Trips and Fault Finding 7-15
DC590+ DRV Series DC Digital Drive
Trip Message and Meaning Possible Reason for Trip Corrective Action
SCR firing pcb defective Replace the pcb
Motor has opened or shorted coil Check the motor with an ohmmeter and megger for
insulation and continuity
Coupling between motor and
feedback device slipping
Stop drive and isolate power - check coupling tightness
Feedback device noisy or defective Replace tachometer generator if noise is present while
observing feedback with an oscilloscope
Bottom two LEDs on the 5701
Microtach receiver board are out
Weak feedback signal intensity; check connections, fiber
optic wire integrity, and transmission distances
Alarm time delay : 60 seconds
Note that the MISSING PULSE trip is
not intended or able to protect the
drive if a thyristor fails to function
during regenerative operation. This
can result in damage to the drive.
We recommend fusing the armature
circuit if regenerative operation is
intended. The MISSING PULSE trip is
intended to detect firing circuit
problems during motoring operation
of the drive.
NOTE Ripple from the speed loop
from either the setpoint or
feedback can cause unstable
current
Speed loop gain too high Retune drive speed loop
Regulator failure Contact Product Support FIELD OVER I
The motor field current has exceeded
120% of the calibrated value
Alarm time delay : 10 seconds
Badly tuned control loop (alarm only
operates with field current control
mode selected)
Retune control loop
The ambient air temperature is too
high
Check cooling, ambient air temperature must not exceed
40°C (104°F) for full rating
Poor ventilation or spacing between
drives
Improve ventilation, if necessary reposition drives
ensuring correct spacing
Fan failure Check fuse on power board, wrong rotation (models
above 70A bridge rating)
Blocked ventilation slots Clear ventilation slots
Clogged air filters Clean or replace air filters
HEATSINK TRIP
The drive heatsink temperature is too
high
Alarm time delay : 0.5 seconds
NOTE The stack must be allowed to
cool in order to re-start the
drive.
Excessive armature current Check nominal armature current on motor nameplate
against the current calibration for the drive
Motor thermal protection device not
wired to drive or
thermistor/thermostat open circuited
Check TH1 to TH2 connections to drive - connect TH1 to
TH2 if motor not fitted with a thermal protection device
(thermistor/thermostat)
Blower motor rotating in wrong
direction (force ventilated motors)
Check direction of fan agrees with arrow on motor
blower motor assembly or motor manual
THERMISTOR
The motor temperature is too high
Motor thermistor/thermostat input
open or high impedance
Alarm time delay : 5 seconds
Blower filter clogged Clean or replace filter
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