19
Blower speed control(s) at minimum or low-
speed setting (model VHVA-Series only)
No sound or noise coming from blower(s)
Conveyor belt
doesn't move, or it
moves unevenly.
Unexpected speed
changes.
Blower motor(s) "jammed"
Blower motor(s) "stalled" (not running
when Main Switch ON)
If all previous tests verify power and
control to gearmotor, replace gearmotor.
4. Verify wire connectors from power
supply to gearmotor (2 wires
w/connectors). If power supply doesn't
5. Verify potentiomter connections to
gearmotor (3 wires w/connectors). If
speed doesn't change when knob is
turned, test with spare pot before replacing
original pot.
Remove source(s) of obstruction.
CAUTION: TURN OFF MAIN CIRCUIT
BREAKER BEFORE REACHING INTO
BLOWER WHEEL COMPARTMENT.
SERIOUS INJURY COULD RESULT
OTHERWISE!!
Turn speed knob(s) clockwise to increase
air flow
Turn both blower speed controls to
minimum, then adjust each one separately
to hear for sound changes which indicate
air movement. (model VHVA-Series only)
THE PROBLEM
THE CAUSE
THE SOLUTION
No air or not
enough air coming
from blower(s)
Verify correct rotation - counterclockwise
when standing in front of machine.
Remove the front door, the conveyor belt
assembly, and both upper and lower air
return shilelds. Turn the Main Switch ON
and OFF one time to start the blowers, and
observe the rotation as the blowers slow
down to stop. If rotation is incorrect, (three-
phase motors only), then two of the three
power wires need to be swapped
@ the
terminal block
to reverse direction of
rotation. Re-check with same method.
Blower(s) turning backwards.
(Applies to models VH-, VHVA Three-
phase units, and VHVA Single-phase
units. Does NOT apply to VH Single-
phase units.)
(Continued)
Conveyor gearmotor failed
(Continued)
Turn Main Switch OFF for at least 15
seconds, then turn it ON again. This
resets speed controls. If this doesnt help,
turn OFF Main Circuit Breaker for
, then turn it ON again.
1
Minute
Summary of Contents for VH1620E
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