Gardner Denver AUTO SENTRY-ES+, Operating And Service Manual

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13-9-653 Page 1
SECTION 1
AUTO SENTRY – ES+ CONTROLLER
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 in the package instruction manual.
This compressor unit features the Auto Sentry ES+ 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.
AUTO SENTRY
®
-ES+ OPERATION
Operation of the controller is dependent on selection of an operating mode (described below) 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. 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. If the compressor has been running, the reservoir will first be relieved of pressure before stopping
the motor. The display will count down to zero during the normal stop.
WARNING
Automatic restarting or electrical shock can cause injury or death. Open and lock main
disconnect and any other circuits before servicing unit.
If any alternate display is on, press the operating mode key to return to the "normal" display. While operating and
running, the unit may be manually unloaded by pressing and holding the operating mode key. This unloads a running
compressor after several seconds, and will prevent loading while the key is held down. When the key is released, the
control will resume its normal operation as required.
An optional control may be wired into the controller to interrupt and restart the unit based on controls by others.
When stopped by these controls, the display indicates
"REMOTE HALT" .
In any mode, the compressor will start only if reservoir pressure is below 5 psig. The display will indicate if the control
is waiting for a reservoir blowdown, along with the remaining pressure. The controls also delay initial loading of the
compressor until a startup delay has been completed.
Figure 1-1 – AUTO SENTRY ES+ DISPLAY