User manual
2920 1456 03
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1.2 Protecting the compressor
1.2.1 Shut-down and fan motor overload
If the compressor element outlet temperature exceeds the programmed shut-down level, the
compressor will be stopped. This will be indicated on the control display.
The compressor will also be stopped in case of overload of the fan motor.
1.2.2 Shut-down warning
If the compressor element outlet temperature exceeds a programmed value just below the shut-down
level, this will also be indicated to warn the operator before the shut-down level is reached.
1.2.3 Warning
A warning message also appears if:
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On water-cooled compressors, the cooling water outlet temperature exceeds the warning level.
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On Full-Feature compressors, the dewpoint temperature exceeds the warning level.
1.3 Service warning
A number of service operations are grouped in plans (called Service plans A, B and C). Each Service
plan has a programmed time interval. If a time interval is exceeded, a message will appear on display
(12-Fig. 2.1) to warn the operator to carry out the service actions belonging to that plan.
1.4 Automatic restart after voltage failure
The regulator has a built-in function to automatically restart the compressor if the voltage is restored
after voltage failure. For compressors leaving the factory, this function is made inactive. If desired,
the function can be activated. Consult Atlas Copco.
Warning
If activated and provided the module was in the automatic operation mode, the compressor will
automatically restart if the supply voltage to the module is restored within a programmed time
period.
The power recovery time (the period within which the voltage must be restored to have an automatic
restart) can be set between 10 and 3600 seconds or to Infinite. If the power recovery time is set to
Infinite, the compressor will always restart after a voltage failure, no matter how long it takes to restore
the voltage. A restart delay can also be programmed, allowing e.g. two compressors to be restarted
one after the other.
