Parker 590+ DRV - Page 211

Trips and Fault Finding 7-17
DC590+ DRV Series DC Digital Drive
Trip Message and Meaning Possible Reason for Trip Corrective Action
Analog tachometer feedback polarity
incorrect (terminals G3 and G4)
Reverse tachometer leads, or swap encoder connections
Armature volts miscalibrated Check armature voltage calibration setting, Chapter 4.
Tachometer generator miscalibrated Check Analog Tachometer Calibration Option Board
setting are for the proper feedback voltage at motor top
speed
Armature voltage sensing leads
miswired or damaged
Check wiring of armature voltage sensing wires AS+,
AS- from DC contactor to power supply board
Coupling between motor and
feedback device slipping
Stop drive and isolate power - check tightness of
coupling
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
Motor has opened or shorted coils Check the motor for insulation continuity
SPEED FEEDBACK
The difference between speed
feedback and armature voltage
feedback is greater than the SPDFBK
ALM LEVEL parameter value
If FLD WEAK ENABLE parameter is
enabled, speed feedback is less than
10% when in the field weakening
region
Alarm time delay : 0.125 seconds
Analog tachometer feedback wires or
shield loose or shorted to ground
Reconnect the wiring
Optional Encoder board is not fitted The SPEED FBK SELECT parameter is set to ENCODER
but board not fitted
Wire-ended encoder wires loose Check cable and connections
ENCODER FAILED
No speed feedback signal
Microtach encoder wires loose or
damaged
Check fibre optic cable for damage, bend radius,
operating length - refer to Microtach handbook.