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8
5.3 Setting the DIP switch for the emergency setpoint and the
clock back-up battery
Carefully lift the housing cover off the side, using your fingers.
¼ Selection of the emergency setpoint for the cold store
temperature:
This will be activated if the data in the memory is lost and alarm
AL1 is activated. This sets all program parameters to the preset
value. The cold store temperature setpoint can be preset to +4 °C
or –18 °C, as desired. This ensures that chilling systems with
temperatures above zero do not freeze and deepfreeze
installations do not thaw.
DIP switch 1 (left), Pos.: off (bottom): Setpoint value at +4 °C for
emergency operation.
Advisable for chilled storage
(= Preset value).
Pos.: on (top): Setpoint value at –18 °C for
emergency operation.
Advisable for deepfreezers.
For PCR-300 RC only:
The back-up battery must be switched on when the controller is started
up so that the real-time clock keeps operating if there is a power failure.
Activation of the back-up battery:
DIP switch 2 (right), Pos.: off (bottom): Battery switched off when
controller is stored or in transit. (The battery is
switched off when the controller is delivered;
exhaustive discharge monitoring).
Pos.: on (top): Battery activated.