Section 7 – Page 1
7
DIAGNOSTICS
7.1 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 lxt trip is not operational in the current command mode. See Section 6
(Special applications) for details.
Table 7-A
CONDITION DISPLAY DRIVE OK RESET ACTION REQUIRED
Motor Over temperature LED on Auto reset on Temp drop
Amp Overtemp >95°C
LED on Auto reset on Temp drop
Over voltage
Drive OK contact open
Auto reset on return to normal
voltage
Under voltage Drive OK LED off
Auto reset on return to normal
voltage
Output short Ckt Cycle power
Resolver Fault LED on Cycle power
High Irms LED on
Drive OK on, contact
closed
Not a fault. Indicates current
limiting action.
Backup Logic Supply
active mode
Drive OK contact opens
for about 2 seconds then
closes. LED follows
contact action.
Re-application of AC Line
power
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