172-65316M-08 (MB12A/MB12AF/MB12B/MB12BF) 7 Oct 2021
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Wiring Procedures (Optional Relay Model (Energize to Close Type))
1. Connect the ON/OFF control switch as shown in the diagrams below.
•
When the control switch is ON: As viewed from above, left rotation for the
valve fully closed when stopped.
•
When the control switch is OFF: As viewed from above, right rotation for the
valve fully open 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.
NOTE: Excessively long controller wiring may lead to malfunction due to induction voltage. If
this occurs, install a relay near the motorized valve; use the relay contact for the
controller or install a resistor between terminals T1 and T3.
Contact TLV for details.
Control Switch
AC
Power
Source
Internal Circuitry
