6 Troubleshooting
6.1 Warnings and Alarms
When the frequency converter fault circuitry detects a fault
condition or a pending fault, a warning, or alarm is issued.
A flashing display on the LCP indicates an alarm or
warning condition and the associated number code on line
2. Sometimes a warning precedes an alarm.
6.1.1 Alarms
An alarm causes the frequency converter to trip (suspend
operation). The frequency converter has 3 trip conditions
which are displayed in line 1:
TRIP (AUTO RESTART)
The frequency converter is programmed to restart
automatically after the fault is removed. The number of
automatic reset attempts can be continuous or limited to a
programmed number of attempts. If the selected number
of automatic reset attempts is exceeded, the trip condition
changes to TRIP (RESET).
TRIP (RESET)
Requires resetting of the frequency converter before
operation after a fault is cleared. Press [Reset] to reset the
frequency converter manually, or use a digital input, or a
fieldbus command. For NLCP, the stop and reset are the
same key. If [Off/Reset] is used to reset the frequency
converter, press [Start] to initiate a run command in either
Hand On or Auto On mode.
TRIPLOCK (DISC>MAINS)
Disconnect the mains AC input power to the frequency
converter long enough for the display to go blank. Remove
the fault condition and reapply power. Following power-up,
the fault indication changes to TRIP (RESET) and allows for
manual, digital, or fieldbus reset.
6.1.2 Warnings
During a warning, the frequency converter remains
operational, although the warning flashes for as long as
the condition exists. The frequency converter could,
however, reduce the warning condition. For example, if the
warning displayed was
Torque Limit
(Warning 12), the
frequency converter would be reducing speed to
compensate for the overcurrent condition. In some cases, if
the condition is not corrected or worsens, an alarm
condition is activated and the frequency converter output
to the motor terminals. Line 1 identifies the warning in
plain language and line 2 identifies the warning number.
6.1.3 Warning/alarm Messages
The LEDs on the front of the frequency converter and a
code in the display signal a warning or an alarm.
LED indication
Warning
Yellow
Alarm
Flashing red
Table 6.1 Control Terminals and Associated Parameter
A
warning
indicates a condition that requires attention, or
a trend that would eventually require attention. A warning
remains active until the cause is no longer present. Under
some circumstances, motor operation could continue.
An alarm triggers a
trip
. The trip removes power to the
motor. It can be reset after the condition has been cleared
by pressing [Reset], or through a digital input (parameter
group
5–1* Digital Inputs
). The event that caused an alarm
cannot damage the frequency converter, or cause a
dangerous condition. Alarms must be reset to restart
operation once their cause has been rectified.
The reset can be done in 3 ways:
•
Press [Reset].
•
A digital reset input.
•
Serial communication/optional fieldbus reset
signal.
NOTICE
After a manual reset pressing [Reset], press [Auto On] to
restart the motor.
A warning precedes an alarm.
A trip lock is an action when an alarm occurs which can
damage the frequency converter or connected equipment.
Power is removed from the motor. A trip lock can only be
reset after a cycling power has cleared the condition. Once
the problem has been rectified, only the alarm continues
flashing until the frequency converter is reset.
The warnings and alarms are explained in
.
Troubleshooting
VLT
®
AutomationDrive FC 360
144
Danfoss A/S © 7/2015 All rights reserved.
MG06C602
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