Appendix
– Troubleshooting
19
Faults/Alarms/Difficulties
Description
Solutions
Spd Dev Flt
or
Spd Dev Alm
The speed feedback is failing
to properly track the speed
reference
Encoder Cable not properly
grounded
Verify encoder cable is
properly grounded
Encoder Hardware
Verify encoder operation
Motor Runaway Condition
–
(PM)
Verify that the rider wheel is
firmly connected to the rotor
and that the encoder spins as
the rotor is spinning
Drive and/or Motor is
Undersized
Perform another
Alignment Procedure on
page 11
Usually drive’s “HIT
TORQUE LIMIT” alarm
message is displayed
(depending on setting of TRQ
LIM MSG DLY (A1)
parameter)
Verify drive and/or motor
sizing. May need a larger
capacity HPV 900 S2 and/or
motor.
Check Parameter Settings
–
PM
Check for the proper setting
of Encoder Pulses (A1)
Usually drive’s “HIT
TORQUE LIMIT” alarm
message is displayed
(depending on setting of TRQ
LIM MSG DLY (A1)
parameter)
Check speed regulator
parameters RESPONSE and
INERTIA (A1)
Fault/Alarm sensitivity
– SPD
DEV FLT LVL or SPD DEV
ALM LVL (A1) parameter is
set too low for required
acceleration/deceleration
rate.
NOTE:
Setting SPD DEV FLT
LVL too high will reduce drive’s
sensitivity runaway conditions!
