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1.4
Diagnostics and Fault Handling
A number of diagnostic and fault detection circuits are incorporated in the LX amplifier
to protect the drive. Some faults like over voltage, under voltage and amplifier or motor
over temperature reset when the fault is cleared. Other faults such as short- circuit at
the motor output terminals and/or resolver fault need to be reset by cycling power. Ixt
trip is not a fault condition, it simply folds back the current command to the DIP switch
setting until the demand is reduced.
The Ixt trip is not operational in the current command mode. See Section 6
(Special Applications) for details.
Table 1-B
Condition
Motor over
temperature
Amp overtemp >95°
C
Over voltage
Under voltage
Output short ckt
Resolver fault
High Irms
Backup Logic
Supply
active mode
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Display
Drive OK
LED on
LED on
Drive OK - contact
Drive OK - LED off
LED on
Drive OK - on
LED on
contact closed
Drive OK – contact
opens for about 2
seconds then
closes. LED follows
contact action.
Reset Action
Required
Auto reset on temp
Auto reset on temp
Auto reset on return
open
to normal voltage
Auto reset on return
to normal voltage
Cycle power
Cycle power
Not a fault.
Indicates current
limiting action.
Re-application of
AC Line power
Section 1 – Page 9
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