GEA Grasso System Control Operating Instructions Manual page 16

The operating status provides information about the compressor unit.
The following status messages are possible:
Initialisation
Start to start HP
Oil drain
Standby
No start release
Force to Min HP
Starting HP
Running
Psuc Limitation
Pdis Limitation
Imot Limitation HP
Text Limitation
Toil Limitation
Stopping HP
Compressor off
Stop to start timer
Failure
Pump by itself
Pull down Pinterm
16
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
Initialisation of the control after switching on the power supply or after saving the
settings (RAM → ROM)
A switch on frequency limitation of the HP compressor drive motor is still active
A switch on block period is active, the oil pump has run too long by itself
(Minimum position was not reached during start or stop procedure)
Compressor unit/ chiller ready for switching on, but one or more starting conditions
are still not fulfilled e.g. process variable still below set point
The controller is waiting for an external signal to enable the start of the unit
Starting procedure issued, slide moves to minimum position (HP)
Compressor motor has been started, but the switchover to "Delta" has not yet taken
place or the startup has not yet been completed.
Compressor motor running in "Delta" or startup has been completed. Package/ Chiller
in operation.
A capacity limitation is active (suction pressure too low), "reduce output" solenoid
valve is opened.
A capacity limitation is active (discharge pressure too high), "reduce output" solenoid
valve is opened.
A capacity limitation is active (HP motor current too high), "reduce output" solenoid
valve is opened.
A capacity limitation is active (external temperature too low), "reduce output"
solenoid valve is opened.
Oil temperature too high, "refrigerant injection" is enabled (optional)
The compressor unit/ chiller has received a shutdown command, the capacity slide is
moved towards its minimum position (HP)
The compressor has switched off
Start delay after each stop
A failure has occurred, which is still active.
The minimum position was not reached during switch on or off procedure. The oil
pump continues to try to adjust the control slide in the min direction. After the oil
pump run by itself the oil block period becomes active.
The intermediate pressure is drawn off down to the switch on pressure (release of
the LP compressor)
_805011_om_gsc_sp2_gbr_1_.doc
OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
COMPRESSORS