Honeywell Modutrol IV M7284 User Manual

1 63-2202—3
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 4
Settings and Adjustments..............................10
Operation and Checkout ..............................11
G. R. • Rev. 8-93 • ©Honeywell Inc. 1993 • Form Number 63-2202—3
The M72XX series Modutrol IV Motors are
used to control dampers and valves. The mo-
tors accept a current or voltage signal from an
electronic controller to position a damper or
valve at any point between open and closed.
■ Replaces M744S,T,Y and M745S,T,Y Motors.
■ M7261, M7274, M7281, M7284, and M7294 are
non-spring return motors; M7272, M7282, M7285,
and M7286 are spring return motors.
■ Oil immersed motor and gear train for reliable per-
formance and long life.
■ Wiring box provides NEMA 3 weather protection.
■ Actuator motor and circuitry operate from 24 Vac.
Models available with factory installed transformer
or an internal transformer can be field added.
■ Quick connect terminals standard—screw termi-
nal adapter available.
■ Adapter bracket for matching shaft height of older
motors is standard with replacement motors.
■ Nominal timing of 30 seconds for 90° stroke and
60 seconds for 160° stroke.
■ Valve and damper linkages, explosion proof hous-
ing, and auxiliary switches available as accessories.
■ Spring return motors are rated for 25 lb.-in. and
60 lb.-in torque.
■ Non-spring return motors are rated for 35 lb.-in.,
75 lb.-in., 150 lb.-in., and 300 lb.-in. torque.
■ Models available with adjustable start (zero) and
span.
■ Models available with 4 to 20 mA input signal.
■ Models available with 2 to 10 Vdc input signal.
■ Die-cast magnesium housing.
M7261, M7272, M7274, M7281,
M7282, M7284, M7285, M7286,
M7294 Modutrol IV Motors

Honeywell Modutrol IV M7284 Specifications

General

Brand	Honeywell
Model	Modutrol IV M7284
Category	Engine
Language	English

Summary

Specifications

Model Details and Ratings

Details model designations, control types, torque, output drive, suffix letters, stroke, timing, load, temperature, shaft, and dimensions.

Important Notes

Highlights manufacturing tolerances and potential performance differences.

Ordering Information

Purchasing Procedure

Instructions for ordering products by specifying the order number.

Contact Information

Provides Honeywell customer support contact details for inquiries and comments.

Installation

Location Guidelines

Guidance on selecting a suitable installation location, considering environmental factors and clearance.

Mounting and Linkages

Mounting Procedures

Instructions on how to mount the motor securely in a horizontal position using flanges and bolts.

Adapter Bracket and Linkage Setup

Details on using the adapter bracket and linkages for damper and valve applications.

Wiring and Auxiliary Switches

Motor Wiring and Connections

Instructions for wiring the motor, including safety precautions and terminal connections.

Auxiliary Switch Operation

Explanation of auxiliary switch actuation by cams and their setting procedure.

Settings and Adjustments

Zero and Span Adjustment

Step-by-step guide to adjust zero and span settings for specific motor models.

Auxiliary Switch Setting Procedure

Procedure for setting auxiliary switch cams, including precautions and differential adjustments.

Operation and Checkout

Motor Operation Principles

Explanation of how the motor feedback potentiometer and control current circuit operate.

Post-Installation Checks

Steps to verify proper operation of the motor, linkage, damper, or valve after installation.