:
•
Possible overmagnetization.
•
IGBT misring.
•
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
xed.
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 eldbus.
•
By resetting automatically using the [Auto Reset]
function.
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 xed or that the alarm is a trip lock. Refer to
Table 6.2.
Trip lock alarms
oer extra protection, since the mains
supply must be switched o 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 xed.
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.
•
Always use the manual restart setting in
parameter 14-20 Reset Mode.
If both a warning and alarm are marked for a code in
Table 6.2, it means that either:
•
A warning occurs before an alarm.
•
It can be specied whether a warning or an alarm
is shown for a given fault.
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 ash on the drive. Once the problem has been
xed, only the alarm continues ashing.
Troubleshooting Service Guide
MG94A502 Danfoss A/S © 02/2019 All rights reserved. 63
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Danfoss Metasys N2 Specifications

General

Brand	Danfoss
Model	Metasys N2
Category	DC Drives
Language	English