OPERATING INSTRUCTIONS
GRASSO SYSTEM CONTROL
FOR TWO STAGE CHILLER/ PACKAGES WITH SCREW
COMPRESSORS
18
_805011_om_gsc_sp2_gbr_1_.doc
1.3
System description GSC
[Chapter 4. in user manual]
The system LEDs are located on the front of the GSC. These system LEDs provide information about the status of
the controller.
1.3.1 Explanation of the system LED
[Chapter 4.1. in User Manual]
The position of the system LED is given in Chapter figure 3, page 11.
Meaning of the status and error displays
Display
Meaning
Explanation
SF (red)
C7-CPU-centralised fault
Lights up for:
—
Hardware errors,
—
Firmware errors,
—
Programming errors,
—
Parameterising errors,
—
Computational errors,
—
Time errors,
—
Faulty internal memory storage,
—
Battery failure or the standby supply is missing while MAINS
ON,
—
Peripheral error in the internal peripheral functions.
Further information about the malfunction that has occured can
be read out of the diagnosis memory using the PG.
BATF (red)
Battery error
Lights up,
if battery
—
does not have enough voltage,
—
is defective,
—
is missing.
DC5V (green) Voltage supply for C7
lights up
, if the internal DC
5V supply is OK.
FRCE (yellow) Force-order
lights up,
if a Force-order is active.
RUN (green)
Operating state RUN of the C7-
CPU
lights up
, if the C7 CPU application program is running.
flashes
(2Hz) during the C7 CPU start up (the STOP lamps also
lights up; after the STOP lights go off, the outputs are released).
STOP (yellow) Operating state STOP of the C7
CPU
lights up
, if the C7 is not processing a CPU-application program.
flashes
at 1-second intervals, if C7 CPU general reset (MRES) is
required.
SF-IM (red)
Switching module - centralised
fault
lights up
, if the connection between C7 and the extension rack
is interrupted.
