172-65316M-08 (MB12A/MB12AF/MB12B/MB12BF) 7 Oct 2021
9
Wiring Procedures (Standard)
1. Connect the ON/OFF control switch as shown in the diagram below.
•
When electricity flows through T1 and T3: As viewed from above, left rotation
for the valve fully open when stopped.
•
When electricity flows through T2 and T3: As viewed from above, right rotation
for the valve fully closed when stopped.
2. Terminals 1, 2 and 3 can be wired for the ON/OFF pilot lamp.
•
When the valve is fully open, the "O" pilot lamp is lit.
•
When the valve is fully closed, the "C" pilot lamp is lit.
3. When checking the operation of the actuator unit before installing in the piping,
keep fingers well clear of the valve section.
4. Connect the electrical ground to the terminal block mounting screw on the
actuator unit.
Wiring Procedures (St Optional Auxiliary Contact Model)
1. Connect the ON/OFF control switch as shown in the diagrams below.
•
When electricity flows through T1 and T3: As viewed from above, left rotation
for the valve fully open when stopped.
•
When electricity flows through T2 and T3: As viewed from above, right rotation
for the valve fully closed when stopped.
2. Auxiliary contact operation is shown below. The example below uses the pilot lamps.
Open: Lit when valve is fully open
Not Open: Lit when valve is not fully open
Closed: Lit when valve is fully closed
Not Closed: Lit when valve is not fully closed
3. When checking the operation of
the actuator unit before installing
in the piping, keep fingers well
clear of the valve section.
4. Connect the electrical ground to
the terminal block mounting
screw on the actuator unit.
NOTE: The auxiliary contact closed
signal is sent when the valve
reaches 5
°
before the fully
closed position. The auxiliary
contact opened signal is sent
when the valve reaches 5
°
before the fully opened position.
Control Switch
AC
Power
Source
Internal Circuitry
Control Switch
AC
Power
Source
Internal Circuitry
AC/DC
Power
Source
