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3 Installation
16
3.4
Connection
Note
Be sure to use the electric wire of 0.75 mm
2
to 2 mm
2
(AWG18 to 14) for wire connection at the
terminal board.
3.4.1
Connection of alarm contact output
z
Contact capacity is within 125 V 3 A AC, or within 24 V 3 A DC.
z
When the connected equipment generates noises, use a varistor or a noise killer.
Connect the alarm contact outputs as follows.
z
NO terminal is a normal open terminal.
Contact is closed when the set alarm condition occurs.
z
NC terminal is a normal close terminal.
Contact is closed when the set alarm condition is reset.
Note
z
C1 (terminal No. 1) and C2 (terminal No. 4) are independent and insulated.
z
To output an alarm when the power is shut off, connect an alarm output to C1-NC1 terminal.
CAUTION
To connect a load beyond the contact capacity or use inductive load (such as a motor, or pump), be
sure to use a power relay whose rating is higher than the load.
When the instrument is turned off, the C-NC contact is shorted. Be careful when connecting a load.
C1
NO1
NC1
C2
NO2
RLY1
RLY2
RLY1: Alarm contact output 1
RLY2: Alarm contact output 2
Contact output
RLY2
NO1: Normal open
NC1: Normal close
NO2: Normal open
RLY1
C1
NO1
NC1
C2
NO2