Danfoss VLT Series Service Manual page 12

Section Two
ALARM MESSAGES
ALARM
TRIP0LOCK000000
GROUND0FAULT000
2 - 4
GROUND FAULT (5)
This message indicates a leakage to ground on the output of the inverter. To
remedy this fault, check the output wiring and motor for ground faults. It is also
necessary to ensure that the VLT has been properly grounded. This fault returns a
"Trip Locked". Also see Ground Fault Trips.
OVER TEMP (6)
This message indicates that the unit's heatsink temperature or the unit's internal
ambient temperature has exceeded permissible limits. All units covered by this
manual use a resetting thermal switch. The thermal switch is located on either the
ILD Card or is mounted on the heatsink of units which use the Interface Card. To
remedy the fault, correct the over temperature condition. This fault returns a "Trip."
Also see Overtemp Trips.
INVERT TIME (7)
This message indicates the unit has delivered greater than 105% of the unit's
continuous current rating for too long (inverse time function). Prior to this fault
condition the "Invert Time" warning will be displayed. To remedy this fault, reduce
the motor load to at or below the unit's continuous current rating. This fault returns
a "Trip Locked". During the trip the counter will count down. Upon reaching 90%,
the "Trip Locked" will change to "Trip".
MOTOR TIME (8)
This message indicates the motor has consumed greater than 116% of the value
entered in parameter 107 (motor nominal current) for too long (inverse time function).
This fault may also be caused from running the motor at a low speed and high
current for too long a period of time. This trip will only occur if the "Motor Thermal
Protection" has been activated in parameter 315. Prior to the trip the "Motor
Time" warning will be displayed. To remedy this fault, reduce the load on the
motor or raise the motor's speed. This fault returns a "Trip Locked". During the
trip the counter will count down. Upon reaching 0% the "Trip Locked" will change
to "Trip".
CURRENT LIMIT (9)
This message will be displayed if the unit has run in current limit for a time which
exceeds the setting in parameter 310. To remedy this fault, reduce the motor's
load or verify that the correct settings have been entered in parameter 209 (Current
Limit) and parameter 310 (Current Limit Trip Delay). This fault returns a "Trip". See
Current Limit Trips.
MOTOR TRIP (15)
This message will be displayed if parameter 400 is set to "Thermistor" and motor
thermistor connected between terminals 50 and 16 has increased to a resistance
of 3KΩ. To remedy this fault remove the motor over temperature condition. This
fault returns a "Trip". The Reset Button can be held to allow access to the
parameters.
EXCEPT FAULT
This fault is usually the result of electrical noise caused by a poor earth ground
connection to the VLT. This fault may also be seen if Adaptive Motor Tuning is
attempted on a motor many times larger than the drive rating (parameter 106).
(This fault is accompanied by the PC address where an illegal value was found,
also see page 4-1.)