OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
10
_805011_om_gsc_sp2_gbr_1_.doc
1.2.2 Lamps/ Push buttons
[Chapter 1.1.2. in user manual]
White indicator light (Running HP compressor)
This indicator lamp flashes slowly when the compressor unit is in the
“
Ready
“
state.
This lamp flashes quickly during start up of the compressor.
Once the compressor has started, the light becomes steady.
This lamp flashes quickly during the shut down operation, until the compressor drive motor is switched off.
White indicator light (Running LP compressor)
This lamp flashes during start up of the LP-compressor.
This lamp flashes quickly during start up of the compressor.
Once the compressor has started, the light becomes steady.
This lamp flashes quickly during the shut down operation, until the compressor drive motor is switched off.
Yellow indicator light (Warning)
This lamp flashes if an operating condition reaches a preset value (Warning /Pre-alarm).
Detection of this warning can be acknowledged at the operator panel. Warnings are automatically reset after the
cause has gone.
The flashing light changes over to a steady light.
This indicator light switches off again when the operating conditions are back to normal.
Red indicator light (Alarm)
This lamp flashes if an operating condition exceeds its permitted value, the machine shuts down on alarm.
This state is signalled by a red flashing light. After the alarm has been acknowledged at the operator panel, this
flashing light changes over to a steady light, as long as the alarm condition remains.
Once the cause of the alarm has been corrected, this indicator light switches off (after it has been acknowledged).
Emergency Stop button
This red button can be used to switch the compressor unit off at any time in case of an emergency. The operator
terminal controls remain functional.
