Motor runs rough
Possible over-magnetization (incorrect motor settings), or
an IGBT misfiring. Note: Motor may also stall when loaded
or the frequency converter may trip occasionally on Alarm
13.
Check setting of all motor parameters.
Motor draws high current but cannot start
Possible open winding in motor or open phase in
connection to motor.
Run an AMA to check the motor for open windings and
unbalanced resistance. Inspect all motor wiring
connections.
Motor will not brake
Possible fault in the brake circuit. Possible incorrect setting
in the brake parameters. The ramp down time too short.
Note: May be accompanied by an alarm or warning
message.
Check all brake parameters and ramp down time
(parameters 2-0* and 3-4*).
4.6 Alarms and Warnings
A warning or an alarm is signalled by the relevant LED on
the front of the frequency converter and indicated by a
code on the display.
A warning remains active until its cause is no longer
present. Under certain circumstances operation of the
motor may still be continued. Warning messages may be
critical, but are not necessarily so.
In the event of an alarm, the frequency converter will have
tripped. Alarms must be reset to restart operation once
their cause has been rectified. This may be done in four
ways:
1.
By using the [Reset] control button on the LCP.
2.
Via a digital input with the “Reset” function.
3.
Via serial communication/optional fieldbus.
4.
By resetting automatically using the [Auto Reset]
function.
NOTE
After a manual reset using the [RESET] button on the LCP,
the [Auto on] button must be pressed to restart the motor.
If an alarm cannot be reset, the reason may be that its
cause has not been rectified, or the alarm is trip-locked
(see also table on following page).
Alarms that are trip-locked offer additional protection,
since the mains supply must be switched off before the
alarm can be reset. After being switched back on, the
frequency converter is no longer blocked and may be reset
as described above once the cause has been rectified.
Alarms that are not trip-locked can also be reset using the
automatic reset function in
14-20 Reset Mode
(Warning:
automatic wake-up is possible!)
If a warning and alarm is marked against a code in the
table on the following page, this means that either a
warning occurs before an alarm, or it can be specified
whether it is a warning or an alarm that is to be displayed
for a given fault.
This is possible, for instance, in
1-90 Motor Thermal
Protection
After an alarm or trip, the motor carries on
coasting, and the alarm and warning flash on the
frequency converter. Once the problem has been rectified,
only the alarm continues flashing.
Troubleshooting
High Power Service Manual for Modular F Frame Drives
MG90K202 - VLT
®
is a registered Danfoss trademark
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