M-system MEX-D User manual

MEX-D

P. 1 / 3 EM-4616 Rev.7

BEFORE USE ....

Thank you for choosing M-System. Before use, check the

contents of the package you received as outlined below.

If you have any problems or questions with the product,

please contact M-System’s Sales Office or representatives.

■ PACKAGE INCLUDES:

Signal conditioner (body + base socket) ..................... (1)

■ MODEL NO.

Check that model No. described on specification label is

exactly what you ordered.

■ INSTRUCTION MANUAL

This manual describes necessary points of caution when you

use this product, including installation, connection and basic

maintenance procedures.

POINTS OF CAUTION

■ POWER INPUT RATING & OPERATIONAL RANGE

• Check the power rating for the unit on the specification label.

Rating ±10%, 50/60 ±2 Hz, approx. 3VA

■ UNPLUGGING THE UNIT

• Before you remove the unit from its base socket or mount it,

turn off the power supply and input signal for safety.

■ ENVIRONMENT

• Indoor use

• When heavy dust or metal particles are present in the air,

install the unit inside proper housing with sufficient ventila-

tion.

• Do not install the unit where it is subjected to continuous

vibration. Do not subject the unit to physical impact.

• Environmental temperature must be within -5 to +60°C (23

to140°F)withrelativehumiditywithin 30 to 90% RHin order

to ensure adequate life span and operation.

■ WIRING

• Do not install cables (power supply, input and output) close

to noise sources (relay drive cable, high frequency line, etc.).

• Do not bind these cables together with those in which noises

are present. Do not install them in the same duct.

■ MOTOR

• The internal SSR is not designed to direct-reverse driving

for a 200V AC motor.

■ AND ....

• The unit is designed to function as soon as power is

supplied, however, a warm up for 10 minutes is required for

satisfying complete performance described in the data sheet.

INSTRUCTION MANUAL

MODEL MEX-D

VALVE POSITIONER

(current feedback; built-in SSR)

COMPONENT IDENTIFICATION

■ HOW TO OPEN THE FRONT COVER:

Position your finger on the hook at the top of front cover and

pull.

■FRONT PANEL CONFIGURATIONS

The shape of base socket may be different

for some models.

Body Base Socket

Connection

Diagram Label

Front Cover

Specification

Label

Span Adj.

Zero Adj.

Deadband Adj.

Timer Adj.

MEX-D

P. 2 / 3 EM-4616 Rev.7

INSTALLATION

Detach the yellow clamps located at the top and bottom of the

unit for separating the body from the base socket.

■ DIN RAIL MOUNTING

Set the base socket so that its

DIN rail adaptor is at the bot-

tom. Position the upper hook

at the rear side of base socket

on the DIN rail and push in the

lower. When removing the

socket, push down the DIN rail

adaptor utilizing a minus

screwdriver and pull.

■ WALL MOUNTING

Refer to the drawings below.

■ DIMENSIONS mm (inch)

■ CONNECTION DIAGRAM

Clamp

(top & bottom)

DIN Rail

35mm wide

Spring Loaded

DIN Rail Adaptor

Shape and size of the base socket

are slightly different with various

socket types.

TERMINAL CONNECTIONS

Connect the unit as in the diagram below or refer to the connection diagram label on top of the unit.

5678

1110

80 (3.15)

50 (1.97) 107 (4.21)

136 (5.35) [3.3 (.13)]

80 (3.15)

(.79)

35.4 (1.39)

40 (1.57)

50 (1.97)

7.8 (.31)

CLAMP

(top & bottom)

DIN RAIL

35mm wide

2–4.5 (.18) dia.

MTG HOLE

25 (.98) deep

11–M3.5

SCREW

•When mounting, no extra space is needed between units.

AC MOTOR

POWER

min.

max.

FEEDBACK

–

SETPOINT

RE-TRANSMITTED OUTPUT

MEX-D

P. 3 / 3 EM-4616 Rev.7

CHECKING

1) Terminal wiring: Check that all cables are correctly

connected according to the connection diagram.

2) Power input voltage: Check voltage across the terminal 7

–␣ 8 with a multimeter.

3) Input: Check voltage across the terminals 5 (+) – 6 (–) to

show within 0.4 to 2V.

4) Feedback signal: Check voltage across the terminals 10 –

11 to show within 80 to 400mV.

5) Output: Check voltage across the output terminals.

Output Operation

ON: ≤2V AC across the output terminals

OFF: 60 – 280V AC across the output terminals

When deviation between the setpoint and the position is

narrower than deadband, the output terminals show the

status equal to ‘SET = POS.’

ADJUSTMENTS

■ CONNECTING TO THE MOTOR

The motor must be connected carefully considering the rela-

tion between the motor’s rotating direction and the feedback

signal. If the connection is inappropriate, the MEX, upon

startup, drives the motor until it hits either end of span with

no control capability in midspan.

■ DEADBAND

The deadband is factory set to the maximum value (20%).

Turn the adjustment counterclockwise until hunting stops.

Adjustable within 2 to 20%.

■ MOTOR POSITIONING

0% Position

Apply 0% setpoint signal and adjust the 0% output position

with Zero Adjustment. Adjustable within 0 to 25%.

100% Position

Apply 100% setpoint signal and adjust the 100% output

position with Span Adjustment. Adjustable within 75 to

100%.

POWER ON OFF

OUT. TERM.

SET < POS SET = POS SET > POS –

1 – 3 OFF OFF ON OFF

2 – 3 ON OFF OFF OFF

■ TIMER

Set minimum interval for open/close operation, used for

protecting control motor from too frequent open/close opera-

tion. Adjustable to 1 – 30 seconds.

Deadband adjustment can realize similar effects. Combine

these two functions according to the control loop characteris-

tics to minimize the motor’s operation and prevent it from

overheating and wearing unnecessarily.

MAINTENANCE

Regular calibration procedure is explained below:

■ CALIBRATION

Confirm the motor position at 0%, 50% and 100% input

signals.

LIGHTNING SURGE PROTECTION

In order to product the unit from lightning surges entering

through power supply cables, use of appropriate Lightning

Surge Protectors are recommended. Please contact M-Sys-

tem.

M-SYSTEM WARRANTY

M-System warrants such new M-System product which it manufactures to be free from defects in materials and workmanship during the 36-month period following the date that such

productwasoriginallypurchasedifsuchproducthasbeenusedundernormaloperatingconditionsandproperlymaintained,M-System'ssoleliability,andpurchaser'sexclusiveremedies,

under this warranty are, at M-System's option, the repair, replacement or refund of the purchase price of any M-System product which is defective under the terms of this warranty. To

submit a claim under this warranty, the purchaser must return, at its expense, the defective M-System product to the below address together with a copy of its original sales invoice.