KMC CONTROLS MEP-4200/4500/4900 Series Fail-Safe, Direct-Coupled, Actuators (25/45/90 in-lb.)

Description and Application 

These compact but powerful direct-coupled ControlSet® actuators provide two-position, tri-state, or proportional control for dampers or valves in HVAC systems. Efficient, durable, capacitor-driven fail-safe with switch-selectable direction provides consistent torque in both powered and fail-safe modes. A patented noise reducer provides whisper-quiet operation in both modes. A minimum torque of 25 (MEP-42xx), 45 (MEP-45xx), or 90 (MEP-49xx) in-lb. is available over the 95° angular rotation. 

MEP-4xx2 proportional models accept either a 0–10 or 2–10 VDC control signal input from a thermostat, controller, or building automation system. “Anti-jitter” circuitry significantly reduces hunting and needless wear (from unnecessary miniscule position changes caused by undamped analog input signals) on the actuator, valve, or damper components. A user-initiated, auto-mapping feature provides more precise equipment control by reassigning the input signal range over a reduced rotation range. These models also feature a switch-selectable, 0–5 or 0–10 (or 1–5 or 2–10) VDC voltage feedback output that is proportional to the actuator position.

MEP-4xx1 tri-state/two-position (four-wire) models are designed for use with floating thermostats or controllers. MEP-4xx4/4xx5 two-position (two-wire) models are available in 24 VAC/VDC or 100–240 VAC models. MEP-4x7x models also have one fully adjustable, built-in SPDT auxiliary switch for remote position indication or equipment interface. MEP-497x models include a second fixed switch at 10° from full CW direction. A three-foot cable is included with the switch(es).

All actuators mount directly to 1/4- to 5/8-inch (6 to 16 mm) round shafts or 1/4- to 7/16-inch (6 to 11 mm) square shafts, eliminating the need for expensive and complicated linkages. A non-rotation bracket, to prevent lateral movement, is included with each actuator. A gear disengagement button allows easy manual positioning of the actuator.

Features

• Efficient, durable, capacitor-driven fail-safe option with switch-selectable direction provides consistent torque in both powered and fail-safe modes 
• The fail-safe option, on proportional and tri-state models, can be turned off temporarily for testing purposes or permanently if desired
• Proportional models include “anti-jitter” circuitry, optional auto-mapping of the full input signal range over a reduced actuator stroke, and switchselectable 0/1–5 or 0/2–10 VDC feedback 
• MEP-4x7x models have one fully adjustable, built-in SPDT auxiliary switches, and MEP-497x models include a second fixed switch at 10° from full CW direction 
• Connections are made with prewired 3-foot, 18 AWG cable(s) or fixed terminals that accept 12–26 AWG wiring (see Models on page 2) 
• Direct mounting to standard shaft sizes, gear disengagement button, and adjustable mechanical end stop 
• Patented valve body quick-mount option on MEP-4xxxV models

NOTE: For similar actuators without fail-safe, see the MEP-4000/4800 Series and the MEP4201/4501/4901 data sheets.

NOTE: See also (Quick-Mounting) “V” Models Valve Cross-Reference.

NOTE: The above chart lists the differences among models. Supply power, supply frequency, transformer sizing, fail-safe, angular rotation, noise level, mounting, dimensions, weight, enclosure material, position indication, servicing, quality standard, warranty, and environmental limits are the same for all models.

Specifications: