RIX Industries MAN-2PS2B-N2 Page 6
Chapter 4 - Control System
4.1 System Overview
This unit has an integrated control box wired for auto stop/start capability. Pressure switches
prevent the unit from operating outside of design ranges if discharge pressure rises too high or
suction pressure falls too low. The unit is also equipped with an hour meter to log cumulative run
time.
The control box contains high voltage. Before working on electrical equipment,
take steps to ensure the system is de-energized and will remain so while work is in
progress. All circuits not known to be dead must be considered live and dangerous
at all times.
Suction pressure must be supplied to compressor before startup to keep the rod loading and/or
compression ratios within limits. Ideally the pressure in the discharge plumbing should be bled
down to the level of the suction pressure before startup. User should include provisions to allow an
unloaded start up when connecting to the compressor.
The control system is designed for two modes of operation:
1. Manual start / automatic stop
2. Auto start / stop based on both suction and discharge pressure
A HOA (Hand/Off/Auto) switch is located on the front of the control box and allows operator choice
of modes. A remote contact is installed in the control box and can tied into to an ancillary control
system for remote start/stop, signal line use, etc. If such control is desired, remove pink jumper
wired between contact blocks 1 and 3 in the control box.
4.2 Manual Operation Mode
With the selector switch in the HAND position, the compressor is in manual mode and will start
when the START pushbutton is pressed. The unit will continue to run until one of the safety
switches stops the unit. At that point the compressor will not restart until the START pushbutton is
pressed again. If any switch remains past its trip setting the compressor will not start. To manually
stop the unit, switch the HOA switch to the OFF position.
4.3 Auto Operation Mode
With the selector switch in the AUTO position the compressor will automatically start and stop
based on the signals from both the suction and discharge pressure switches. When shutdown by
either switch, the compressor will remain on standby until the pressure reverts back to the "closed"
point of the switch at which point the compressor will restart. To manually stop the unit, switch the
HOA switch to the OFF position.
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