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Troubleshooting
147
Name
Description
Possible Causes & Corrective Action
Spd Dev Flt
(PM)
[F63]
&
Spd Dev Alm
[F76]
The speed feedback is failing to
properly track the speed reference
.
Encoder Cable not properly grounded
Verify Encoder Cable is properly grounded
using the shield clamp provided on the
drive
Motor Runaway Condition
– (PM)
Encoder is slipping on the shaft
– fix the
encoder coupling and repeat the alignment
Wrong ENCODER ANG OFFSET (A5)
value is uploaded or entered
– enter
correct value or repeat the alignment
The absolute position encoder is not in
sync with motor phasing (would be
detected during the open loop alignment,
but NOT if manual or auto alignment
methods were used). Swap two motor
leads. If Encoder Flt is set after swapping
the motor leads, switching encoder leads
(A and /A).
For Incremental PM an auto alignment will
occur at the beginning of the next run.
Verify FINE TUNE OFST (A4) is 0.00 (for
ENDAT PM) or value consistent with
previous value found during Incremental
startup.
Drive and/or Motor is Undersized
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 PM and/or
motor.
Check Parameter Settings
– PM
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!
Check Parameter Settings
– Closed Loop
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 HI LVL
parameter is set too low for required
acceleration/deceleration rate.