Quincy Compressor QOFT 20 Instruction Book page 22

Protecting the unit
Shutdown
Several sensors are provided on the unit. If one o f the measured signals exceeds the
programmed shutdown level, the compressor will be stopped.
Example: If the element outlet temperature exceeds the programmed shutdown level, the unit will
be stopped. This will be indicated on the display of the controlle r.
The unit will also be stopped in case of overload of the drive motor or fan motor .
Before resetting a warning or shutdown message, always solve the problem.
Frequently resetting these messages without remedying may damage the unit.
Shutdown warning
A shutdown warning level is a programmable level below the shutdown level.
If one of the measurements exceeds the programmed shutdown warning level, a message will
appear on the display and the general alarm LED will light up to warn the operator before t he
shutdown level is reached.
The message disappears as soon as the warning condition disappears.
Service warning
A number of service operations are grouped as a Service Plan. Each Service Plan has a
programmed time interval. If the service timer exceeds a programmed value, this will be indicated
on the display to warn the operator to carry out the service actions belonging to that Service Plan.
Automatic restart after voltage failure (ARAVF)
The controller has a built-in function to automatically restart the compressor when the voltage is
restored after voltage failure. For units leaving the factory, this function is made inactive. If
desired, the function can be activated. Consult your supplier.
If the function is activated and provided the regulator was in the automatic operat ion
mode, the unit will automatically restart if the supply voltage to the module is
restored. The ARAVF label (see section Pictographs) shall be glued near to the
controller.
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Instruction book
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