MS-1233
Series
MS-1233 Series
Damper, Proportional, Non-Spring Return Actuators
These actuators provide electronic proportional
control of small dampers not requiring the return to
normal position upon power interruption. Typically
used with terminal units in VAV systems in
conjunction with the PP-8121 controller. Also used
with TP-8101 room controller for mixing boxes in
constant volume double duct systems.
Features:
• Variable Vdc or variable mAdc.
• Direct coupling to damper shaft. Requires no damper
linkage.
• Optional two SPDT auxiliary switch models.
Model Chart
Model No.
MS-1233
MS-1233-002
MS-1233-100
MS-1233-102
Control Input
2 to 15 Vdc at
2 mA
4 to 20 mAdc
Start Point
6 Vdc (factory set), adjustable
2 to 12 Vdc
4 mAdc (fixed)
Span
3 Vdc (fixed) for full
actuator stroke
16 mAdc (fixed) for
full actuator stroke
Power Supply
Available
SPDT Aux.a
Switches (Adj.)
+20 Vdc,
50 mA
None
+20 Vdc,
50 mA
None
2
2
a 5 amps @ 24 Vdc (AC 50/60 Hz), Pilot Duty 100 VA. Switches have gold contacts suitable for dry circuit switching.
Specifications
Control type
Reversible proportional shaft rotation can stop at any point in the stroke.
Power requirements
Volts
24 AC (+10%, -15%).
Hz
50/60.
Full load amps
0.21.
Torque
20 lb-in. (2.3 N-m). The damper must withstand 35 lb-in. (4.0 N-m) of torque if travel is less than the
fixed actuator stroke set by the internal torque switches.
Nominal Damper Area
Actuator sizing should be done in accordance with damper manufacturer’s specifications.
Output shaft
Rotation
Fixed at 90° (+5, -0°). Factory set CCW end as viewed from cover side of actuator. Torque switches
limit travel in CW and CCW directions reducing the need for travel adjustment and preventing
over-stress on dampers.
Construction
Hollow.
No load timing
Three minutes, 45 seconds nominal.
Auxiliary switch
Adjustable SPDT. Refer to Model Chart.
FCC
Complies with Class B testing according to the rules and regulations of part 15 radio frequency
devices (including television), sub part J, computing devices.
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MS-1233 Series
Specifications (Continued)
Environment
Ambient temperature limits
Shipping and storage: -40 to 140°F (-40 to 60°C).
Operating: 40 to 140°F (4 to 60°C).
Humidity
5 through 95% RH, non-condensing.
Locations
NEMA Type 1.
Vibration
Maximum 1G in any plane.
Atmosphere
Avoid locations with corrosive fumes, vapors, abrasive dust, explosive conditions, high radio
frequency, or electromagnetic generating devices.
Connections
Coded screw terminals that will accept up to 16 gage wire.
Case
Galvanized steel.
Mounting
Any position over a 1/2 in. (12.7 mm) diameter damper shaft [minimum length 1-1/8 in. (29 mm)].
Dimensions
5-1/8 H x 5-1/4 W x 3-1/4 D in. (130 x 133 x 83 mm).
Accessories
Model No.
AM-111
AM-112
AM-113
AM-115
AM-122
AM-125
AM-132
AM-165
Description
Crank arm for 5/16 in. diameter damper shaft.
Crank arm for 3/8 in. diameter damper shaft.
Crank arm for 1/2 in. diameter damper shaft.
Crank arm for 7/16 in. diameter damper shaft.
Linkage connector, straight type.
5/16 in. x 20 in. damper rod.
Linkage connector, ball type.
Mounting kit, includes crank arm, 1/2 in. diameter shaft and bearing mounting bracket.
Typical Applications
24 Vac
Power
Blue
Control
1 Signal
2-15 Vdc
24H
8
COM
9
MS-1233
1 9 Vdc actuator rotates clockwise.
6 Vdc actuator rotates
counterclockwise as viewed from
cover side of actuator.
2 10K W Impedance
Yellow 2 OP1 12 IV1 Impedance
10K W
Red
+20 Vdc 10
Figure 1 Actuator Heating/Cooling with 2 to 15 Vdc Input.
224
MS-1233 Series
Terminals
24 Vac
Power
Control
Signal
2-15 Vdc
H
8 24H
Blue (COM)
Yellow (OP1)
9 COM
12 IV1 Impedance 10KW
Red (+20)
10 +20 Vdc
11 IV2 Override Imp. 2.5KW
1
C1
2
N.C.1
N.O.1
Max. Vac 24 or Vdc
Power
3
G
H
MS-1233-002
††
4
24 Vac Max
5
N.C.2
C2
N.O.2
6
G
†
Control Signal
9 Vdc actuator rotates clockwise. *
6 Vdc actuator rotates counterclockwise. *
* As viewed from cover side of actuator.
† Two-position heating or cooling device. Switch #2 may be readjusted from 10˚
from the CW end to the CW or CCW end or at any point between.
†† Indicating device, relay, bell, light or input to a microprocssor-based
controoler in any energy management system.
For a continuous voltage signal position indication, use terminals 9(-) and
12(+) which typically provide a 6Vdc (CCW end) to 9 Vdc (CW end) sinal.
Figure 2 Two Aux. Switches for Actuator Position Indication and
Heating/Cooling Schemes with 2 to 15 Vdc Input.
1 250Ω Impedance
2 Signal between terminals 9 and
12: The 20 mA actuator rotates
clockwise. The 4 mA actuator
rotates counterclockwise as
viewed from cover side of actuator.
24 Vac
Power
4-20mA
Control
Signal
2
(–)
(+)
1
24H
8
COM
9
2
MS-1233-10X
12
Figure 3 Actuator with 4 to 20 mA Input.
24 Vac
Power
Two-Position
Thermostat
TC-1101
Temp.
Drop
1 10K W Impedance
24H
8
COM
9
MS-1233
1 IV1 12
+20 Vdc 10
Figure 4 Typical Two-Position Control.
225