Gardner Denver ELECTRA-SAVER ETY99A, Руководство пользователя

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13–13–600 Page 20
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 wa-
ter 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.
The two–stage compressor package features starter
controls which start each of the motors individually.
This reduces the maximum starting currents required
by the package, while maintaining the robust charac-
teristics of full–voltage starting for the individual mo-
tors.
AUTO SENTRY OPERATION
Operation of the “AUTO SENTRY ” is dependent on
selection of an operating mode from the controller key-
pad. 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 common selected mode of
operation, as it automatically will operate the compres-
sor unit 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 dis-
played 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 13–9/10–647
Automatic restarting or electrical
shock can cause injury or death.
Open, tag and lockout main discon-
nect and any other circuits before
servicing the unit.
CONTROL DEVICES
Controller – This compressor unit features the ”AUTO
SENTRY
” controller, which integrates all the control
functions under microprocessor control. Its functions
include safety and shutdown, compressor regulation,
operator control, and advisory / maintenance indica-
tors. 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 approxi-
mately 120–125% of the unit’s full load operating pres-
sure 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.
When the relief valve opens, a stream
of high velocity air is released, result-
ing in a high noise level and possible
discharge of accumulated dirt or oth-
er debris. Always wear eye and ear
protection and stand clear of the dis-
charge port when testing the relief
valve to prevent injury.
Never paint, lubricate or alter a relief
valve. Do not plug vent or restrict dis-
charge.