background image

PRODUCT DATA

® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc.   •   All Rights Reserved

ML7295 Spring Return

Direct Coupled Actuators

APPLICATION

The ML7295 Spring Return Direct Coupled Actuator (DCA) is
a control motor that provides proportional control for dampers
or valves in heating, ventilation, and air conditioning (HVAC)
applications. The actuator accepts either a current or voltage
signal from any electronic controller to position the damper/
valve at any chosen point between fully open and fully closed.
For hydronic valve applications, a complete line of brackets
and linkages are available for mounting Honeywell DCAs on
globe valves and on Honeywell ball valves. The ML7295
provides an electronic feedback signal (0-10 Vdc). This
feedback signal provides indication of the motor output hub
position and can be used for rebalancing an external control
circuit.

FEATURES

Brushless DC motor achieves sophisticated control of
speed, torque and braking.

Provides 142 lb-in. (16 N•m) torque.

Mounts directly on 3/8 in. to 1 in. (9 to 25 mm) round
and 1/4 in. to 3/4 in. (6 to 18 mm) square shafts.

Self-centering shaft coupling minimizes installation
time.

Spring return direction is field-selectable to simplify
installation.

Manual override permits unpowered positioning to
simplify installation and troubleshooting. Deactivation
of interlock is manual or automatic when power is
restored.

Highly-visible position indicator facilitates setup,
checkout and troubleshooting.

Rugged, lightweight all-metal alloy housing provides
durability.

Integral conduit connection.

Integral adjustable range-stop.

Models available with 0-10 Vdc input signal.

Models available with 4-20 mA input signal.

Models available with adjustable zero and span.

Models available with two fully adjustable line voltage
auxiliary switches.

Contents

Applications ......................................................................

1

Features ...........................................................................

1

Specifications ...................................................................

2

Ordering Information ........................................................

2

Installation ........................................................................

3

Operation .........................................................................

6

Checkout ..........................................................................

7

129-237

Rev. 1, 10/97

63-2539-1

Summary of Contents for ML7295 Series

Page 1: ... FEATURES Brushless DC motor achieves sophisticated control of speed torque and braking Provides 142 lb in 16 N m torque Mounts directly on 3 8 in to 1 in 9 to 25 mm round and 1 4 in to 3 4 in 6 to 18 mm square shafts Self centering shaft coupling minimizes installation time Spring return direction is field selectable to simplify installation Manual override permits unpowered positioning to simpli...

Page 2: ...onsumption Running 9 VA Holding 5 VA Feedback Signal Voltage output 0 10 Vdc Maximum current output 0 5 mA Cable Ratings Control Standard models include non plenum UL CSA rated 30V 140 F 60 C 18 gauge cable Auxiliary Switch UL CSA rated 300V 194 F 90 C 18 gauge cable Controller Type 0 to 10 Vdc or 4 to 20 mA All models have a feedback signal Torque Rating at rated voltage Lift and Hold 142 lb in 1...

Page 3: ...ation as provided in these instructions WARNING Installing the actuator near explosive vapors could result in serious injury or death A spark from the actuator or attached accessories could ignite escaping gas or explosive vapors Install actuator in areas free of escaping gas and other explosive vapors CAUTION Failure to disconnect power before installation can result in electrical shock or equipm...

Page 4: ...on and wiring connections The ML7295 can be mounted to provide clockwise or counterclockwise spring return Determine appropriate mounting orientation See Fig 2 for mounting orientation Measure shaft length If the shaft is less than three inches in length the shaft coupling must be located between the damper valve and actuator housing If the shaft length is more than three inches the shaft coupling...

Page 5: ...7 If necessary replace the holder and position indicator on the shaft coupling Installation Installing Actuator and Mounting Bracket Single Point Damper Mounting NOTE For valve mounting see the literature accompanying the mounting equipment or bracket With the direction of the damper shaft rotation determined either cw or ccw proceed as follows 1 Place the ML7295 DCA over the damper shaft 2 Positi...

Page 6: ...ignal that will drive the motor closed It is factory set to 0 Vdc and can be adjusted as high as 5 Vdc U Span is factory calibrated and adjusts the motor response to travel full stroke through the selected input span It is factory set to 10 Vdc and is adjustable from 2 to 30 Vdc L1 HOT L2 1 1 24 VAC METER 8 GREY 9 PINK 1 RED S1 GREEN RED S2 GREEN BLUE S3 GREEN PINK S4 BLACK RED S5 BLACK BLUE S6 BL...

Page 7: ...ch a signal will be given by the switch see Fig 9 Once power is restored the actuator will return to normal automated control 20 30 30 10 20 40 40 50 60 70 70 80 90 A B AUX SWITCH ADD 0 5 10 20 30 60 70 80 90 0 10 20 30 60 70 80 90 M11699 Fig 9 Actuator rotary range and auxiliiary switch signal locations CHECKOUT To perform a checkout of the ML7295 DCA proceed as follows 1 Check the damper or valv...

Page 8: ... Limited Honeywell Limitée 155 Gordon Baker Road North York Ontario M2H 3N7 Honeywell Latin American Division Miami Lakes Headquarters 14505 Commerce Way Suite 500 Miami Lakes FL 33016 Helping You Control Your World 63 2539 1 B B Rev 10 97 Home and Building Control Honeywell Inc Honeywell Plaza P O Box 524 Minneapolis MN 55408 0524 Printed in U S A on recycled paper containing at least 10 post con...

Reviews: