Spirax Sarco PLC - Location and Identification of Components

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Location and identication of components
Front Panel
IG: Main power switch
This power disconnect device is equipped with a door locking handle that breaks the three phases of the
input voltage and allows to open the cabinet door only when is in “OFF” position.
Attention: the user must provide an external stop circuit outside of the drive circuitry. The circuit
must disable the system in case of improper operation or for unit maintenance. Failure to observe
this precaution could result in a hazardous situation or in body injury for employed personnel.
PE: Pushbutton
Emergency stop pushbutton.
L1: Led Indicator
When lit (white light) it indicates that the unit is powered.
S1: Selector
Two (lockable) position selector to select:
- Manual Control
- Automatic Control
PRB: Pushbutton
Manual reset pushbutton (after shutdown)
L2: Led Indicator
When lit (blinking red light) it indicates that the system is stopped due to intervention of one or more alarms.
BC
Measurement Unit of Total Dissolved Solids (TDS).
PLC
PLC Control Unit