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13-10-614 Page 23
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 (and to the appropriate water
supply if water cooled). 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 an operating mode
key.
AUTOMATIC is the most commonly selected mode of operation, as it will operate the compressor unit
automatically in the most efficient manner for the demand of the air system.
Once operating, the mode may be changed at any time by pressing a key, and the selected mode will be
displayed in the lower right corner of the message window. Press the [STOP/RESET] key at any time to
stop the compressor under normal conditions.
Detailed instructions for the controller are found in the manual 13-9-653.
WARNING
Automatic restarting or electrical shock can cause injury or death. Disconnect,
lockout and tagout the unit from the power supply and any other circuits before
servicing unit.
CONTROL DEVICES
Controller
- This compressor unit features the “AutoSentry" controller, which integrates all the control
functions under microprocessor control. Its functions include safety and shutdown, compressor
regulation, operator control, and advisory/maintenance indicators. The keypad and display provide the
operator with a logical and easily operated control of the compressor and indication of its condition. The
controller is factory adjusted for the compressor package, but allows tuning for specific applications.
Relief Valve
- A pressure relief valve(s) is (are) installed in the final discharge line and set to
approximately 120-125% of the unit’s full load operating pressure for protection against overpressure.
Periodic checks should be made to ensure its (their) operation.
The relief valve should be tested for proper operation at least once every year. To test the relief valve,
raise the system operating pressure to 75% of the relief valve set pressure and manually open the valve
with the hand lever. Hold the valve open for a few seconds and allow it to snap shut.
Summary of Contents for AUTO SENTRY EAU99G
Page 11: ...13 10 614 Page 4 Figure 1 4 PACKAGE DRIVE MOTOR AIR FILTER 201EAU797 Ref Drawing...
Page 14: ...13 10 614 Page 7 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 15: ...13 10 614 Page 8 DECALS 216EAQ077 217EAQ077 222EAQ077 221EAQ077 208EAQ077...
Page 37: ...13 10 614 Page 30 Figure 4 7 CONTROL SCHEMATIC COMPRESSOR AT FULL LOAD 206EAU797 A Ref Drawing...
Page 41: ...13 10 614 Page 34 202EAU546 D Ref Drawing Page 2 of 2...
Page 43: ...13 10 614 Page 36 205EAU546 D Ref Drawing Page 2 of 2...
Page 47: ...13 10 614 Page 40 Figure 5 3 FLOW DIAGRAM 210EAU797 A Ref Drawing...