Lincoln Series 1000 Manuel D’Utilisation

Impinger I -–1000 Series Service Manual - International

DC Motor Control Board

Check for 120 VAC input to the control board at

terminals L1 and L2. If not present, check the

conveyor switch and wiring back to 3-amp fuse and

then back to power source if necessary. If 120 VAC

is present at L1 and L2, check the VDC output at

terminals A+ and A-. If a DC voltage is not present,

check the 4 amp and the 1 amp fuses on the

control board. Also reset and check the mini

breaker in the armature line to the gearmotor. If

120 VAC is present at terminals L1 and L2, but DC

voltage is not present at A+ and A-, providing the 1

amp and 4 amp fuses are good, replace the board.

If 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. If the

motor fails the above tests, replace motor. Remove

dust cover from the top of the motor and rotate

motor shaft to determine if there is a locked rotor or

a locked gearbox (use care so encoder disc is not

damaged).

Conveyor

Check for any mechanical misalignment or

improper adjustment. Also check for worn bearings.

The Installation and Operations Manual shows

proper conveyor belt adjustment. A conveyor belt

that is over tightened will cause excessive bearing

wear and sometimes, irregular speed.

Power Supply

Check power supply at the DC control board for the

120 VAC at board terminals L1 and L2. If voltage is

not present, check main circuit breakers.

Conveyor speed

varying or intermittent

Tach generator and DC Motor

Control Board

With the power to the DC motor control board

turned off, remove the leads from terminals T1 and

T2.Place the test leads of a digital meter on the

tach leads, turn power on, and the meter reading

should be approximately 30 to 35 VDC. This

reading should be steady within ± 0.2 to 0.3 VDC. If

this reading is not within + 0.5 VDC, place the test

meter probes on terminals A+ and A-. The meter

reading should be approximately 150 to 160 VDC

and steady within approximately 2 VDC. If the tach.

voltage is unsteady, and the board output is steady,

check the coupling for loose set screws or any type

of damage. If the coupling checks good, the tach. is

usually bad. If the board voltage output is unsteady

beyond limits, then the board is probably bad.

Always check the speed pot. Be sure it is okay

before changing a board or tach. 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. Readjustment should

always be attempted at least once before

replacement. See procedure for board adjustment

on page 65.

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 34 under "possible

cause" listing "Conveyor gear motor".