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17
Multi-Function Technology
®
Wiring
ATTENTION
Master-Slave is the correct method for wiring multiple Belimo MFT actuators to
a single load. For example, you can have up to three AFX24-MFT on a single
damper jackshaft or two GMX24-MFT on a large butterfly valve.
The current Belimo solution is to mount multiple actuators onto the damper or
valve. In the past this required the installer to wire the actuators in a “master-
slave” arrangement. This was typical for the AF24-SR US actuator.
By adding more actuators you can effectively increase the torque proportional to
the minimum specified torque times the number of actuators. This is normal as
seen on the following installations.
• Large dampers or valves • Rack and Pinion style globe valves
• Large multiple section dampers • Ball or Butterfly valves
Multiple actuators mounted to one control shaft
Model Max. Qty Per Shaft Torque Generated
AFX24-MFT(-S) 3 432 in-lb
NFX24-MFT(-S) 1 90 in-lb
LF24-MFT(-S) US 1 35 in-lb
GMX24-MFT 2 640 in-lb
AMX24-MFT 1 180 in-lb
NMX24-MFT 1 90 in-lb
LMX24-MFT 1 45 in-lb
GKX24-MFT 2 720 in-lb
The wiring method for multiple actuators mounted to shafts which are not
mechanically connecting other actuators is to wire the control signal in parallel
with each actuator.
Multiple XM24-MFT95…
EXCEPTION No mechanical dual mounting of AFX24-MFT US is possible.
Electrical parallel wiring of AFX24-MFT95 is possible only for
mechanically separate applications.
SOLUTION For increased torque requirement use AFX24-MFT95 as a master
and the slave must be an AFX24-MFT. The masters feedback must
match the slaves input signal. (Both are default 2-10 VDC.)
Wiring Diagrams
1
Provide overload protection and disconnect as required.
2
CAUTION Equipment damage!
Actuators may be connected in parallel if not mechanically mounted to the
same shaft. Power consumption and input impedance must be observed.
3
Actuators may also be powered by 24 VDC.
5
Control signal may be pulsed from either the Hot (source)
or the Common (sink) 24 VAC line.
The ZG-R01 500 Ω resistor may be used.
WARNING Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may
be necessary to work with live electrical components. Have a qualifi ed licensed electrician
or other individual who has been properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical safety precautions when exposed to live
electrical components could result in death or serious injury.
#
W048_08
Wiring multiple …MFT actuators to one shaft.
All MFT actuators are wired in master-slave confi guration.
Wiring of multiple …MFT actuators on valves must be master-slave (wires 3-5).
MFT actuator confi gurations should also co-ordinate with each other.
Meaning the master input = controllers output. Master output = slave input.
Slave output = controller input.
W214_08
Controller Output Master Feedback Slave Input Slave Feedback
0.1 to 25.5 sec 2 to 10 VDC 2 to 10 VDC 0 to 5 VDC
M40035 - 05/10 - Subject to change. © Belimo Aircontrols (USA), Inc.