Danfoss VLT Midi Drive FC 280 Programming Guide

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 ashing 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 shown 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. To reset the frequency
converter manually, press [Reset] or use a digital input, or
a eldbus command. For NLCP, Stop and Reset are the
same key, [O/Reset]. If [O/Reset] is used to reset the
frequency converter, press [Start] to initiate a run
command in either hand-on mode or auto-on mode.
Trip lock (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 eldbus reset.
6.1.2 Warnings
During a warning, the frequency converter remains
operational, although the warning ashes for as long as
the condition exists. The frequency converter could,
however, reduce the warning condition. For example, if the
warning shown was warning 12, Torque Limit, the frequency
converter would reduce speed to compensate for the
overcurrent condition. Sometimes, if the condition is not
corrected or worsens, an alarm condition is activated and
the frequency converter output to the motor terminals.
Line 1 identies the warning in plain language and line 2
identies 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.
Warning Yellow
Alarm Flashing red
Table 6.1 LED Indication
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
rectied.
The reset can be done in 3 ways:
•
Press [Reset].
•
A digital reset input.
•
Serial communication/optional eldbus 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
rectied, only the alarm continues
ashing until the frequency converter is reset.
The alarm words, warning words and extended status
words can be accessed via eldbus or optional eldbus for
diagnosis.
Troubleshooting Programming Guide
MG07C102 Danfoss A/S © 12/2015 All rights reserved. 133
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Danfoss VLT Midi Drive FC 280 Specifications

General

Brand	Danfoss
Model	VLT Midi Drive FC 280
Category	DC Drives
Language	English