EN
EN-10
80446339 Rev E
OPERATING INSTRUCTIONS FOR VARIABLE SPEED DRIVE (VSD)
BASIC OPERATION
NOTICE
The language and compressors of measure displayed on the controller
will be preset before leaving the factory. If these are required to be
changed, contact your local Ingersoll Rand service provider.
PRIOR TO STARTING
Check that the coolant level is at least visible in the center of the sight glass
and add coolant if necessary. Refer to the maintenance procedures for setting
the correct level.
Ensure that the discharge air isolation valve is open. Switch ON the main
electrical isolation switch. The control panel will illuminate, indicating that
the line and control voltages are available.
The contrast of the SG controller display may be adjusted by turning the
small screw which is on the right hand side of the controller when accessed
through the starter cabinet door.
INITIAL CHECK SEQUENCE
The controller will perform an initial check sequence if the compressor
receives initial power to the controller or has experienced an trip reset. While
the initial check sequence occurs, the controller will display a “Checking
Machine” message.
During the initial check sequence, the controller will check the control system
for proper operation. During this time, if any items are found inoperative, a
trip will occur and the compressor will not start.
After completion of the initial check sequence, the controller will then display
“READY TO START’. This process should be completed within 10 seconds.
START SEQUENCE
The compressor will initially start by the operator pressing the local start
button or receiving a remote start command. The compressor will start
loaded and will ramp up the motor speed to its minimum speed. Once the
minimum speed has been achieved, the compressor will begin to control
pressure by using its speed regulation. When the system pressure reaches
the target pressure, the compressor will start to slow. If the system pressure
rises to the immediate stop pressure setpoint the compressor will stop. If
the system pressure rises to the auto stop setpoint and the compressor is at
minimum speed, the compressor will stop.
NOTICE
During the first startup of the compressor, check for the proper
direction of rotation of the dryer condenser fan. If the fan is not
rotating in the direction indicated by the rotation arrow decal, reverse
two of the wires at the main power supply or at the contactor in the
package starter box. Perform the proper stop sequence and lockout/
tagout the main electrical supply before making changes to the
wiring.
STOP SEQUENCE
The compressor can be stopped by a local or remote stop, a shutdown due
to a trip, or an emergency stop. All of the above conditions will cause the
compressor to stop immediately, except the local or remote stop. A local or
remote stop will open the blowdown valve and the compressor will run for
up to 10 seconds or until the pressure in the separator tank falls to 2.4 bar
(35 psi) before stopping. The compressor will stop if the system pressure
reaches the automatic stop or immediate stop pressure setpoints. However,
if the compressor stops for this reason, it will automatically restart when the
system pressure falls below the target pressure.
NOTICE
If the compressor has to be stopped in an emergency depress the
emergency stop button located underneath the instrument panel.
WARM UP MODE
A warm up cycle occurs when the compressor’s airend discharge temperature
doesn’t reach the required warm up temperature (82°C/180°F) for two
consecutive operational cycles. On a warm up cycle, instead of stopping,
the compressor will continue to run with the blowdown valve open.
The compressor will run in a fixed speed mode, at minimum speed. The
blower will operate at minimum speed. The compressor will run like this
for approximately five minutes. During a warm up cycle, the controller will
display the message “Warm Up Mode”. If the pressure falls during this time
period, the compressor will return to normal operation.
BLOWER CONTROL
The blower speed varies in some conditions to assist in controlling the after-
cooler approach temperature and the coolant injection temperature. The
blower motor has its own variable speed drive and will ramp up and down as
the compressor starts and stops.
EMERGENCY STOPPING
If the compressor has to be stopped in an emergency
press the emergency
stop button located underneath the instrument panel.
This will over-ride the normal unload/stop button and will immediately stop
the compressor.
RESTARTING AFTER EMERGENCY STOPPING
If the compressor has been switched OFF because of a compressor
malfunction, identify and correct the fault before attempting to restart.
If the compressor has been switched OFF for reasons of safety, ensure that
the compressor can be operated safely before restarting.
Refer to the
PRIOR TO STARTING
and
START SEQUENCE
instructions earlier in
this section before restarting the compressor.
RELEASED 01/Nov/2018 12:06:37 GMT
