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Technical Service Manual 59 Revision Dat e: August 2004 CONVEYOR HA S NO POWER The c onvey or will not run POSSIBLE CAUSES Since the conveyor subsystem is an Electro-m ec hanical system, c heck the m echanical c omponent…

Technical Service Manual 58 Revision Date: August 2004

FOR FUTURE USE

CHECK THE “ON - OFF - STOP” CIRCUIT

The conveyor will not run. Check the On/Off/Stop circuits on the oven.

POSSIBLE CAUSES

The on/off/stop circuit consists of the E-STOP switches, K37 & K38 relays, electrical enclosure interlock switches

(optional), F50, F52, F55, and the wiring and terminal strip connections.

HINT: First check the devices physically: the E-STOP switches should be “up”, The electrical enclosure interlock switches

should be depressed, K37 & K38 should be energized, and F50, F52 and F55 should “closed”. (not tripped).

After a physical check, check the connections of the conductors, look for them to be tight and correctly connected. If any

repairs were recently been performed in this area, look for a device that may have been improperly connected when the

work was done.

Finally, check all components' electrical integrity with a volt-ohm meter for correct voltage and internal resistance:

1 E-STOP switches.

2 Electrical enclosure interlock switches (optional).

3. K 37 & K38

4. F50, F52, F55

NOTE: If F50 or F52 trips (opens), the entire oven will lose control power.

Technical Service Manual 59 Revision Date: August 2004

CONVEYOR HAS NO POWER

The conveyor will not run

POSSIBLE CAUSES

Since the conveyor subsystem is an Electro-mechanical system, check the mechanical components before replacing

electrical parts. Ensure that the belt is not hung up below the oven, or that a board is not jammed somewhere on the

conveyor. After confirming that the mechanical elements of the conveyor are in operating order, start troubleshooting the

electrical components

The transformer secondary (F52) supplies power to ALL control circuits including the DC drive module.

One of the following is likely to be responsible:

1) F50, F52.

2) DC drive module.

3) Conveyor motor.

4) RT1 (motor inrush current limiter)

5) A1 I/O board (conveyor relay A1-K12).

6) Short in the wiring.

7) F67

K37 & K38 DOES NOT OPERATE

The conveyor will not run because K37 & K38 will not energize.

POSSIBLE CAUSES

If K37 & K38 will not energize, the conveyor will not operate.

Check the following components.

1) E-STOP switches.

2) G2 24vdc Power Supply.

3) Electrical enclosure interlock switches

4) K37 & K38.

5) F50, F52.

6) F55

The on/off/stop circuit consists of the E-STOP switches, K37 & K38, F50, F52, and F55 as well as the wiring and terminal

strips connecting the components.

HINT: First check the devices physically: the E-STOP switches should be “up”. K37 & K38 should be energized, and F50,

F52 and F55 should be “closed”. (not tripped).

After a physical check, check the wire connections... look for them to be tight and correctly connected. If any repairs were

recently been performed in this area, look for a device that may have been improperly connected when the work was

done.

Finally, check all components electrically with a volt-ohm meter for correct voltage and internal resistance. NOTE: If F50,

F52 or F55 open (trips), the entire oven will lose power.

Technical Service Manual 60 Revision Date: August 2004

FOR FUTURE USE

I/O RELAY HAS FAILED OR IS OFF

The conveyor will not run because the I/O relay has failed or is off.

POSSIBLE CAUSES

If the I/O relay has failed or is turned off, two items can be checked without a meter:

1. Is the relay properly seated in the I/O board?

2. Are both ends of the cable from the controller Interface board connected?

Refer to the schematics. The conveyor relay is number A1-K12 and connects to pins PX5-14 & Px5-15 on the I/O board.

Also, check the connections from the encoder and the DC drive. These are on A1, PX9 pins 1,2, & 3 on the controller

interface board.

The oven will “alarm” and shut down if the conveyor does not run, therefore it will be necessary to enable

“Conveyor Calibration” in Oven Operation Program for trouble-shooting to take place.