Technical_reference.pdf - 第19页

Technical Service Manual 19 Revision Dat e: August 2004 UNDER TEMPERAT URE PROBLEM. CELL T EMPERATURE RISES, BUT DO ES NOT REACH SET-POINT : 1. No power to heater: 2. Open circuit break er See: 10 3. Control SSR failure …

Technical Service Manual 18 Revision Date: August 2004

B - HEATING SYSTEM

In the following “Problems and Possible Solutions”, the most likely cause is listed first...investigate the most likely first,

then proceed to the next one in the list.

PROBLEMS AND POSSIBLE SOLUTIONS (The most likely cause is listed first)

HEATING PROBLEMS

OVER TEMPERATURE PROBLEM:

Not more than 10

C above set point and stable:

1. Temp drift from adjacent heater See: 1,2

2. Possible cell fan failure: See: 2, 3

Slow rise past set point:

1. Temp drift from adjacent heater See: 1, 2

2. Thermocouple problem in opposite heater See: 5

3. Radical recipe change See: 31

4. Short to ground in heater See: 8

Rapid rise past setpoint.

1. Latched control SSR See: 7, 12

2. Loose thermocouple wire See: 25

3. Controller Failure See: 11

4. Radical recipe change See: 31

5. DC stage of control SSR hot See: 4

Technical Service Manual 19 Revision Date: August 2004

UNDER TEMPERATURE PROBLEM.

CELL TEMPERATURE RISES, BUT DOES NOT REACH SET-POINT:

1. No power to heater:

2. Open circuit breaker See: 10

3. Control SSR failure See: 12

4. Loose wire See: 16

5. Open heater element See: 13

6. Shorted thermocouple See: 18

7. Excessive exhaust flow See: 14

8. Excessive air entering oven See: 15

9. Under voltage or Phase failure See: 19

Cell appears to stay cold:

1. Thermocouple short See: 18

2. Controller failure See: 11

3. General oven failure See: 20

Temperature drops down below set point:

1. Power loss to heater. See: 19,21

2. Control SSR failure See: 12

3. Thermocouple short See: 18

4. Controller failure. See: 11

5. Radical recipe change See: 31

RANDOM HIGH TEMPERATURES.

1. Thermocouple connection See: 25

2. Grounding. See: 28

3. Conveyor motor noise. See: 26

4. Failure of control SSR See: 12

5. AC Signal on T/C or T/C Wires See: 27

RANDOM LOW TEMPERATURES.

1. Failure of control See: 11

2. Erratic exhaust. See: 14

Technical Service Manual 20 Revision Date: August 2004

3. External air forced into heat tunnel See: 30

COLD SOLDER JOINTS

1. Conveyor speed See: 22

2. Dirty circuit board See: 23

3. Old solder paste See: 24

4. Cell fan motor malfunction See: 3