AMOT 10GEF, Руководство по эксплуатации и обслуживанию, Страница: 24 / 80

24
Electric Actuator
Rev 12 – NOV 2019 OMMG00012
preventing fluid forces in the valve from reverse – driving the actuator. Manual
override is fitted as standard, enabling valve operation without electrical
power. The manual override is automatically disengaged when electrical power
is re-applied, preventing risk of injury from the handwheel.
4.1.2 Electrical
The actuator contains the following electrical equipment:
•
Electric motor with integral bi-metallic cut-outs which disconnect the
power to the motor if the temperature exceeds 150
°
C and reset when the
motor cools to approx 97 ° C.
•
End of travel micro switches disconnect power to the motor when the end
of travel is reached.
•
Auxiliary micro switches operate just before the end of travel to provide
indication signals.
•
Torque limit micro switches disconnect power to the motor if a factory set
torque is exceeded.
•
Anti-condensation heater. Wired in when condensation can form due to
fluctuating temperatures.
•
Terminal strip for external connections.
The internal wiring for the standard actuator is illustrated in Fig 7(page26).
The external wiring is illustrated in the system wiring diagrams of Section 7
(System Integration).
4.1.3 Versions
The actuator is available in 115V ac and 230V ac, single phase. All versions
have the option of a Positioner, which is fitted to the side of the actuator (see
section 4.1.4).
The internal wiring for the various options are illustrated in Fig 7 (page 26) to
Fig 9 (page 28).
The external wiring is illustrated in the system wiring diagrams of Section 7
(System Integration).
4.1.4 Optional Positioner
An optional Positioner Unit is available to control the actuator from a 4-20mA
input signal.