Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur télécharger pdf (Page 36)

Impinger I -–1000 Series Service Manual - International

Speed Adjustment

Potentiometer

This is a 0 to 50k ohm, 10 turn potentiometer.

WITH POWER OFF: remove the 3-pin

potentiometer cable plug from the motor control

board. With a digital multimeter, check the ohm

reading across the red lead to the black lead. This

reading should be 50k ohms ±5% as the

potentiometer is rotated through its 10-turn rotation.

Place the meter leads on the red lead and white

lead. Rotating the potentiometer slowly, from low to

high, the meter should show an even transition

from 0 to 50k ohms ±5% through the 10-turn

rotation of the potentiometer. There should be no

dead or open spots through the 10 turns of the

potentiometer. Check all three leads to ground.

There should be no continuity to ground. If any of

the above checks fail, replace the potentiometer.

Conveyor Motor

(Stepper)Control

NOTE: if the conveyor drive motor becomes

jammed or begins to run at an uncontrolled speed,

the conveyor motor will stop running. To reset, turn

off the conveyor switch, wait 10 seconds, turn the

conveyor switch on. If the motor does not run after

attempting re-set, check for 2 to 29 VAC across the

motor terminal 1 to 2 and 3 to 5 on the conveyor

motor control. If voltage is not present at both sets

of terminals, replace control.

Conveyor Drive

(Stepper)Motor

Check the drive sprocket on motor output shaft to

insure that is tight. Check motor windings;

measurements should be approximately 2 ohms.

Terminal 1-5, 2-6, 3-7, 4-8. WITH POWER OFF:

Turn the motor shaft to check for jammed gear box.

If motor shaft will not turn, replace conveyor

drive(stepper) motor.

Time/Temp Display

inoperative

12.6 VAC Power Supply Measure the transformer primary for a nominal 120

VAC input. Measure the secondary voltage output

which will be 12.5 to 15 VAC normally. Recheck

secondary output at rear of Time/Temp Display.

Terminals 1 to 3 should read 12.5 to 15 VAC.

Terminals 1 to 2 and 2 to 3 should be 1/2 of the

reading across 1 to 3. If you do not get the above

secondary readings, replace the transformer. If 120

VAC primary voltage is not available, refer to the

schematic and trace circuit for incoming power

failure. There is a 4-amp fuse in each red

secondary lead. These may be jumpered (for test

only) to determine if they are defective or

intermittent.

NOTE (Dual Belt Ovens) Dual belt ovens utilize a double pole double throw

switch, which allows either of the optical encoders

to be read from a single Time/Temp. Display.

Check the switch and replace as needed.

Temp Display out or

inaccurate

NOTE: Time/Temp displays

use two types of temperature

sensor, Thermistor Probe - 2

yellow wires, Thermocouple

Probe - 1 red wire and 1

white wire

Place your pyrometer thermocouple into the center

between fingers T2 and T3 in the oven. Disconnect

the yellow tipped thermistor leads from the

time/temp. terminals 9 and 10. Measure the

resistance of the thermistor probe.

Thermistor Probe See chart on page 72 for proper resistance

readings. Inspect the thermistor bulb for its proper

location in its spring holder. Check for shorts in

leads where they enter the sensor bulb. Also check

each thermistor lead for short to ground.

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Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur Page 36

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