Spring Return Rotary Fail-Safe Actuator

Communicative rotary actuator with fail-safe for ball valves

• Torque motor 2.5 Nm
• Nominal voltage AC/DC 24 V
• Control modulating, communicative 2...10 V variable
• Position feedback 2...10 V variable
• Conversion of sensor signals
• Deenergised closed (NC)
• Communication via Belimo MP-Bus

Product features

Mode of operation

Conventional operation:
The actuator is connected with a standard modulating signal 0...10 V. The actuator moves the valve to the operating position at the same time as tensioning the return spring. The valve is turned back to the fail-safe position by spring force when the supply voltage is interrupted.
Operation on Bus:
The actuator receives its digital positioning signal from the higher level controller via the MPBus and drives to the position defined. Connection U serves as communication interface and does not supply an analogue measuring voltage.

Converter for sensors

Connection option for a sensor (active sensor or switching contact). The MP actuator serves as an analogue/digital converter for the transmission of the sensor signal via MP-Bus to the higher level system.

Parametrisable actuators

The factory settings cover the most common applications. Input and output signals and other parameters can be altered with the Belimo Service Tool MFT-P.

Simple direct mounting

Simple direct mounting on the ball valve with only one screw. The mounting orientation in relation to the ball valve can be selected in 90° steps

High functional reliability

The actuator is overload protected, requires no limit switches and automatically stops when the end stop is reached.

Home position

Factory setting: Arrow cw (clockwise).

Adaptation and synchronisation

An adaptation can be triggered manually by switching the direction of rotation switch from the left to the right twice within 5s or with the PC-Tool. Both mechanical end stops are detected during the adaptation (entire setting range). Automatic synchronisation after actuating the direction of rotation switch once is programmed. The synchronisation is in the home position (0%).
A range of settings can be adapted using the PC-Tool (see MFT-P documentation)