0-003-3263-2 (EN)
2 (6)
The actuator
The brushless DC-motor of the actuator
turns a screw via a gear wheel. The motor
receives a control signal from a controller.
The screw gets a linear movement which
moves the stem of the valve.
In case of power loss, the spring will bring
the actuator totally up (“SRSU” models) or
totally down (“SRSD” models)
Control signal
M700 can either be controlled by an
increase/decrease signal or by a variable
direct voltage.
If an increase/decrease signal is used,
the actuator normally moves inwards on
an increase signal and outwards on a
decrease signal, see Settings.
Manual operation
Due to the safety function implemented,
manually operating the actuator is only
possible when power off using a 10 mm
wrench (see figure 2).
Position feedback
Forta actuators are equipped with a 2–10
V DC position feedback signal, where 2 V
always corresponds to the closed position
and 10 V to the open position.
End point switches
When actuators are controlled in
sequence, it is possible to use the end
point switches that have set positions.
They will toggle when the valve is fully
open or fully closed, respectively.
Figure 2
PART NUMBERS
FUNCTION
Figure 1
DIMENSIONS
Designation
Explanation
Part number
M700-SRSU
modulating control signal or increase/decrease signal, "Stem Up" spring
action (the stem is pulled up when power off)
880-0430-000
M700-S2-SRSU
modulating control signal or increase/decrease signal, "Stem Up" spring
action (the stem is pulled up when power off) and end point switches
880-0431-000
M700-SRSD
modulating control signal or increase/decrease signal, "Stem Down" spring
action (the stem is pushed down when power off)
880-0440-000
M700-S2-SRSD
modulating control signal or increase/decrease signal, "Stem Down" spring
action (the stem is pushed down when power off) and end point switches
880-0441-000
M700-SRSU+L7SV
modulating control signal or increase/decrease signal, "Stem Up" spring
action (the stem is pulled up when power off), including a linkage for Satchwell
valves
880-0630-000
M700-S2-SRSU+L7SV
modulating control signal or increase/decrease signal, "Stem Up" spring
action (the stem is pulled up when power off) and end point switches,
including a linkage for Satchwell valves
880-0631-000
M700-SRSD+L7SV
modulating control signal or increase/decrease signal, "Stem Down" spring
action (the stem is pushed down when power off), including a linkage for
Satchwell valves
880-0640-000
M700-S2-SRSD+L7SV
modulating control signal or increase/decrease signal, "Stem Down" spring
action (the stem is pushed down when power off) and end point switches,
including a linkage for Satchwell valves
880-0641-000