7-14 Trips and Fault Finding
DC590+ DRV Series DC Digital Drive
Using the Keypad to Manage Trips
Trip Messages
Most of the alarms have a delay timer so that the Drive only trips if the condition persists for the whole of the delay period.
If the Drive trips, then the display immediately shows a message indicating the reason for the trip. The possible trip messages are given in the table
below.
Trip Message and Meaning Possible Reason for Trip Corrective Action
Improperly set maximum speed
parameters
Use hand tachometer to ensure proper speed and adjust
the speed calibration parameter
OVERSPEED
Motor overspeed - the speed
feedback signal has exceeded 125%
of rated speed.
Alarm time delay: 50ms
Wrong type of feedback selected in
SPEED FBK SELECT parameter in MMI
Change parameter to match feedback type
Calibration set incorrectly on Analog
Tachometer Calibration Option Board
Verify calibration setting
Improper calibration of drive speed
feedback, encoder ppr selection for
example
Recalibrate the speed feedback
Improper tuning of speed loop
parameters - drive overshooting or
unstable
Retune drive speed loop
Coupling between motor and
feedback device slipping
Stop drive and isolate power - check tightness of
coupling
Feedback device noisy or defective Replace tachometer generator
Bottom two LEDs on the 5701
Microtach receiver board are out
Weak feedback signal intensity; check connections, fiber
optic wire integrity, and transmission distances
Field weakening parameters
incorrectly set
Reconfigure the field weakening parameters as
described in Chapter 4.
Drive operating as current regulator Check external speed loop adjustments
Drive not Autotuned (unstable current
loop)
Perform the AUTOTUNE procedure
SCR gate connection loose Check SCR gate connections from the trigger board to
the SCR gate leads
MISSING PULSE
A missing pulse from the 6-pulse
armature current waveform. Trips
when the motor loading exceeds 1.5
times the DISCONTINUOUS
parameter value.
SCR defective Check SCRs with an ohmmeter. See SCR
Troubleshooting, page
7-27
To Next Page
Loading...
