Grasso
Refrigeration Division
GRASSO SYSTEM CONTROL
01.2003/0 638660E_chapter3.doc Chap. 3 - 7
3.8 Saving changes
Press ,
Select the main menu 50 “Configuration“.
Press until the following selection appears on the display:
Configuration
accept save
( ok) ( ?)
<< I I
Use the key “save” to permanently save the configuration on the EPROM of the PLC.
) With “save” the PLC will go into STOP automatically and after 1 to 2 minutes it goes back into RUN
again. Therefore, this procedure can be performed when the PLC is in RUN only (see 4.3.). Otherwise the
following system message is displayed: “$369 S7 command error 20”.
During this time the GSC cannot respond to any action from the operator.
) Before the PLC returns to RUN do not press buttons or switch off power! Otherwise the information on
the EPROM will be lost.
3.9 Check the compressor unit’s wiring
• Remove each compressor unit sensor connector from its sensor and wait for an alarm message to appear. If
a ‘Wire failure’ alarm message does not appear for the disconnected sensor, then this sensor has not been
configured in menu 50 ‘Configuration’.
• If the alarm message appears even though no connector has been removed, check the wiring to the sensor,
or, if the sensor is not mounted, then make sure it has not been configured.
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