RITE-HITE REVOLUTION SP Installation And Owner's Manual page 22

REVOLUTION SP FAN
TROUBLESHOOTING
SCHNEIDER ELECTRIC FREQUENCY DRIVE
Problem
22
Cause
OLF Motor Overload
OLF Motor Overload
Motor winding short
Gearbox issues
Incoming / Outgoing wiring not separated
Resolution
if spikes are random and it is
acceptable for the fan to restart itself
from this fault.
Current trip was activated by
something that physically
stopped the fan movement. Check the
fan for damage. Restart if no damage
is found. Consult factory if damage is
found.
This indicates the motor is drawing
too much current. Check drive reading
on LCR. This should not read more
than FLA for the motor (3.2A@460V
or 6.3A@230V). Under normal
conditions this will not occur.
Count fan revolutions at 30 Hz. Verify
that the revolutions per minute are
approximately:
24' fan (7315 mm) = 25 rpm
20' fan (6100 mm) = 29 rpm
16' fan (4880 mm) = 35 rpm
12' fan (3660 mm) = 50 rpm
8' fan (2440 mm) = 75 rpm
If the fan rotates at a different speed
than above, check the gearbox label
to insure the wrong size blades were
not installed on the fan.
Check to insure motor wiring matches
voltage provided.
Check to make sure all blades are
locked in at the same angle, and that
one or more did not turn.
Check input fuses to make sure that
they are all good.
Disconnect wires going to motor from
control box. Measure ohms across
wires U/V, U/W, and V/W. All
readings should be within 1 ohm. If
readings are not close, you will need
to repeat this test at the moto junction
box.
Spin the fan blades by hand. Listen
for any irregular noises that could be
related to gear issues. Consult
factory if irregular noises are present.
Run incoming wire and outgoing
wiring in separate conduit a minimum
of 6" (150 mm) apart.
Pub. No. RFSP Rev. 5 - December 2010