LEESON FHP Series NEMA 4x Variable Speed Drive - Manual (Page 57)

48
1. Increase MAX SPD
setting (page 33).
2. Compare motor
voltage to input
voltage; replace
motor if necessary
3. Check motor load.
Resize the motor or
drive if necessary.
1. Make sure motor is
not undersized for
load; adjust TQ LIM
setting CW (page
34
).
1. Check DIRECTION
switch connection.
2. Check reversing
circuit by shorting
TB501 (D) terminal
to (E1) terminal with
jumper wire.
3. Check motor wiring
Review motor
connections section
Motor will not reach the
desired speed
Motor pulsates or surges
under load
Motor does not reverse
1. MAX SPD setting is
too low.
2. Nominal input voltage
may be too low for
motor
3. Motor is overloaded.
1. Motor “bouncing” in
and out of torque limit.
1. Defective DIRECTION
switch connection.
2. Reversing circuit not
working properly.
3. Motor not wired
correctly for reverse
Problem Possible
Cause
Suggested
Solution