9.0 OPERATING INSTRUCTIONS
IRN37–160K–CC & IRN50–200H–CC & IRN75–160K–2S & IRN100–200H–2S
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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, if the blowdown
mode is set to off, the compressor will stop. However
if the blowdown mode is set to on, the compressor will
open the blowdown valve 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 restart once
the system pressure falls below the target pressure.
Stop sequence
The compressor can be stopped by a local or remote
stop, a shutdown due to an alarm 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 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.
Blowdown mode
If the blowdown mode is set to on, the compressor will
open the blowdown valve anytime that it stops. This will
release pressure from the airend and separator tank.
If the blowdown mode is set to off, the blowdown valve
will remain closed when the compressor stops due to an
automatic stop
Blower control N37/75K–1S, N50/100H–1S
The blower will run when the compressor is running. If
the blower is stopped, it will start with the compressor.
The blower may run for a period of time after the
compressor stops. This will be done to limit the number
of blower starts to 15 per hour. If the compressor stops
due to an alarm or a local or remote stop, the blower will
stop with the compressor.
Blower control N90/160K–1S, N125/200H–1S &
N75/160–2S, N100/200H–2S
The blower speed varies in some conditions to assist in
controlling 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.
Stopping the machine in an emergency
If the machine has to be stopped in an emergency
DEPRESS THE EMERGENCY STOP BUTTON
LOCATED UNDERNEATH THE INSTRUMENT
PANEL.
This will over–ride the normal unload/stop button and
will immediately stop the machine.
Restarting after an emergency
If the unit has been switched off because of a machine
malfunction, identify and correct the fault before
attempting to restart.
If the unit has been switched off for reasons of safety,
ensure that the machine can be operated safely before
restarting.
Refer to the PRIOR TO STARTING and START
SEQUENCE instructions earlier in this section before
restarting the machine.