KMC Controls MEP-4501, MEP-4901 Installation Manual

Mounting

2.812
(71.4)

1.563
(39.7)

Tri-State/Two-Position Actuators (25/45/90 in-lb.)

MEP-4201/4501/4901

Installation Guide

Adjustable
Stop

° Rotation
Indicators

1.625
(41.3)

6.000

(152.4)

HMO-4001 Non-Rotation “T”
Bracket included with MEP-4901

HMO-4002 Non-Rotation
Bracket included with
MEP-4201& MEP-4501

Gear
Disengagement
Lever

Removeable Conduit Fitting with
(2)1/2" NPS Threaded Holes (for
use with flexible conduit only)

Illustration 1—Overview (Direct-Coupled Mounting)

1. Ensure the damper can move freely through its

entire range of motion, and x any binding before
installing the actuator. Turn the damper blade to

its fully closed position.

2. Press (to the right) and hold the gear disengage­ment lever (see Illustration 1), rotate the actuator
to the fully closed position, and release the lever.

NOTE: Depending on the damper-seal design,

backing the actuator o its stop
approximately 5° may provide tight
damper shut-o.

3. Align the actuator and slide it onto the shaft.

4. Leaving a gap between the actuator and
mounting surface to prevent any binding, nger­tighten the nuts on the V-bolt.

3.406
(86.5)

5. Insert the provided (HMO-4001/4002, dependent
on model) non-rotation bracket into the slot at the
base of the actuator and secure the non-rotation
bracket with two #8 or #10 self-tapping screws.

6. Evenly tighten the V-bolt nuts (30–35 in-lbs.
on MEP-4201 model or 60–70 in-lbs. on MEP­4501/4901).

7. If desired, use a 7/64-inch hex key wrench to
loosen and position the end-stop screw.

NOTE: The two holes at the top of the actuator

are NOT for use in direct-coupled
applications. (They are for remote

mounting, such as with the optional
HLO-4001 Crank Arm Kit.) For mounting

to valves, see the appropriate valve
installation guide.

Gear
Disengagement
Lever

HMO-4002
Non-Rotation

Bracket
Mounting

Surface

MEP-4201/4501/4901 1 Installation Guide

Wiring

Switch Position

Selector

Switches

(Under Conduit Fitting)

Power/Signal

Terminal Block

Illustration 2—Wiring Compartment

To wire the actuator:

1. Loosen the screw on the conduit ing and lift up
to remove the ing.

2. Using a utility knife or drill, cut the red plug
to accept wiring or replace the plug with an
application-specic ing.

NOTE: The red plug (or similar ing) protects

internal components from debris, helping

to ensure long actuator life.

1 2

CW

CCW

–

T

COM

–

Power Supply

24 V AC/VDC

~/+

Illustration 5—Tri-State Floating Point Control

Maintenance

No routine maintenance is required. Careful
installation will ensure long term reliability and

performance.

More Information

For models, specications,

and additional information,
see the MEP-4201/4501/4901

Data Sheet on the KMC

web site.

3. Thread wires through the plugged opening and
connect to the terminal block according to the
relevant application. Adjust the selector switch.
See Illustrations 3 through 5.

4. Reinstall the conduit ing and tighten the screw.

Switch Position

COM

T

CW

CW

CCW

T

CCW

COM

–

Power Supply

24 V AC/VDC

~/+

–

Power Supply

24 V AC/VDC

~/+

1 2

Contact Position:

Open = CW Rotation

Closed = CCW Rotation

Illustration 3—Two-Position Control, CCW Leg

Switch Position

1 2

Contact Position:
Open = CCW Rotation
Closed = CW Rotation

Illustration 4—Two-Position Control, CW Leg

For accessories, trouble­shooting, torque selection,
links to sample applica­tions, and other informa­tion, see the MEP-4xxx

Applications Guide on the

KMC web site.

KMC Controls, Inc.

19476 Industrial Drive

New Paris, IN 46553

574.831.5250

www.kmccontrols.com

[e-mail]

MEP-4201/4501/4901 2 Installation Guide

© 2013 KMC Controls, Inc. 039-019-02B