Sprint Electric 4Q 3600XRi, Product Manual

Page: 31 / 36

25 Trouble shooting
9 9 Trouble shooting Trouble shooting
PROBLEM LIKELY CAUSES REMEDY
Drive will not
power-up, or no ON
indication
Line fuses blown POWER OFF! Check circuits and replace
fuses with correct type (see Rating table,
page 28)
On-board F1, F2 fuses blown Check field wiring
Damaged transformer Check supply select jumper
Line fuses blow on
power-up
Short circuit load Check load circuit
Damaged unit Replace unit
Fuses blow during
running
Excessive armature voltage due to
incorrect speed scaling
Reduce armature voltage
Check speed scaling is correct
Motor accelerates out
of control with small
setpoint and tacho
feedback
Tacho polarity incorrect Swap terminals 8 and 9
Tacho coupling broken or slipping Check integrity of coupling
Tacho is faulty Replace the tacho. In emergency, change
to AVF (S8) and rescale voltage (S3 S4)
- remove tacho connections from terminals
Motor runs too fast or
too slow
Incorrect speed scaling (S3, S4 MAX SPEED) Refer to "7.4.2.2 S3 / S4" on page 15
Stall lamp ON
Refer to "7.4.4 LEDs"
on page 17 for
STALL and TIMER
lamp operation
Insufficient torque Check current settings (S1, S2 MAX
CURRENT)
Timer lamp shows that stall timer is
integrating
Check the motor is correctly rated for the
application
No field, motor jammed Check the circuits and motor
No armature current Check the armature circuit
Demagnetised PM motor Replace the motor
Motor jammed Free the motor
Motor will not turn
(timer/stall lamps
NOT lit)
No run circuit Check run circuit T7 to T5
No start circuit Check start circuit T13, T14 to T5
No setpoint Check the external setpoint T3
Motor rotates in
wrong direction
Transposed motor connections Swap armature or field connections
Motor noise Unstable drive Rotate STAB anticlockwise
Armature voltage rating of motor does not
match AC supply
Use a more suitable motor and/or lower
supply voltage
Armature time constant too low Insert a choke in series with the armature
Motor response has
large overshoots
High inertia low friction loads Rotate STAB anticlockwise
Reduce ramp rates
Current set too high
Motor response
has speed-related
instability
Loose tacho couplings Improve tacho coupling
Misaligned tacho Re-align the tacho
Eccentric load Balance load
Rotate STAB clockwise