Installation Instructions schneider-electric.

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MS40-7043, MS41-7073/7153 Series

SmartX Spring Return Proportional Actuators

Application
SmartX Actuators (Direct Coupled) are designed to be used
in both damper and valve control applications. The following
general instructions are for damper applications. Refer to the
Applicable Literature table for valve literature.
The MS4X-7XX3 series spring return actuators provide pro-
portional modulation control of dampers and valves in HVAC
systems. MS40-7043
MS40-7043-501
MS40-7043-MP
Features MS40-7043-MP5
• Proportional models controlled by 6…9 Vdc, 2…10 Vdc, or
4…20 mA with the addition of a 500 ohm resistor
• 133 lb-in (15 N-m), 60 lb-in (7 N-m) or 35 lb-in (4 N‑m) of
torque
• Rugged die-case housings rated for NEMA 2 / IP54
• Optional built-in auxiliary switch to provide for interfacing
or signaling
• Provides 95° of rotation
• Visual position indicator provided
• Provides true mechanical clockwise or counterclockwise
spring return operation for reliable fail safe application and
positive close-off in air tight damper applications
• MS40-7043-MPX models controlled by 6…9 Vdc
MS41-7073
with auxiliary 20 Vdc power supply provides power MS41-7153
to controllers, replacing MP-5XXX/MPR-5XXX MS41-7073-502
electrohydraulic actuators MS41-7153-502
• Direct mount to round or square damper shafts
• Switch provided for selection of direct or reverse acting
control mode
• Rotation limiting available
• MS41-7153 SmartX Actuators can be double-mounted
(gang mounting) to accommodate high torque application
requirements
• Five year warranty
• MS41-7073 and MS41-7153 SmartX Actuators are
equipped with manual override

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Applicable Literature
F-Number Description Audience Purpose
– Sales Personnel
Describes the globe valve actuator/linkage
MA4X-XXXX-2XX, MF4X-XXXX-2XX, MS4X-XXXX-2XX – Application Engineers
assembly’s features, specifications, and
F-26750 Series Actuator/Linkage Assemblies General – Installers
possible applications. Provides step-by-
Instructions – Service Personnel
step mounting instructions.
– Start-up Technicians
– Sales Personnel
Describes the actuator/linkage/ball valve
– Application Engineers
VX-2000 Series Ball Valve Assembly Installations assembly’s features, specifications, and
F-26751 – Installers
Instructions possible applications. Provides step-by-
– Service Personnel
step mounting instructions.
– Start-up Technicians
– Sales Personnel
Provides actuator specifications and part
– Application Engineers
MX4X-7XXX, MX40-6XXX SmartX Actuator Selection number cross referencing of phased out
F-26646 – Installers
Guide actuators with the new direct-coupled
– Service Personnel
actuators.
– Start-up Technicians
– Sales Personnel
VX-2000, VX-7000, MX4X-7XXX, MX40-6XXX Provides part number cross referencing of
– Application Engineers
Linked Globe Valve Assemblies phased out globe and ball valve
F-26752 – Installers
Actuator/Linkage Assemblies assemblies with the new direct-coupled
– Service Personnel
with SmartX Actuators actuators.
– Start-up Technicians
– Application Engineers
– Installers Describes Schneider Electric approved
F-26080 EN-205 Water System Guidelines
– Service Personnel water treatment practices.
– Start-up Technicians
F-13755 CA-28 Control Valve Sizing Provides charts, equations, and diagrams
– Application Engineers
F-11080 Valve Selection Chart Water to assist in the configuration of valve
– Installers
system applications. TOOL-150, valve
– Service Personnel
F-11366 Valve Selection Chart Steam (two-way valves only) sizing slide rule may be purchased
– Start-up Technicians
separately.

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SPECIFICATIONS
Actuator Inputs
Control Signal: See Table‑1.
Power Input: See Table‑1. All 24 Vac circuits are Class 2.
Connections: 3 ft. (91 cm) plenum rated cable for MS40-7043-XXX and 3 ft. (91 cm) appliance cables for MS41-7153-XXX and
MS4X-7073-XXX, 1/2” (13 mm) conduit connectors. For M20 Metric conduit, use AM-756 adaptor.

Actuator Outputs
Electrical:
Position Feedback Voltage “AO”:
MS40-7043, MS41-7153 and MS41-7073 2…10 Vdc (max. 0.5 mA) output signal for position feedback or to operate up to four
additional slave actuators.
Auxiliary Switches:
MS40-7043-MP5 and MS40-7043-501 One SPDT 6A (1.5A) @ 24 Vac, adjustable 15…95° (MIN to 1 scale).
MS41-7153-502 and MS41-7073-502 Two SPDT 7A (2.5A) @ 250 Vac, one fixed @ 5° and one adjustable 25…85°.
Auxiliary Power Supply:
MS40-7043-MP and MS40-7043-MP5 +20 Vdc @ 25 mA (max).
Mechanical:
Stroke: Angle of rotation 95° ±5°. Adjustable 30°…95° with AM-689 installed on MS41‑7153-XXX or MS41-7073-XXX. MS40-
7043-XXX models are adjustable 40°…95° by adjusting the stop block position on the actuator.
Damper Shaft Clamp:
MS40-7043-XXX The factory installed universal clamp is used for shafts up to 5/8” (15 mm) diameter or up to 1/2” (13 mm)
square. AM-710 accessory clamp is required when mounting actuators to shafts up to 3/4” (19 mm) diameter or up to 1/2” (13
mm) square.
MS41-7153-XXX or MS41-7073-XXX The factory installed universal clamp is used for shafts up to 3/4” (19 mm) diameter or
up to 1/2” (13 mm) square. AM-687 accessory clamp is required when mounting actuators to shafts up to 1.05” (27 mm)
diameter or up to 5/8” (15 mm) square.
Position Indicator: Visual indicator.
MS41-7153 and MS41-7073 -5…90° (-5° is spring return position).
MS40-7043 0 to 1 (0 is spring return position).
Nominal Damper Area: Actuator sizing should be done in accordance with damper manufacturer’s specifications.
Direction of Rotation: Clockwise or counterclockwise rotation determined by actuator mounting.
Manual Override: MS41-7073 and MS41-7153 are equipped with a manual rotation adjustment from -5°…85°.
Right/Left Switch Permits reverse acting/direct acting rotation.

Environment
Ambient Temperature Limits:
Shipping & Storage -40…160°F (-40…71°C).
Operating -22…140°F (-30…60°C).
Humidity: 15…95% RH, non-condensing.
Location:
MS41-7153-XXX and MS41-7073-XXX NEMA 1 (IEC IP30). NEMA 2 (IEC IP54) with conduit connector in the down position.
MS40-7043-XXX NEMA 2 (IEC IP54) no restrictions.

Agency Listings
UL 873: Underwriters Laboratories (File #E9429 Category Temperature-Indicating and Regulating Equipment).
CUL: UL Listed for use in Canada by Underwriters Laboratories. Canadian Standards C22.2 No. 24-93.
European Community: EMC Directive (89/336/EEC). Low Voltage Directive (72/23/EEC)
Australia: This product meets requirements to bear the RCM Mark according to the terms specified by the Communications
Authority under the Radiocommunications Act 1992.

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Table-1 Specifications.

Approximate
SmartX Actuator Power Input Timing in Seconds Output Torque
@ 70°F (21°C)a Rating
lb.-in. (N-m) Auxiliary
Hold- Auxiliary
Part Number Running Power Input
ing Switch
Supply
Spring
Voltage 50/60 Powered
50 Hz 60 Hz DC Return Max.
Hz Min.b
Amps Stall
VA W VA W W
MS40-7043 No
35 150
5.6 4.2 5.6 4.2 0.15 2.4 <130 <25
MS40-7043-501 Onee (4) (17)
2…10c
MS41-7073 24 Vac No Vdc or
± 20% 60 250
5.8 4.6 5.8 4.6 0.17 2.3 <195 <30 None 4…20d
MS41-7073-502 22-30 Twof (7) (28)
mA w/
Vdc
500 W
MS41-7153 No
133 350
9.8 7.4 9.7 7.4 0.28 2.9 <190 <30
MS41-7153-502 Twof (15) (40)

24 Vac
MS40-7043-MP No
± 20% +20 Vdc
35 150 6…9c
22-30 6.6 5.0 6.6 5.0 0.17 3.2 <130 <25 25 mA
(4) (17) Vdc
MS40-7043-MP5 Vdc One Max.

a Timing was measured with no load applied to the actuator.

b De-rating is required at low temperatures.
c 2-10 Vdc or 6-9 Vdc input impedance 80 k ohms.
d 4-20 mA with 500 ohm input impedance 500 ohms.
e One adjustable from 0° to 95° rotation (0 to 1 scale).
f One adjustable from 25° to 85° rotation and one set to operate @ 5° fixed.

ACCESSORIES
AM-671 Universal Mounting Bracket, AM-693 is required
AM-672 Universal Mounting Bracket, AM-693 is required
AM-673 Multiple Actuator Mounting Bracket (MA40-7153 series)
AM-674 Weather Shield
AM-675 Base Mounting Plate for AM-674
AM-676 Universal Shaft Extension, AM-710 required
AM-703 Input Rescaling Module, adjusts signals to 2…10 Vdc, zero and span adjustment
AM-704 Interface, pulse width modulation
AM-705 Positioner (NEMA 4 housing)
AM-706 Min and/or Manual Positioner for flush panel mount
AM-708 500W resistor for 0…20 mA control signal
AM-714 Weather Shield (polycarbonate)
AM-756 Metric Conduit Adapter M20 x 1.5…1/2” NPT
AM-761 7-inch replacement anti-rotation bracket
AM-762 9-inch replacement anti-rotation bracket
MS41-7153-XXX and MS41-7073-XXX
AM-686 Damper Position Indicator
AM-687 Universal Clamp for up to 1.05” (27 mm) diameter shafts
AM-688 Replacement Universal Clamp
AM-689 Rotation Limiter
AM-690 Crank Arm for round shafts up to 3/4” (19 mm)
AM-691 Crank Arm for jackshafts up to 1.05” (27 mm)
AM-692 V-bolt Kit for AM-690 and AM-691 Crank Arms
AM-693 Damper Linkage Kit
AM-758 Short “U” mounting bracket for replacing Honeywell Mod III type actuators and new
installations, AM-690 or AM-691 is required
AM-759 Tall “U” mounting bracket for replacing Honeywell Mod IV type actuators and new
installations, AM-690 or AM-691 is required
AM-760 Slotted “L” mounting bracket, AM-690 or AM-691 is required
AM-763 Crank for manual override

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MS40-7043-XXX
AM-709 Damper Position Indicator
AM-710 Universal Clamp for up to 3/4” diameter shafts
AM-711 Crankarm for up to 1/2” round shaft
AM-712 Crankarm Adaptor Kit
AM-713 Mounting Bracket for Honeywell Mod IV, M6415 type actuators, and new installations
AM-715 Crankarm Adaptor Kit for Honeywell Mod IV M6415 type actuators, and new
installations
AM-717 Replacement Universal Clamp

Table-2 Auxiliary Power Supply.

Model # Rating
MS40-7043-MP or MS40-7043-MP5 + 20 Vdc, 25 mA Maximum
Control Wires Blue (+) Grey (-)

TYPICAL APPLICATIONS
(wiring diagrams) Figure‑1 and Figure‑2 illustrate typical wiring diagrams for spring return proportional
actuators. See Table‑1 for model selection and control signal specifications.

Caution: This product contains a half-wave rectifier power supply and must not be powered
off transformers used to power other devices utilizing non-isolated full-wave rectifier power
supplies. Refer to EN-206, Guidelines for Powering Multiple Devices from a Common
Transformer, F-26363 for detailed information.

Note: DC operation is applicable to models manufactured after date code 0212.

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Figure-1 Proportional Control of System 8000 Room Temperature Controller

Application of MS40-7043-XXX SmartX Actuator.

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MS41-7073-XXX and MS41-7153-XXX

Caution: This product contains a half-wave rectifier power supply. It must not be powered
with transformers that are used to power other devices utilizing non‑isolated full‑wave
rectifier power supplies. Refer to EN‑206, Guidelines for Powering Multiple Devices from a
Common Transformer, F‑26363 for detailed information.

MS41-707X-502 and MS41-715X-502 units manufactured prior to the date code 0141
(October 6, 2001) used different color coding for the auxiliary switches.

Auxiliary Switch 1
Orange: Fixed auxiliary switch common (com)
Yellow: Fixed auxiliary switch normally closed (NC)
Violet: Fixed auxiliary switch normally open (NO)

Auxiliary Switch 2
Orange/white: Adjustable auxiliary switch common (com)
Violet/white: Adjustable auxiliary switch normally closed (NC)
Yellow/white: Adjustable auxiliary switch normally open (NO)
The label information on these units is incorrect. If replacing these units, the auxiliary
switch operation of the replacement actuator will be per the product label and Figure‑2.

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Figure-2 Typical Wiring Diagrams for Proportional Control 24 Vac Basic and Double Auxiliary Switch Models.

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INSTALLATION
INSTALLATION

Inspection Inspect the package for damage. If damaged, notify the appropriate carrier immediately. If
undamaged, open the package and inspect the device for obvious damage. Return
damaged products.

Requirements • Job wiring diagrams

• Tools (not provided):
– #8 sheet metal screws (Universal Bracket)
– 10mm open end wrench or socket wrench (Universal V-clamp)
– 1/8 inch, allen wrench (Aux. Switch)
– Appropriate screwdriver(s)
– Drill and appropriate bits
• Appropriate accessories
• Training: Installer must be a qualified, experienced technician
Precautions General

Warning:
• Electrical shock hazard! Disconnect the power supply (line power) before installation to
prevent electric shock and equipment damage.
• Make all connections in accordance with the job wiring diagram and in accordance with
national and local electrical codes. Use copper conductors only.

Caution:
• Avoid electrical noise interference. Do not install near large contactors, electrical
machinery, or welding equipment.
• MS41-707X and MS41-715X Manual override to be used only when power is not
applied to unit.
• When operating manual override, back off 5° from full open mechanical stop to ensure
proper release.
• MS41-707X and MS41-715X Do not attempt to use the manual override with actuators
mounted in tandem. Damage to the gear train may occur.
• Do not drill holes in actuator body. Six pre-drilled holes are located on each side, under
the label, to accept #10-24 thread forming screws for mounting accessories.

Federal Communications Commission (FCC)

Note: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in residential installations. This
equipment generates, uses, and can radiate radio frequency energy and may cause harmful
interference if not installed and used in accordance with the instructions. Even when
instructions are followed, there is no guarantee that interference will not occur in a particular
setting—Which can be determined by turning the equipment off and on—the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver
is connected.
• Consult the dealer or an experienced radio/television technician for help.

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Canadian Department of Communications (DOC)

Note: This Class B digital apparatus meets all requirements of the Canadian Interference-
Causing Equipment Regulations.
Cet appareil numerique de la classe B respecte toutes les exigences du Reglement sur le
material broilleur du Canada.

European Standard EN 55022

Warning: This is a Class B digital (European Classification) product. In a domestic
environment this product may cause radio interference in which case the user may be
required to take adequate measures.

Location
Caution: Avoid locations where excessive moisture, corrosive fumes, vibration, or
explosive vapors are present.

Mounting
Caution: To remain in NEMA 2/IP54 compliance, the MS41-715X and MS41-707X series
actuators should be mounted with conduit end down.

Mount the SmartX Actuator directly on the damper shaft in locations that clear the
maximum dimensions of the actuator case and allow the actuator to be mounted flush to
the surface of the terminal box and perpendicular to the damper shaft.
MS41-707X and MS41-715X If the universal clamp is not set to 0° on the position indicator,
manually wind the actuator in the direction indicated with hex wrench from -5°…0° and lock
with a screwdriver.

Note: Some terminal boxes have sheet metal screw heads or other protrusions near the
damper shaft. In these cases, a spacer or shim may be added under the anti-rotation
bracket of the actuator to make the actuator perpendicular to the shaft.

Damper Actuator Sizing

Correct sizing of the actuator is necessary for proper control of dampers. The area of
damper that can be controlled by a given actuator is dependent upon the type of damper,
the quality of the damper, the pressure drop across the damper in the closed position, and
the velocity of the air flow through the damper. To obtain actual damper torque
requirements, contact the damper manufacturer.

Damper Shaft Sizing

Use the “Long Damper Shaft” mounting instructions if the damper shaft is at least 3-1/2”
(90 mm) long.
Use the “Short Damper Shaft” mounting instructions if the damper shaft is shorter than
3‑1/2” (90 mm) or the area around the damper shaft is too narrow to allow standard
mounting, as described in the “Short Damper Shaft” mounting section.

Changing Direction of Rotation

The MS40-7043, MS41-7074, and MS41-7153 actuators are equipped with a switch to
control the direction of rotation. The switch can be set to “L” (left) or “R” (right) rotation. An
actuator set to “L” will have a clockwise rotation when viewed from the left side. When
viewed from the right side the rotation will be counterclockwise. Refer to Figure‑3.

Caution: These are spring return actuators. It is possible to switch to a direction that moves
the actuator against the -5° positive stop. Example: Viewing the actuator from the left side
with the switch set to “R” and an increasing signal. The actuator will attempt to rotate beyond
the -5° stop and will stall.

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Counter-Clockwise rotation Counter-Clockwise rotation

on increasing signal on increasing signal

Clockwise rotation Clockwise rotation

on increasing signal on increasing signal

L R R L

Counter-Clockwise rotation Counter-Clockwise rotation

on increasing signal on increasing signal

Clockwise rotation
Clockwise rotation
on increasing signal on increasing signal

L R R L

Figure-3 Rotation Switch Settings.

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MS40-704X SmartX Actuator Installation

Note: The MS40-704X SmartX Actuator comes equipped with standard universal
mounting clamp. For damper shafts larger than 5/8” (16 mm) in diameter, the AM-710
universal mounting clamp is required (order separately). The AM-710 clamp
accommodates shafts sizes up to 3/4” (19 mm) diameter shafts.

Long Shaft Short Shaft

Min. 3/4" (20 mm)

Min. 3 1/2" (90 mm)

3/8" to 3/4" Diameter (10 mm to 20 mm)

3/8" to 1/2" Square (10 mm to 13 mm)

Move the damper to its normal position. Verify the controller action is set to match the
damper application.

Normally closed damper: when damper is closed, actuator position indicator should
be at 0°. When damper is open, actuator position indicator should be at 90°.

Normally opened damper: when damper is open, actuator position indicator should
be at 0°. When damper is closed, actuator position indicator should be at 90°.

A - Left Shaft Rotates A - Right Shaft Rotates

Clockwise Counterclockwise
To Open To Open

This step determines

shaft rotation. Linkage
may change damper direction.

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B - Left - Long Shaft 2

B - Right - Long Shaft
2 2
R
3 L 2
1 1

1
3 L
4
4
"L" Marker

"R" Marker

1. Assemble mounting clamp.

2. Assemble retaining clip.
3. Place actuator over shaft.
4. Hand tighten clamp nuts. Universal
Universal 1 mounting clamp.
1 mounting clamp.
Correct clamp mounting 2 Retaining clip.
.4 .4
2 Retaining clip. position if actuator is
.2 in normal spring .2

0 return position 0
L (before preload) R

B - Left - Short Shaft B - Right - Short Shaft

B B

"L" Marker 2 2
R A L A
4
3
4 3
L

R
1
1
3
3
1 "R" Marker
1
2
2

2
2

1 Universal clamp. 1 Universal clamp.

2 Retaining clip. A. Assemble damper position indicator. 2 Retaining clip.

B. Assemble retaining clip. 3 Damper position indicator.
3 Damper position indicator.
1. Position mounting clamp.
2. Assemble retaining clip.
3. Slide actuator over shaft.
4. Hand tighten clamp nuts.

.4
Correct pointer mounting .4
position if actuator is
.2 .2
in normal spring
0 return position 0

L (before preload) R

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C - Left and Right

Center the
Universal Bracket in the Slot
1
.8
.6
.4
.2
0

1/2

1/2

1
5

7 x1

8
6 x2

#8 Sheet Metal
1 Screw

5. Center bracket in slot.

6. Drill two holes.
7. Start one screw.
8. Swing bracket down.

D- Left CL Centerline
D- Right CL Centerline

1 1
1 1.8
10 0° .8 .8 .8
.6
.6
.6
.6
.4
0° 10
.4 .4
.2 .4 .2
L 0 .2 0.2
0 0 R

9 9
12 12 12

14
14
5°
5° 11
11
13
13
9. Loosen clamp nuts.
10. Check that the shaft is in full zero position.
11. Swing actuator 5° in the direction of travel. Do not move shaft.
12. Tighten clamp nuts to 4 to 6 lb-ft (5.4 to 8.2 N-m) of torque.
13. Move bottom of actuator back into position.
14. Pivot bracket back into position.

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E- Left E - Right
1 1
.8
.8
.6 .6
.4 .4
.2 .2
L 0
0 R

12

15 x2 15 x2

15. Tighten bracket screws.

.4
Correct clamp mounting .4
position
.2 .2
(after 5˚ preload)
0 0
L R

MS4X-707X and MS4X-715X Series Installation

Caution: Do not drill additional holes in the actuator body. Six pre‑drilled holes are located
on each side, under the label, to accept #10‑24 thread‑forming screws for mounting
accessories.

Note: The MS4X‑707X and MS4X‑715X series actuators come equipped with standard
universal mounting clamp installed. For damper shafts larger than 3/4” (19 mm) in diameter,
the AM‑687 universal mounting clamp is required (order separately). The AM‑687 clamp
accommodates round shaft sizes up to 1.05” (27 mm) in diameter or 5/8” (16 mm) square
shafts.

Caution: The MS41-707X and MS41-715X actuators are equipped with a manual override.
• The manual override to be used only when power is not applied to the unit.
• If the universal clamp is not set to 0° on the position indicator, manually wind the
actuator in the direction indicated with hex wrench from -5°…0° and lock with a
screwdriver.
• When operating manual override, back off 5° from full open mechanical stop to ensure
proper release.
• Do not attempt to use the manual override with actuators mounted in tandem. Damage
to the gear train could occur.
• Using power tools to adjust the manual override will cause damage to the gears.
• To unlock manual override without power, crank the manual override in the direction
indicated a minimum of 5°.

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L
R

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Jackshaft Installation
(MS40-7043 Series)
The MS40-7043 actuator is designed for use with jackshafts up to 3/4” (19 mm) in diameter.
In most applications, the MS40-7043 actuator may be mounted in the same manner as a
standard damper shaft application. If the jackshaft diameter is larger than 5/8” (16 mm) in
diameter, the optional AM-710 universal clamp must be used.

(MS41-7153 and MS41-7073 Series)

The MS41-7153 and MS41-7073 actuators are designed for use with jackshafts up to 1.05”
(27 mm) in diameter. In most applications, the actuator may be mounted in the same
manner as a standard damper shaft application. If the jackshaft diameter is larger than
3/4” (19 mm) in diameter, the optional AM-687 universal clamp must be used.

Multiple Actuator Mounting (MS41-7153 only)

If more torque is required than one actuator can provide, a second actuator may be
mounted to the jackshaft or standard damper shaft, using the AM-673 multiple mounting
bracket. See Figure‑4.

Caution: MS41-707X, 715X - Do not attempt to use the manual override with actuators
mounted in tandem. Damage to the gear train may occur.

Multiple actuators may be powered from one transformer provided the following rules are
followed:
• The total current draw of the actuators (VA rating) is less than, or equal to, the rating of
the transformer.
• Polarity on the secondary of the transformer is strictly followed.
– All Black wires from all actuators are connected to the common lead on the
­transformer.
– All Red wires from all actuators are connected to the hot lead.

Caution: Mixing the Black and Red wires on one lead of the transformer may result in
erratic operation or failure of the actuator and/or controls.

Multiple actuators positioned by the same control signal may be powered from multiple
transformers provided the following rules are followed:
• The transformers are properly sized.
• All Black wires from all actuators are tied together and tied to the negative lead of the
control signal.

Figure-4 Mounting Multiple Actuators.

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Installation Instructions schneider-electric.com | 20

Wiring Requirements Control Leads

See Table‑3 for power wiring data. Refer to Figure‑1 and Figure‑2 for typical wiring.

Table-3 Power Wiring.

Actuator Maximum Wire Run in ft. (m)

Part Number
Voltage 12 AWG 14 AWG 16 AWG 18 AWG 20 AWG 22 AWG
MS40-7043 (-MP)
1100 700 430 270 170 110
MS40-7043-501 (335) (213) (131) (82) (52) (34)
(MP5)
24 Vac MS41-7073 1000 640 400 250 160 100
22-30 Vdc
MS41-7073-502 (305) (195) (122) (76) (49) (30)
MS41-7153 600 380 240 150 90 60
MS41-7153-502 (183) (116) (73) (46) (27) (18)

Auxiliary Switch MS40-7043-501(-MP5) SmartX Actuators include one built-in SPDT auxiliary switch which
can be used for interfacing or signaling (e.g., for fan start-up). The switch is adjustable
between 15° and 95° of rotation (MIN to 1 scale).
The MS41-7153-502 and MS41-7073-502 SmartX Actuators include two built-in SPDT
auxiliary switches which can be used for interfacing or signaling (e.g., for fan start-up). The
switch position near the normal (spring return) position is fixed at 5°. The other is adjustable
between 25° and 85° of rotation.

Adjusting the Switching Point

Refer to Table‑4 for auxiliary switch rating.

Adjusting the switching point for MS40-7043-501 (-MP5)

1. The actuator must be in its normal (spring return) position.
2. Use a flat screw driver to rotate the switch pointer until it is at the desired switch position
on the MIN to 1 scale.

Adjusting the switching point for MS41-7153-502 or MS41-7073-502

1. The actuator must be in its normal (spring return) position.
2. Insert a 1/8” allen wrench into the hex hole located in the center of the adjustable switch
pointer.
3. Rotate the wrench until the switch pointer is at the desired switch position in degrees,
from 25…85°.

Table-4 Auxiliary Switch Rating.

Part Number Voltage Resistive Load Inductive Load

MS40-7043-501 (MP5) 24 Vac 6A 1.5A
MS41-7073-502
250 Vac 7A 2.5A
MS41-7153-502

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21 | schneider-electric.com Installation Instructions

Rotation Limitation Rotation Limitation for MS40-7043 Series SmartX Actuators

The Stop Block is used in conjunction with the tab on the universal clamp or the AM-709
position indicator. In order to function properly, the clamp or indicator must be mounted
correctly.
The Stop Block controls the rotational output of the MS40-7043 and MS41‑7043-501
actuators. It is used in applications where a damper has a designed rotation that is less
than 90°, for example with a 45° or 60° rotating damper. It can also be used to provide a
minimum damper position which is easily set, or changed, without removing the actuator
from the damper.
1. Determine the amount of damper rotation required. The actuator stop block provides
limited rotation from 40°…95°.
2. Loosen the screw securing the stop block to the actuator.

Note: The actuator is shipped with the Stop Block mounted to the “L” side. If the damper
application requires the “R” side face the installer, simply remove the Stop Block and screw
and move it to the new location.

3. Slide the stop block into position, so that its edge lines up with the degree graduation on
the actuator face which corresponds with the required rotation. See Figure‑5.
4. Secure the stop block in place.
5. Test the damper rotation by applying power and the required control signal. Re-adjust if
necessary.

1 1

.8 .8

.6 .6

.4 .4

L .2 .2 R
0 0
1

.8

.6

.4

R
.2

Figure-5 Adjusting Stop Block for Limited Rotation.

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Installation Instructions schneider-electric.com | 22

Rotation Limitation for MS41-7153 and MS41-7073 SmartX Actuators

The AM-689 rotation limiter is used in conjunction with the tab on the universal clamp or
the AM-686 position indicator which comes with the AM-689. In order to function properly,
the clamp or indicator must be mounted correctly.
The AM-689 rotation limiter controls the rotational output of the MS41-7153, MS41‑7153-
502, MS41-7073, and MS41‑7073-502 actuators. It is used in applications where a
damper has a designed rotation that is less than 90°, for example with a 45° or 60° rotating
damper. It can also be used to provide a minimum damper position which is easily set, or
changed, without removing the actuator from the damper.
1. Determine the amount of damper rotation required.
2. Locate the AM-689 rotation limiter on the actuator so that its edge lines up with the
degree graduation on the actuator face which corresponds with the required rotation.
See Figure‑6.
3. Find the appropriate cross-hair location through the slot of the rotation limiter. This is the
mounting location for the retaining screw.
4. Pierce through the label material to allow easy fastening of the retaining screw.
5. Position the rotation limiter back to the desired position, making sure the locating “teeth”
on the rotation limiter are engaged into the locating holes on the actuator.
6. Fasten the rotation limiter to the actuator using the self-tapping screw provided.
7. Test the damper rotation by applying power and the required control signal. Re-adjust if
necessary.

Screw secured at Angle of rotation

these cross hairs. is now set at 40.

90 90
80 80
70 70
60 60
50 50
40 40
30 30
90
80
70
60
50
40
30

Figure-6 Securing the AM-689 Rotation Limiter.

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23 | schneider-electric.com Installation Instructions

Minimum Damper Positioning

Note: When using the AM-689 rotation limiter with an MS41-7073 or MS41-7153 actuator to
provide a minimum damper position, the short shaft mounting procedure must be used to
mount the actuator.

Caution:
• The AM-689 rotation limiter should not be used with an MS41-7073 or MS41-7153
actuator to provide a minimum damper position in outdoor air damper applications. The
rotation limiter prevents the damper from reaching the full-closed position. This may
cause coils to freeze or may cause other system problems to occur.

1. Position the damper to its minimum position by providing the appropriate control signal to
the MS41-7073 or MS41-7153.
2. Place the position indicator onto the actuator spline in the approximate position shown in
Figure‑7. Fasten it with the retaining clip.
3. Place the AM-689 rotation limiter on the actuator so that it either makes contact with, or is
as close as possible to, the edge of the indicator. See Figure‑8.
4. Make sure that the locating teeth are engaged into the locating holes on the actuator. If
all of the mounting teeth do not align with the holes, the mounting location of the
indicator to the spline may have to be moved. The rotation limiter would then be
remounted to get the best position match of both parts.
5. Find the cross-hair location through the slot of the rotation limiter. This is the mounting
location for the retaining screw.
6. Pierce through the label material to allow easy fastening of the retaining screw.
7. Fasten the rotation limiter to the actuator using the self tapping screw provided.
8. Test the damper operation by applying power and the required control signal. Re-adjust if
necessary.
90

90
70 0
80 0

60
7

50 60
50
40 40
30 30
20 20
10 10
0 0
-5
-5

L R

Figure-7 Installing the Position Indicator.

90

90
70 0
80 0

60
7

50 60
50
40 40
30 30
20 20
10 10
0 0
-5
-5

L R

Figure-8 Positioning the Rotation Limiter.

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Installation Instructions schneider-electric.com | 24

CHECKOUT After the entire system has been installed and the actuator has been powered up, the
following check can be made for proper system operation. Check for correct operation of
the damper while actuator is being stroked.
1. Apply power to the actuator. Actuator and damper should be driven to their powered
position as determined by the control signal.
2. On the MS4X-7XXX-50X models, check for correct auxiliary switch operation.
3. Break power to the actuator. Actuator and damper should return to the spring return
position.

Note: Check that the transformer(s) are sized properly.

• If a common transformer is used with multiple actuators, make sure that polarity is
observed on the secondary. This means connecting all Black wires to one leg of the
transformer and all Red wires to the other leg of the transformer.
• If multiple transformers are used with one control signal, make sure all Black wires are
tied together and tied to control signal negative (-).
• Controllers and actuators must have separate 24 Vac power sources.

Go, No Go Test 1. Turn 24 Vac power to actuator off.

2. Disconnect and temporarily insulate the yellow/black input wire.
3. With “L” side of the actuator facing the installer, set the L/R switch to “R.”
4. Turn actuator power back on.
5. Switch the L/R switch to the “L” position.

6. The actuator should drive to the full counterclockwise position.

THEORY OF The actuators are mounted directly onto a damper shaft using a universal V-clamp. When
OPERATION the actuator is powered and a Vdc or mAdc control signal is applied to the actuator by the
controller, the actuator rotates to a position determined by the control signal. At the same
time the spring return mechanism is tensed. When power is removed from the actuator, the
spring returns the actuator to its normal position. The actuators provide true mechanical
spring return operation for reliable, positive close-off on air tight dampers.
The MS40-704X-501 models are provided with one built-in auxiliary switch. The SPDT
switch is provided for interfacing or signaling, for example, fan startup. The switching
function is adjustable between 15° and 95° rotation (MIN to 1 scale).
All MX4X-7XX3-XXX series actuators use a brushless DC motor which is controlled by a
microprocessor. The microprocessor supplies intelligence to provide a constant rotation
rate and to know the actuator’s exact normal position. The microprocessor monitors and
controls the brushless DC motor’s rotation and provides a digital sensing function to
prevent damage to the actuator in a stall condition. The actuator may be stalled anywhere
in its normal rotation without the need for mechanical end switches.
The MS41-707X-502 and MS41-715X-502 models are provided with two built-in auxiliary
switches. The SPDT switches are provided for interfacing or signaling, for example, fan
startup. The switching function is adjustable on one switch between 25° and 95° rotation,
and the other switch is fixed to operation at 5° rotation.
All MS41-7XX3 and MS41-7XX3-5XX actuators provide a 2 to 10 Vdc feedback signal
corresponding to the actuator position as determined by the control signal. MS40-7043-MP
and MS40-7043-MP5 models provide a 20 Vdc, 25 mA power supply used to power TAC
System 8000 controllers in lieu of position feedback.

The MS41-707X-XXX and MS41-715X-XXX actuators are equipped with a manual override
mechanism. This allows the actuator to be manually positioned at any point between -5°
and 85° rotation. This mechanism is accessible on both sides of the actuator and can be
used to ensure tight close-offs for valves and dampers. The manual override should not be
used while a unit is powered or on units that are mounted in tandem.

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25 | schneider-electric.com Installation Instructions

MAINTENANCE Regular maintenance of the total system is recommended to assure sustained

optimum performance. The MS4X series actuators are maintenance free.

None. Replace with a functional actuator.

FIELD REPAIR

DIMENSIONAL DATA

Figure-9 MS40-7043 Spring Return Damper Actuator Dimensions.

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Document Number: F-26645-10
Installation Instructions schneider-electric.com | 26

Figure-10 MS41-7073 and MS41-7153 Spring Return Damper Actuator Dimensions.

© 2020 Schneider Electric. All rights reserved. All trademarks are owned by Schneider Electric Industries SAS or its affiliated companies. July, 2020 tc
Document Number: F-26645-10