ABB PGC2000 Operation And Service Manual page 249

2. Check air pressure for correct adjustment. Perform Test Procedure 1 (Carrier, Makeup, and
Utility Gas Supplies).
3. Check all temperature control parameters. Perform Test Procedure 30 (Checking Temperature
Table Values), and correct any errors.
4. Access the Manual Temperature Control Mode by performing steps 1 to 3, 8 and 9 of Test
Procedure 30 (Checking Temperature Table Values). Change Zone 2 set point to 220 and rate
to 50.
5. Monitor the actual zone 2 temperature. When it reaches 100 degrees, change the set point to the
normal initial set point value and rate to 0.1.
6. You should hear the coolant solenoid valve operate and hear a sudden discharge of air into the
programmed temperature oven.
7. If you do not hear the solenoid valve operate, override the X purge using the procedure given in
Section 4. If you hear the solenoid valve switch, go to step 23.
8. Open electronics housing door. LED DS8 should be illuminated. If not, replace temperature
control board.
9. Access the Manual Temperature Control Mode by performing steps 1 to 3, 8 and 9 of Test
Procedure 30 (Checking Temperature Table Values). Change zone 2 set point to 220 and rate
to 50.
10. Connect voltmeter leads across J42D terminals 1 and 2 and check for the presence of zero VAC.
11. Monitor the actual zone 2 temperature. When it reaches 100 degrees, change the set point to the
initial set point value and rate to 0.1.
12. Connect voltmeter leads across J42D terminals 1 and 2 and check for the presence of 115 VAC.
If voltage is present, replace the solenoid valve.
13. If no voltage is measured between J42D terminals 1 and 2, check for presence of 115 VAC
between J42C terminals 1 and 2.
14. If voltage is not present at J42C terminals 1 and 2, check for 115 VAC at J46A terminals 1 and 2.
15. If voltage is present at J46A terminals 1 and 2, shut off power and replace motherboard.
16. If voltage is present at J46D terminals 1 and 2, remove power from the analyzer.
17. Disconnect the solenoid valve coil wires from J42D terminals 1 and 2 and connect an ohmmeter
between the solenoid valve wire leads. The solenoid coil will have a small resistance. Check
each lead to chassis ground. If shorted to ground or questionable, replace solenoid valve or coil.
Inspect leads for bare insulation that could contact chassis or other grounded part and make
necessary repairs.
18. Disconnect the solenoid valve coil wires from J42D terminals 1 and 2 and connect an ohmmeter
between solenoid valve wire leads. If the coil resistance is extremely high or infinity, replace the
solenoid valve or coil and fuse. Repeat procedure in step 17.
19. Apply power to the analyzer.
2000-OSM, F1 7-35