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Hach sc200 - Page 22

Hach sc200
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The 24 VDC controller relays are designed for the connection to low
voltage circuits (i.e., voltages less than 30 V-RMS, 42.2 V-PEAK or
60 VDC). The wiring compartment is not designed for voltage
connections above these levels.
The relay connector accepts 18–12 AWG wire (as determined by load
application). Wire gauge less than 18 AWG is not recommended.
The Normally Open (NO) and Common (COM) relay contacts will be
connected when an alarm or other condition is active. The Normally
Closed (NC) and Common relay contacts will be connected when an
alarm or other condition is inactive (unless the Fail Safe is set to Yes) or
when power is removed from the controller.
Most relay connections use either the NO and COM terminals or the NC
and COM terminals. The numbered installation steps show connection to
the NO and COM terminals.
16 (nglisK

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