Specifications

Power Entry Control Module – Direct Current (PECM-DC), Continued

The following procedure should be used for replacement of the PECM-

DC in the Maxum II Modular Oven configuration.

PECM-DC

Removal and

Installation

Step Procedure

1. Turn off power to the Maxum II at the main circuit breaker.

2. Open electronic enclosure door (using a 4mm (5/32”) Allen

wrench if necessary).

3. Remove all other cables connected to PECM-DC. These

include 24V input power, CIM power, purge control, oven

power, oven heater control, solenoids, and I

C cables. Label

each cable with its connection location as it is removed.

4. Unplug the atmospheric reference tube from the purge

switch. (Tubing connection on the bottom right side of the

PECM-DC). Refer to Figure 4-2.

5. Remove the 8 screws that secure the board to the EC, and

remove the board. Note that solenoid tubes run behind the

PECM-DC board. These should remain in the same location

with the new board.

6. On the replacement PECM-DC verify that the Purge Disable

jumper JP2 is set to match the board that was removed.

7. Install the replacement PECM-DC using the 8 screws.

8. Reattach the atmospheric reference tube from the purge

switch (tubing connection on the bottom right side of the

PECM-DC).

9. Reattach all cables to the PECM-DC. Make sure that plug

in locations and labels match. Refer to Figure 4-2.

10. After verifying all connections are correct, apply power to

the analyzer.

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