Low Profile – 1600 Advantage Series Service Manual – International
10
gear motor and the motor does not run, first check
the mini breaker and then the conveyor.
Refer to the next possible cause. Check
the leads to the motor for evidence of
any shorts or opens , and each lead to
ground. Check motor brushes . From
the top of the motor, rotate motor shaft
to determine if there is a locked rotor
or a locked gearbox (use care so magnet
and Hall Effect sensor board are not
damaged). Replace motor as needed.
Conveyor Check for any mechanical misalignment.
Also, check for worn bearings.
A conveyor belt that is over tightened
will cause excessive bearing wear and
sometimes, irregular speed.
Conveyor speed varying Power supply Check power supply at the D.C. control
or intermittent board for supply voltage at board terminals
L1 and L2.
Motor control board Place the test meter probes on terminals
A+ and A-. (with speed potentiometer
set to maximum speed – approximately
2 min.). The meter reading should be
approximately 100VDC(±3%), if
voltage is not steady within limits,
then the board is usually bad.
Always check the speed potentiometer,
be sure it is OK before changing a
control board. This test is not always
100% accurate as this test is not
performed at operating speeds, However,
this test is the best method currently
available.
D.C. Gearmotor If the D.C. control board is steady,
then the problem may be the motor or
gearbox. Check the brushes in the
motor for excessive arching or
unusual wear. Check the motor and
gearbox from instructions located on
page 9 under “possible cause”
listing “conveyor gear motor”
Magnet Check to insure that the magnet
(cemented to shaft of conveyor drive
motor) has not been damaged, or come
loose from the motor shaft. Replace
as needed.
Hall Effect Check for any physical damage to
Sensor hall effect sensor (mounted on
conveyor drive motor). Check all
wiring and connections for tightness
and proper location. Replace as needed.
Connect new hall effect to system
and check for steady operation.
Temperature display Display transformer Measure the transformer primary
inoperative for supply voltage input. If voltage is
not present, trace wiring back to the
fan relay. If voltage is present,
measure the secondary output of the
transformer. Voltage across terminals
1-3 should be 12-15VAC. Terminals
1-2 and 2-3 should be ½ the voltage
reading from terminals 1-3. If the above
