Lincoln Impinger II - Advantage Series - Manual (Page 15)

Impinger II –Advantage Service Manual - Domestic 15
Speed Adjustment
Potentiometer
This is a 0 to 10 K ohm, 1 turn potentiometer. With
power off, remove the black and white pot leads
from the motor control board at terminals P1, P2.
Place the meter leads on the black lead (P2) and
on the white lead (P1). Rotating the pot., slowly,
from low to high, the meter reading should show an
even transition from 0 to 10 K ohms ± 5%. There
should be no dead or open spots through out the 1
turn of the pot. Check both leads to ground. There
should be no continuity to ground. If any of the
above checks fail, replace the pot.
DC Motor Control Board Check for 208/240 VAC input to the control board at
terminals L1 and L2. If not present, check wiring
back to the oven fan switch. If voltage is present at
L1 and L2, check both fuses on control board (8A
line and 1A armature), check the VDC output at
terminals A+ and A-. If voltage is present at
terminals L1 and L2, and DC voltage is present at
A+ and A-, but motor does not run, check gear
motor as follows.
Conveyor Gear Motor If DC voltage is present at A+ and A- 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 gear box (use care so magnet and H.S.
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 or
intermittent Power Supply Check power supply at the DC control board for the
208/240 VAC 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 minutes), the meter reading
should be approximately 100 VDC (± 3%), if voltage
is not steady within limits, then the board is
probably bad. Always check the speed pot. Be
sure it is okay before changing a 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.
DC Gearmotor If the DC control board is steady, then the problem
may be the motor or gearbox. Check the brushes
in the motor for excessive arching and/or unusual
wear. Check the motor and gearbox from
instruction located on page 14 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 motor shaft. Replace as needed.