Honeywell ML6275 User Manual
Direct Coupled Rotary Actuator
63-2493-1
APPLICATION
The ML6275 Spring Return Direct Coupled Rotary Actuator is
a floating control motor with an internal, electrically isolated
feedback potentiometer that can be used with controls that
provide switched or floating single pole double throw (spdt)
control output to operate dampers in heating, ventilation, and
air conditioning (HVAC) applications. The feedback potentiometer provides indication of the motor output hub position and
can be used for rebalancing an internal control circuit.
ML6275
Spring Return
PRODUCT DATA
FEATURES
• Mounts directly on horizontal 3/8 in., 1/2 in., and
5/8 in. round and square damper shafts by using
the appropriate insert. Most models are shipped with
1/2 in. insert.
•Provides 25 lb-in. running and spring return torque.
•Magnetic coupling eliminates the need for mechanical
stops or limit switch adjustments by limiting stall
torque to 60 lb-in. maximum.
•95° stroke provides necessary compression of rubber/
neoprene gaskets commonly used on 90° low leakage
dampers.
• 88 second synchronous timing can eliminate need for
feedback position indication in closed-loop
temperature control applications.
• Removable splined output hub permits premounting of
hub on damper shaft, providing installation flexibility.
•Reversible mounting allows actuator to be used for
either clockwise (cw) or counterclockwise (ccw)
spring rotation.
• Designed for both single-point and three-point
mounting, to allow installation flexibility.
•Available with or without a time-out feature. Models
without the time-out feature are designed to be used
with intelligent building management system and/or
controller.
• Standard models have two 8 mm by 12 mm long set
screws for securing the damper shaft. Actuator models
available for various shaft sizes that allow damper shaft
to operate centered inside the output hub.
• Standard one-meter cable with color-coded leadwires
allows external wire connections with 1/2 in. conduit
connectors.
•Two or more actuators can be mounted on one
damper shaft to increase output torque for use on
dampers larger than eight square feet.
Copyright © 1995 Honeywell Inc. • All Rights Reserved
Contents
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 4
Operation ............................................................................ 9
Checkout ............................................................................. 11
ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
SPECIFICATIONS
Models
ML6275: Spring Return Direct Coupled Rotary Actuators
ML6275A: Low Torque (25 lb-in.) Direct Coupled Rotary
Actuator without auxiliary switches or time-out function
ML6275C: Low Torque (25 lb-in.) Direct Coupled Rotary
Actuator with two line voltage rated auxiliary switches
and without time-out function
ML6275D: Low Torque (25 lb-in.) Direct Coupled Rotary
Actuator without auxiliary switches and with time-out
function
ML6275F: Low Torque (25 lb-in.) Direct Coupled Rotary
Actuator with two line voltage auxiliary switches and
with time-out function
Electrical Ratings:
Power Input: 24 Vac ± 20%, 50/60 Hz
Power Consumption:
ML6275A-C: 12 VA maximum at 24 Vac
ML6275D,F: 12 VA maximum at 24 Vac
Auxiliary Switch Ratings: 120, 240 Vac, 3 AFL, 18 ALR, 1A
Pilot Duty
Cable Ratings:
Control: Standard models include nonplenum UL/CSA
rated, 30V, 60°C, 20 gauge computer cable
Auxiliary Switch: UL/CSA rated 300V, 90°C, 18 gauge cable
Controller Type:
Floating, 3-wire drive open, drive closed, hold. Internal
electrically isolated feedback potentiometer provides
indication of motor position
Torque Ratings at Rated Voltages:
Lift and Hold: 25 lb-in. (3 N•m)
Breakaway Minimum: 25 lb-in. (3 N•m)
Stall Minimum: 25 lb-in. (3 N•m) spring return
Stall Driving Maximum: 60 lb-in. (6.5 N•m)
Actuator Stroke:
95° Nominal ± 2°, mechanically limited
Actuator Timing at 90° Stroke:
88 ± 2 seconds synchronous at 60 Hz from 0°F to 140°F;
106 ± 2 seconds at 50 Hz
Spring Wind Timing Upon Power Restoration Only: 100
seconds nominal at 60 Hz, 120 seconds at 50 Hz
Spring Return Timing:
30 seconds maximum per 90° at 72°F rated load
5 minute maximum at -30°F rated load
Ambient Temperature Range:
-30°F to +140°F (-35°C to +60°C)
Storage Temperature:
-30°F to 150°F (-35°C to 65°C)
Humidity:
5 to 95 percent relative humidity, noncondensing
Mounting:
Mounts directly on horizontal 3/8 in. to 5/8 in. (12 to
16 mm) round or square damper shaft. Minimum shaft
length required:
3.5 in. (76 mm) when the shaft attachment is made on
the side of the actuator opposite the duct;
0.65 in. (16 mm) when the hub is mounted on the shaft
before the actuator is installed.
Most actuators are shipped with specifically sized hubs.
Some models contain an assembly with assorted hub inserts.
Mounting bracket is included with most models.
Dimensions:
See Fig. 1
Device Weight:
4.0 lb (1.82 kg)
Noise Rating:
Driving Only: 45 dBA maximum at 0.9m
Spring Rotation:
Clockwise (cw); counterclockwise (ccw) by reverse mounting
Position Indicator:
Mounted on actuator hub
Actuator Design Life:
Full Stroke Cycles: 60,000
Repositions:
1,500,000 minimum
Spring Return Cycles:
7,500
Approvals:
UL94-5V Enclosure: Plenum rating
UL873: Line voltage auxiliary switches
UL Listed: File Number E4436, Guide Number XAPX
CSA Listed: File Number LR95329-17
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE
1. Model number.
2. Application.
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
1. Your local Honeywell Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations
In Canada—Honeywell Limited/Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service
offices in all principal cities of the world.
63-2493—1
®
Catalog or price sheets for complete ordering number, or specify:
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
2
1-17/32 (39)
3-1/16
(79)
3-29/32
(99)
1-21/32
(42)
1-5/8
(41)
1-5/32 (29)
6-25/32 (173)
8-9/32 (210)
ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
23/32
(18)
3-1/2
(89)
1-9/32
(32)
3-15/16 (100)
3-29/32
(99)
3/4 (19)
3/8
(10)
13/64 (5)
1-13/32 (36)
4-13/32 (112)
CLEARANCE
REQUIRED
FOR SPLINED
HUB MOUNTING
135o
o
± 15
1-5/8 (41)
10-13/32 (264)
MOUNTING BRACKET
1-13/32
(36)
1/2 (13)
1-3/32
(28)
5/16
(8)
13/32
(10)
M8257
Fig. 1. Approximate dimensions of ML6275 Spring Return Direct Coupled Actuator and mounting bracket in in. (mm).
Environmental Protection Ratings:
NEMA1 standard with damper shaft in horizontal position
Accessories:
205753 Hub Sleeve, 3/8 in
205758 Hub Sleeve, 5/8 in
Mounting Tab:
For use with Universal mounting bracket
205820A 3-Point Mounting Kit
205830A Crank-Arm Accessory
205840A Tandem Mount Kit
205850A End Stop Kit
3
63-2493—1
ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
INSTALLATION
When Installing this Product…
Read instructions carefully. Failure to follow them could
damage the product or cause a hazardous condition.
Check ratings and description given in the specifications
to make sure the product is suitable for your application.
Installer must be a trained, experienced service
technician.
After installation is complete, check out product operation
as provided in these instructions.
CAUTION
1. Disconnect power before installation to prevent
electrical shock or equipment damage.
2. Never turn motor output hub by hand or wrench.
3. Do not install actuator in areas with acid fumes or
other deteriorating vapors that might attack the
metal parts of the actuator.
4. Do not install actuator in areas with escaping gas
or other explosive vapors that could be ignited by
a spark from the actuator or attached accessories.
Location
Install the actuator in any location free from acid fumes or
other deteriorating vapors that might attack the metal parts of
the actuator. Make sure the location is not subject to
escaping gas or other explosive vapors that could
accidentally be ignited by a spark from the actuator or its
attached parts.
Install the actuator in a location that allows enough clearance
for mounting accessories and for servicing.
Mounting
The ML6275 Direct Coupled Actuator is designed to operate
a damper by driving the damper shaft either cw or
ccw depending on damper design. All actuators are
shipped in the fully closed position.
The ML6275 Direct Coupled Actuator is designed for singlepoint mounting when using an adapter bracket. Single-point
mounting is typically used when the actuator is mounted on
the damper frame.
CAUTION
Do not use the actuator as a shaft bearing. The
actuator must be used only to supply rotational torque.
To prevent damage to the actuator, avoid any side
loads to the actuator output coupling bearings.
Preparation
Before installing the ML6275 on the damper shaft, determine
the opening direction of the damper shaft to determine the
correct spring return rotation and correctly connect the wiring.
The ML6275 can be mounted to provide clockwise or
counterclockwise spring return. Reverse the actuator if
necessary to provide the desired spring action.
Installation
Installing the Actuator and Mounting Bracket
(Single Point Mounting)
When the direction of the damper shaft rotation is determined
(either cw or ccw ), proceed as follows:
Place the ML6275 Direct Coupled Actuator over the
damper shaft.
Position the actuator for best access to the actuator
damper shaft locking screw.
Install the mounting bracket (see Fig. 2) and adjust it to
support the actuator at the correct height. Mark the
screw holes for installing the mounting bracket on the
damper housing.
Remove the mounting bracket and actuator.
Drill or center punch the starting holes for the mounting
bracket screws (or use no. 10 self-tapping sheet metal
screws).
Place the actuator and mounting bracket back into
position over the damper shaft and install the mounting
bracket screws.
Tighten the two 8 mm by 12 mm long set screws firmly
against the damper shaft (maximum tightening torque is
100 lb-in.).
0
9
0
6
0
3
A mounting bracket (see Fig. 1) is provided with some models
to aid in installing the actuator. The bracket can be bent to any
shape to support the actuator at the correct height.
The ML6275 Direct Coupled Actuator can also be three-point
mounted using the two front gear housing slots and the
adapter bracket. Two screws are secured through the two
front gear housing slots and the adapter bracket positioned to
secure the rear of the actuator. Three point mounting is used
for foot mounting the actuator or internally mounting the
actuator in the duct when direct shaft coupling is not possible.
63-2493—1
M9386
Fig. 2. Installing mounting bracket on ML6275 Direct
Coupled Actuator.
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