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MEP-7xxx Direct-Coupled Actuators (up to 320 in-lb.) 

Applications Guide, AN1113A Rev. D

Troubleshooting

Auxiliary Switch Does Not Work

• 

Check the auxiliary switch setting. See the 

CME-7001/7002 Auxiliary Switches Installation 

Guide

.

•  Check the wiring. See 

Wiring Issues on page 10

.

Fail-Safe Does Not Work

•  After initial connection or reconnection to power, 

proper fail-safe operation might be delayed up 

to 20 seconds for the MEP-725x/755x or up to 40 

seconds for the MEP-785x (until the capacitors 

are fully charged).

•  Check the Fail-Safe Direction switch.  See 

Con-

figuration on page 9

.

Feedback Does Not Work

•  Check the feedback 

switch setting. See 

Configu

-

ration on page 9

.

•  Check the wiring. See 

Wiring Issues on page 10

.

No Rotation

•  Check that the direction switch (Switch 2) is fully 

engaged in the proper position. See 

Configura

-

tion on page 9

.

•  Check that the shaft moves freely. (Press and 

hold the gear disengagement lever and manually 

rotate the shaft.)

•  Check for a tripped circuit breaker to the trans-

former (or power supply).

•  Check polarity and strength of input signal.
•  Check for proper supply voltage from the trans-

former (or power supply) and that it has enough 

capacity (VA) for all connected devices. See their 

respective data sheets and 

Tips for Connecting 

24-Volt Power Application Note (AN0604D)

.

•  Check the wiring. See 

Wiring Issues on page 10

.

For direction, feedback, and auto-mapping setup, 

see the 

MEP-7200/7500/7800 Series Installation 

Guide

.

NOTE: 

Before Jan. 2014, 

MEP-7xx2 proportional 

models had (besides the 4-20 mA input) 

0–10 VDC input 

and 

0–5 or 0–10 VDC 

feedback

. From 2014 through July 2015, 

they had a 

2–10

 VDC input and 

1–5 or 2–10

 

VDC feedback instead. Starting in August 

2015, 

all

 these options were available and 

selectable via a jumper and slide switch.

NOTE: 

When the 

0

–10 VDC input is selected (with 

the jumper), selectable (with a switch) 

feedback options are 

0

–5 or 

0

–10 VDC. 

When the 

2

–10 VDC input is selected, 

feedback options are 

1

–5 or 

2

–10 VDC.

Configuration

Summary of Contents for MEP-7 Series

Page 1: ...roduction 2 Torque Requirements for Dampers 2 Models 3 Accessories 4 Auxiliary Switches and End Stops 4 Transformers 4 Enclosure Cord Grip and Wiring Kits 4 Thermostat 4 Mounting Brackets and Crank Arm Kit 5 Master Slave Wiring 6 All Master Slave Combinations 6 MEP 7802 7852 Proportional Actuators 6 MEP 7801 7803 Tri State Actuators 7 MEP 7851 7853 Tri State with Fail Safe Actuators 7 ...

Page 2: ...D Specifications design and operation are subject to change without notice Configuration 8 Troubleshooting 8 Auxiliary Switch Does Not Work 8 Fail Safe Does Not Work 8 Feedback Does Not Work 8 No Rotation 8 Rotation in Wrong Direction 9 Stroke Range Is Wrong 9 Wiring Issues 9 Index 9 ...

Page 3: ...ademark of KMC Controls Inc All rights reserved No part of this publication may be reproduced transmitted tran scribed stored in a retrieval system or translated into any language in any form by any means with out the written permission of KMC Controls Inc The material in this document is for information purposes only The contents and the product it de scribes are subject to change without notice ...

Page 4: ...500 series x 5 7800 series x 8 4 MEP 7x02 4 4 MEP 7x03 4 4 MEP 7x51 4 4 MEP 7x52 4 4 4 MEP 7x53 4 4 4 The MEP 72xx series 120 in lb has been discontinued Use the MEP 75xx series 180 in lb or if less torque is required an MEP 48xx 80 in lb non fail safe or MEP 49xx 90 in lb fail safe instead To replace the MEP 70xx series 150 in lb use MEP 75xx series 180 in lb To replace the MEP 77xx series 300 in...

Page 5: ...tuators from inclement conditions See also the HMO 4521 cord grip For sample proportional heating cooling applica tions using the CTE 5202 electronic thermostat see the CTE 5202 Applica tions Guide An HMO 4521 liquid tight cord grip threads into con duit fittings on MEP 7xxx actuators when an ingress protection rating of IP54 is required The HMO 4521 accepts 0 18 to 0 40 diam eter cables See also ...

Page 6: ... arm kit is used when direct mounting of the actuator is impractical One HMO 4535 non rotation bracket is provided with each actuator It can span an open distance or be formed bent into a shape that increases the dis tance between the mounting surface and the actua tor Mounting Brackets and Crank Arm Kit ...

Page 7: ...unt e g on KMC s flanged globe valves CW CCW Switches Fail Switches MEP 7852 only Unavailable Options Opposite Positions Opposite Positions 4 20 mA input and Auto Mapping MEP 7802 7852 Proportional Actuators MEP 7802 7852 Dual Triple or Quad Actuators 0 10 or 2 10 VDC STACKED Mount e g on KMC s butterfly valves CW CCW Switches Fail Switches MEP 7852 only Unavailable Options Same Positions Same Pos...

Page 8: ...r In CW CCW SLAVE MASTER MASTER SLAVE MEP 7802 7852 Opposite Mount 0 10 VDC Input MEP 7802 7852 Stacked Mount 0 10 VDC Input MEP 7851 7853 Opposite Mount MEP 7801 7803 Opposite Mount MEP 7851 7853 Stacked Mount 24 VAC VDC Power In MEP 7x52 Only 0 10 VDC Control Signal 0 5 or 0 10 VDC Feedback Signal Control Signal Common MEP 7x52 Only MASTER SLAVE 24 VAC VDC Power In CW CCW SLAVE MASTER 24 VAC VDC...

Page 9: ...ld the gear disengagement lever and manually rotate the shaft Check for a tripped circuit breaker to the trans former or power supply Check polarity and strength of input signal Check for proper supply voltage from the trans former or power supply and that it has enough capacity VA for all connected devices See their respective data sheets and Tips for Connecting 24 Volt Power Application Note AN0...

Page 10: ...he wiring at the connected devices Use a voltmeter and ohmmeter to check the terminals for expected values See Tips for Connecting 24 Volt Power Applica tion Note AN0604D NOTE Wiring must be adequate to avoid exces sive voltage drop on long runs Allow plenty of cushion in measurements A meter may be too slow to register tran sient dips or peaks during startup Index Symbols 0 5 0 10 vs 1 5 2 10 VDC...

Page 11: ...Selection Guide Actuator 3 4 Torque 3 Slave Wiring 7 Stacked Mount Master Slave 7 8 Stop Kit End 5 Stroke Range 10 Support Files 3 Switch Auxiliary 9 Fail Safe Direction 7 8 10 Feedback Voltage 9 Rotation Direction 7 8 10 T Thermostat 5 Torque Selection 3 Tri State 8 10 Troubleshooting 9 V Valve Applications 3 VEB 5x Series Ball Valves 3 VEF 5x Series Butterfly Valves 3 W Weather Shield Enclosure ...

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