Problem possible cause suggested solution – LEESON FHP Series NEMA 4x Variable Speed Drive User Manual

Page 55

1. Check that line

fuses are properly
sized for the motor
being used.

2. Check motor cable

and motor for
shorts.

3. Add a blower to

cool the drive
components;
increase TQ LIMIT
settings (page 34).

1. Increase the speed

adjust
potentiometer
setting or voltage
input signal.

2. Check connections

to input. Verify that
connections are not
open.

Internal line fuse blows

Internal line fuse does
not blow, but the motor
does not run

1. Line fuses are the

wrong size.

2. Motor or motor cable

is shorted to ground.

3. Nuisance tripping

caused by a
combination of
ambient conditions
and high-current
spikes (i.e. reversing).

1. Speed adjust

potentiometer or
voltage input signal is
set to zero speed.

2. Speed adjust

potentiometer or
voltage input signal is
not properly
connected to drive
input; connections are
open.

Problem

Possible

Cause

Suggested

Solution