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Фрагмент инструкции
220V -10.5 ohms approx. 240V -13 ohms approx. If all readings are not correct, replace elements as needed. Oven heats with switch off Mercury Contactor(s) The mercury contactor has probably malfunctioned in the closed position. If there is no voltage to the operating coil, but there is high voltage at the contactor output, replace the mercury contactor. Conveyor will not run (S/N 100-4389) Voltage Supply Check incoming voltage supply at line 1 to neutral. There should be a voltage reading of 120 VAC. If not present, check breakers. 3 Amp Fuse This conveyor fuse is located on the front panel. Replace if defective. Fuse Holder Check and/or Replace. Conveyor Switch Same procedure as for fan switch. D. C. Motor Control Board Check for 120 VAC input to D. C. control board across L1 and L2. Check the 3 amp fuse on the D. C. control board. Check for D. C. voltage at terminal F1 and F2. Voltage should be 10 VDC + 10 steady. If this voltage is not present, replace D. C. control board. Check for D. C. voltage output to the motor across terminals A1 and A2 (this voltage should be approx. 125 VDC at maximum conveyor motor speed). Impinger I -–1000 Series Service Manual -Domestic Speed Control Potentiometer This is a 0 to 400 ohm or 0 to 500 ohm, 10-turn potentiometer. WITH POWER OFF: remove the red, white, and black leads from terminals S1, S2, S3. With a digital multimeter, check the ohm reading across the red to black leads. This ohm reading should be a steady 400-ohm, or 500-ohm, through the entire 10-turn rotation of the potentiometer. Check for shorts or opens or unsteady, ohm reading, if potentiometer is defective, replace. If the potentiometer checks OK, and there is no output at terminals A1 and A2, replace the D. C. control board. Reversing Switch If there is D. C. voltage output from the motor control board, but the conveyor drive motor is not running, check the D.P.D.T. reversing switch. Conveyor Drive Motor Check the conveyor drive sprocket for tightness. Disconnect the motor, check the red and black motor leads for opens, shorts or grounds. Check the brushes for excessive or abnormal wear. Replace as needed. Reconnect motor. Test for operation. If motor does not run, replace. Conveyor will not run(S/N 4390 to Q190771000 Series) (S/N 4390Q147901200 Series) Voltage Supply Check incoming voltage supply at line 1 to neutral. There should be a voltage reading of 120 VAC. If no present, check breakers. 3 Amp Fuse. This conveyor fuse is located on the front panel. Replace if defective. Fuseholder Check and/or Replace. Fan Switch See procedure for checking on Page 20. Conveyor Switch Same procedure as for fan switch. NOTE: (Dual Belt Ovens) Dual belt ovens utilize 2 complete independent conveyor drive systems. The trouble shooting procedures are the same as single belt ovens, except that the dual belt ovens use one each of the following: one "A" D. C. control board and one "B" D. C. control board. Speed Adjustment This is a 0 to 5 K ohm, 10 turn potentiometer With Potentiometer power off, remove the red, black and white pot leads from the motor control board at terminals P1, P2 and P3. With a digital multimeter, check the ohm reading across the red lead (P3) to the black lead (P1). This reading should be 5 K ohms ± 5% as the pot is rotated from low to high. Place the meter leads on the red lead (P3) and on the white lead (P2) Rotating the pot. slowly, from low to high, the meter reading should show an even transition from O to 5 K ohms ± 5%. There should be 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. Impinger I -–1000 Series Service Manual -Domestic 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 gear box (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 w...
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