KMC Controls MEP-4900 User Manual

Mounting

2.812
(71.4)

1.563
(39.7)

Fail-Safe, Direct-Coupled Actuators (25/45/90 in-lb.)

MEP-4200/4500/4900 Series

Installation Guide

Adjustable
Stop

1.625
(41.3)

6.000

(152.4)

Remove Conduit Cover to
Access Selector Switches

Fail Direction

Switch

3-Foot Cables

(Some Models)

Adjust. Auxiliary

Switch Dial

° Rotation

Indicators

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.

HMO-4002 Non-Rotation

Bracket included with

MEP-425x/455x Models

HMO-4001 Non-Rotation “T”

Bracket included with

MEP-4x7x/49xx Models

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-lb.
on MEP-42xx models or 60–70 in-lb. on MEP­45xx/49xx models).

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.

MEP-4200/4500/4900 Series 1 Installation Guide

Wiring

Selector

Switches

(Under Conduit Fitting)

Power/Signal

Terminal Block

3. Thread wires through the plugged opening and
connect to the terminal block according to the

relevant model and application.

4. For MEP-4xx2 models, adjust the feedback

voltage, direction, and automapping as needed.

See Direction, Feedback, and Auto-Mapping

(MEP-4xx2) on page 4. For MEP-4x51

models, adjust the selector switch as shown in
Illustrations 2 and 4–6.

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

Aux. Switch

Cable

Power/Signal

Cable

Illustration 2—Cables and Terminal Block Options

CAUTION ATTENTION

Risk of electrical shock.
Disconnect ALL power
before servicing. More than
one disconnect provided
on models with auxiliary
switches. Failure to follow
electrical safety precautions
with live electrical
components could result in
injury or death.

If both conduit connections
are used, they MUST be
externally connected during
installation. The nonmetallic
enclosure does not provide
grounding connection
between the two conduit
connections.

Depending on the model, signal/power wiring might
be to terminals under the conduit ing or to color-
coded wires in the aached cable. See Illustration 2.
Consult the model label and the appropriate wiring
shown in Illustrations 3 through 8.

For auxiliary switch wiring and seing, see Auxil-

iary Switch (MEP-4x7x) on page 3.

For models withOUT the aached signal/power
cable:

Risque de choc électrique.
Débranchez l’alimentation
avant l’entretien. Plus d’un
sectionneur fourni sur les
modèles avec contacts
auxiliaires. L’inobservation
des consignes de sécurité
électrique avec des
composants électriques sous
tension peut entraîner des
blessures ou la mort.

Si les deux entrées de câble
sont utilisés, ils doivent être
connectés en externe lors de
l’installation. Le boîtier non­métallique n’assure pas la
connexion à la terre entre les
deux connexions.

NOTE: After initial power-up, proportional models

have a 30-second delay of motor operation.

COM (Black)

T

OUT (Green)

2–10 IN (White)

~24 V (Red)

Feedback Output
1–5 or 2–10 VDC

+
–

Illustration 3—MEP-4xx2 Proportional Control

1 2

Switch

Position

CW

CCW

–

T

COM

Illustration 4—MEP-4x51 Tri-State Floating Point Control

Switch Position

T

CW

1 2

Contact Position:

Open = CW Rotation

Closed = CCW Rotation

CCW

Illustration 5—MEP-4x51 2-Position Control (4-Wire), CCW Leg

~/+

–

–
+

~24 V

~/+

–

COM

~24 V

Power Supply

24 VAC/VDC

Control Signal

2–10 VDC

Power Supply

24 VAC/VDC

Power Supply

~/+

–

24 VAC/VDC

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.

MEP-4200/4500/4900 Series 2 Installation Guide

Switch Position

COM

T

CW

CCW

1 2

Contact Position:
Open = CCW Rotation
Closed = CW Rotation

~24 V

Power Supply

~/+

–

24 VAC/VDC

Illustration 6—MEP-4x51 2-Position Control (4-Wire), CW Leg