Atlas Copco GHS 730 VSD+ - Page 65

Instruction book
6996 0227 40 65
Service plan
The built-in service timers will give a Service warning message after their respective pre-programmed time
interval has elapsed.
For specific data, see section Preventive Maintenance.
Consult Atlas Copco if a timer setting needs to be changed. The intervals must not exceed the nominal
intervals and must coincide logically. See section Modifying general settings.
Terminology
Term
Explanation
ARAVF
Automatic Restart After Voltage Failure. See section Elektronikon regulator.
Power recovery
time
Is the period within which the voltage must be restored to have an automatic restart. Is
accessible if the automatic restart is activated.
To activate the automatic restart function, consult Atlas Copco.
Restart delay
This parameter allows to programme that not all Vacuum pumps are restarted at the same
time after a power failure (ARAVF active).
Vacuum pump
element outlet
The recommended minimum setting is 110 °C (230 °F). For testing the temperature sensor,
the setting can be decreased to 50 °C (122 °F). Reset the value after testing. The regulator
does not accept inconsistent settings, e.g. if the warning level is programmed at 95 °C (203
°F), the minimum limit for the shut-down level changes to 96 °C (204 °F). The
recommended difference between the warning level and shut-down level is 10 °C (18 °F).
Delay at signal
Is the time period during which the warning signal must exist before the warning message
appears.
Delay at start
Is the time period after starting which must expire before generating a warning. The setting
should be less than the setting for the delay at signal.
Minimum stop time
Once the Vacuum pump has automatically stopped, it will remain stopped for the minimum
stop time, whatever happens with the system pressure.
Proportional band
and integration
time
The settings for the Proportional band and integration time are determined by experiment.
Altering these settings may damage the Vacuum pump. Consult Atlas Copco.