Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur télécharger pdf (Page 37)

Impinger I -–1000 Series Service Manual - International

Thermocouple Probe Place your pyrometer thermocouple into the center

between fingers T2 and T3 in the oven. For ovens

with Mechanical Measure D.C. millivolts at

Thermostat terminals 9 and 10 on the time/temp

display. See thermocouple chart on page 59 for

proper readings. Replace thermocouple if proper

readings not achieved. If readings are correct on

the thermocouple, replace time/temp display.

For ovens with

Electronic Thermostat

Connect temperature meter to thermocouple at

terminals 9 & 10 on back of the time/temp display.

(Be sure to maintain proper polarity on

thermocouple connections.) Compare actual oven

temperature with the readings at the time/temp

display. If the temperature readings match,

recalibrate or replace time/temp display. If the

readings do not match, replace thermocouple

probe.

Erratic time/temp

display

If strange or unusual behavior is experienced such

as a rolling of numbers, lock up at a given number,

first check for a display circuit lock up. This can be

caused by a voltage spike or surge. To eliminate

this condition remove power from the time/temp.

display by shutting off the main fan switch, or if

display stays on, (older models) circuit breaker

interruption may be required. This should eliminate

the problem. If the problem continues, jumper the

two fuses in the red wires leading from the 12.6

VAC transformer to the display. If this does not

solve the problem, it may be coming in through the

commercial power lines. Suggest that customer

contact his power company for evaluation.

Temp Display

inaccurate erratic, or

inoperative

Perform the power supply check, the thermistor

probe check, and then perform the time/temp

simulator test. Refer to page 72 for instructions.

Remember, when using the time/temp simulator,

remove all the leads from the back of the display

except the 3 power leads. After completion of this

test and if reinstalling back into the oven, the dip

switches must be reset for oven operation.

Time display

inaccurate erratic, or

inoperative(S/N

Q4615-Q14970) 1000

Series(S/N Q4615-

Q14790) 1200 Series

Perform all checks as in the above evaluation. If

the time check is okay, refer to the next section

optical encoder.

Optical Encoder The above time/temp test should have already

been performed. Remove dust cover from the

gearmotor and inspect the coupling and encoder

disc. The coupling set screws should be tight and

not slipping on the motor shaft or the tach.

generator shaft. The encoder disc should be firmly

attached to the coupling and not warped. Check the

positioning of the optical encoder disc. The disc

should not be touching the optical encoder

assembly and the encoder assembly should be

mounted so it is squarely facing the coupling shaft.

This is to allow the infrared beams to be broken by

the encoder disc. If all this is okay, then replace the

optical encoder assembly.

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Lincoln Impringer Conveyor Oven 1200 Manuel d'utilisateur Page 37

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