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SECTION 4
CONTROLS & INSTRUMENTATION
GENERAL DESCRIPTION
The Gardner Denver rotary screw compressor is prewired with all controls, motor, and starter for the
voltage and horsepower at the time of ordering. It is necessary only to connect the compressor unit to the
correct power supply and to the shop air line. A standard compressor unit consists of the compressor, oil
reservoir, oil cooling system and filter, motor type as specified, NEMA 12 starter / control box, and control
components as described below.
AutoSentry
®
OPERATION
Operation of the "AutoSentry" is dependent on selection of an operating mode from the controller keypad.
Prior to starting, the STOP/RESET key must be pressed to place the controller into its READY state (as
indicated on the display). Compressor operation may then be started by pressing the RUN key. While in
any operating mode, the display will indicate the mode, and the operating light will be on.
Press the STOP/RESET key at any time to stop the compressor under normal conditions.
AUTOMATIC is the most common selected mode of operation, as it automatically will operate the
compressor unit in the most efficient manner for the demand of the air system. Refer to the controller
manual for descriptions of other modes.
WARNING
Automatic restarting or electrical shock can cause injury or death. Open,
lockout and tagout main disconnect and any other circuits before servicing
unit.
Figure 4-1 – CONTROL SCHEMATIC
303EFC797-B
(Ref. Drawing)
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