Teledyne 751H - page 28

Operation Teledyne API M751H High Performance Zero Air Generator
26 07773A DCN6833
Provision for voltage configuration is via a jumper plug (J5). All e lectrical connections
are made by quick release connectors to aid in servicing. Refer to Figure 4-4 for the
layout and to Appendix B for the interconnect and other drawings.
The 751H Control PCB is microcontroller based and provides the following functions:
Cycles the four-way valve of the Regenerative Dryer.
Cycles the water drain solenoid valve.
Cycles the relief valve in response to the pressure sensor.
Cycles the Regenerative Dryer four-way valve and momentarily opens the water
drain solenoid valve at compressor startup. This reduces the pressure at the
compressor outlet to facilitate compressor starting.
LED D13 flashes at 1 second intervals as an indication that the controller is
functioning, and a watchdog timer is enabled to prevent any power line disturbance s
from halting the processor.
Figure 4-4: Control Board Layout