Tp 26: Open Or Shorted Heater - ABB PGC2000 Operation And Service Manual

extremely high, the RTD is open. Replace the RTD. The respective probes may be tested at the
locations given below:
7. Close and tighten the Controller side door.

TP 26: OPEN OR SHORTED HEATER

It is the customer's responsibility to ensure that the area is safe and and hazard-
free, and will remain so the entire time the analyzer is open. This responsibility
includes ensuring adequate ventilation in analyzer shelter and obtaining proper
work permits, etc.
See "AIR PURGING" in Section 4 for the override function. Do not perform
override until you have read Section 4 completely and you understand and can
perform the procedure requirements.
1. Remove power from analyzer.
2. Open the Controller side door.
3. Locate heater terminal strip connections.
Service
Isothermal Oven
Programmed Temp
LSV (120 Vac)
LSV (220 Vac in, 120 V heaters)
LSV (220 Vac in, 220 V heaters)
Detector
Methanizer/Air Cleanup
4. Check for a loose connection at the defective temperature control circuit.
5. Remove one of the two wires to the defective temperature zone heater. Connect an ohmmeter
across these heater wires and measure the resistance of the heater.
6. If open, the measurement will be extremely high. Typical resistance value is 10 to 120 ohms.
Also check for shorted heater to ground. A shorted heater may have opened the heater fuse.
7. Perform Test Procedure 27 (Open Fuse to AC Conditioning Board).
8. If resistance indicates the heater is opened or shorted, replace the defective heater (see
"REPLACING HEATERS" in Section 8).
2000-OSM, F1
Temperature J49A
Zone Board Terminals
1 4 & 5
2 4 & 5
3 4 & 5
4 4 & 5
5 4 & 5
Assignment
Isothermal Oven
Programmed Temperature Oven
LSV
Detector
Methanizer/Air Cleanup
CAUTION
Temperature
Zone Board
Zone 1
Zone 2
Zone 3
Zone 3
Zone 3
Zone 4
Zone 5
J49B
1 and 2
1 and 2
1 and 2, 5 and 6
2 and 3, 4 and 5
1 and 2, 5 and 6
1 and 2
1 and 2
7-15