MSXX10, MSXX20 SERIES
15
63-2607—26
OPERATION
The actuator is designed to be used in ventilating and air
conditioning installations to operate valves, dampers,
ventilation flaps and louvers requiring torque up to the
rating. (For ratings, see the Specifications section.) If the
power fails, the actuator will spring return to the start
position.
The actuator is operated by a proportional controller. When
using a proportional controller, the actuator drives toward
its fully open position when the input signal increases; the
actuator drives toward the fully closed position when the
input signal decreases. The actuator stops when the input
signal reaches the desired proportional control point.
IMPORTANT
The actuator is designed to respond to DDC
Controller instantaneous contact closures. Take
care not to short cycle the actuator. Unstable
damper control can cause premature actuator fail-
ure.
Actuator Override
To override the control signal (for freeze protection or
similar applications):
1.
Override to full open:
a. Disconnect the input signal (from terminal 3).
b. Apply 24 Vac to terminal 3.
c. See Fig. 32.
2.
Override to full closed:
a. Disconnect the input signal (from terminal 3).
b. See Fig. 33.
Fig. 32. Override to full open.
Fig. 33. Override to full close.
End Switches
Some models include end switches (see Table 2). For wiring
details, see Fig. 12.
SPDT Switches (Fig. 34)
For SPDT end switch wiring, see Fig. 12.
Fig. 34. SPDT End Switch Operation.
ACTUATOR
0/2 TO 10 VDC
PROPORTIONING
CONTROLLER
24 VAC
1
1
2
3
2
LINE VOLTAGE POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
24 VDC SUPPLY ACCEPTABLE.
SET SWITCH TO MODULATING.
V
OR +
OR N/A
FEEDBACK
–
+
FEEDBACK
5
4
3
1
2
M19576A
2-10 VDC
10-2 VDC
0-10 VDC
10-0 VDC
Fltg, fwd
Fltg, rev
3
SPDT
ACTUATOR
0/2 TO 10 VDC
PROPORTIONING
CONTROLLER
24 VAC
1
1
2
3
2
LINE VOLTAGE POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
24 VDC SUPPLY ACCEPTABLE.
SET SWITCH TO MODULATING.
V
OR +
OR N/A
FEEDBACK
–
+
FEEDBACK
5
4
3
1
2
M19577A
2-10 VDC
10-2 VDC
0-10 VDC
10-0 VDC
Fltg, fwd
Fltg, rev
3
SPST
M19578
95
SWITCH CONNECTIONS
ACTUATOR POSITION
85
7
3
0
S4
S1
S6
S5
S3
S2
CONTACT OPEN
CONTACT MADE
+
-
3
+
-
