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Operation; Actuator Override - Honeywell 3 Nm Series Installation Instructions Manual

Spring return direct coupled actuators
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1
24 VAC
2
S-BUS
S-BUS
0/2..10 VDC INPUT

OPERATION

The actuator is designed to be used in ventilating and air
conditioning installations to operate valves, dampers,
ventilation flaps and louvers. (For ratings, see the
Specifications section.) If the power fails, the actuator will
spring return to the fail safe position.
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. This
operates in reverse when set to a 10-2(0) position.
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 failure.

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. 22.
3 NM, 5 NM SERIES SPRING RETURN DIRECT COUPLED ACTUATORS
24 VAC
SENSOR
+
Fig. 20. Wiring for 3 position Economizer controllers, MS74 series.
ACTUATOR
1
V
2
3
S-BUS
S3
S2 S1
4
S-BUS
5
0/2..10 VDC OUTPUT
Fig. 21. Wiring for Sylk BUS, MS31 series.
ACTUATOR
1
V
2
3
3 POSITION
4
MINIMUM POSITION
5
FEEDBACK
2-10 VDC
10-2 VDC
3 POSITION
2
MINIMUM POSITION
Fltg, fwd
Fltg, rev
1
EXTERNAL MINIMUM POSITION POT
CAN BE APPLIED TO 4 90°-0°.
2
SET SWITCH TO 3 POSITION.
MS3105J ONLY
1 = ADDRESS 11
1
2 = ADDRESS 12
3 = ADDRESS 13
4 = ADDRESS 14
5 = ADDRESS 15
2
6 = TEST
2. Override to full closed:
a. Disconnect the input signal (from terminal 3).
b. See Fig. 23.
1
24 VAC
0/2 TO 10 VDC
PROPORTIONING
CONTROLLER
+
FEEDBACK
1
LINE VOLTAGE POWER SUPPLY.
PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
24 VDC SUPPLY ACCEPTABLE.
3
SET SWITCH TO MODULATING.
Fig. 22. Override to full open.
9
M32679
LINE VOLTAGE POWER SUPPLY. PROVIDE
DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
24 VDC SUPPLY ACCEPTABLE.
1
2
2
3
0°-90° OR +
4
90°-0° OR N/A
5
FEEDBACK
SPDT
3
M32548
ACTUATOR
V
2-10 VDC
10-2 VDC
0-10 VDC
10-0 VDC
Fltg, fwd
Fltg, rev
M27827
62-0274—07

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