MEXM

Final Control Elements

VALVE POSITIONER

(for Modbus; built-in SSR)
Functions & Features
• Used for control of valve or damper where capacitor motor and potentiometer are employed 
• Valve opening and position readable via Modbus communication
• Control of 24 - 200 V AC system electric actuator use
• Builtin SSR directly drives an AC motor

MODEL: MEXM-110-AD4[1]

ORDERING INFORMATION

• Code number: MEXM-110-AD4[1]
Specify a code from below for [1].
  (e.g. MEXM-110-AD4/Q)
• Specify the specification for option code /Q
  (e.g. /C01/S01)

FEEDBACK RESISTANCE

1: Potentiometer

CONTROL OUTPUT

1: SSRs incorporated

BRAKE

0: None

POWER INPUT

Universal
AD4: 100 – 240 V AC / 100 – 240 V DC (universal)
(Operational voltage range 85 - 264 V AC, 50 - 60 Hz /
 85 - 264 V DC, ripple 10 %p-p max.)

[1] OPTIONS

blank: none
/Q: With options (specify the specification)

SPECIFICATIONS OF OPTION: Q (multiple selections)

COATING (For the detail, refer to our web site.)
/C01: Silicone coating
/C02: Polyurethane coating
/C03: Rubber coating
TERMINAL SCREW MATERIAL
/S01: Stainless steel

PACKAGE INCLUDES...

• Terminating resistor (110 Ω, 0.25 W)

GENERAL SPECIFICATIONS

Construction: Plug-in
Connection: M3.5 screw terminals
Screw terminal: Chromated steel (standard) or stainless steel
Housing material: Flame-resistant resin (black)
Full-closed position adjustment range: 0 - 25 % (front)
Full-open position adjustment range: 75 - 100 % (front)
Deadband adjustment: 0.1 – 8.0 % (front adj.; refer to the table below) 
  Factory set to 1.5 %
Restarting timer: 2 sec.
Isolation: Modbus to feedback resistance to control output to power
Manual operation switch: Manual full-close or full-open position command

MODBUS COMMUNICATION

Communication: Half-duplex, asynchronous, no procedure
Standard: Conforms to TIA/EIA-485-A
Baud rate: 4800, 9600, 19.2 k, 38.4 k (bps)  (with rotary switch) (factory setting: 38.4 kbps) 
Protocol: Modbus-RTU
Node address setting: 1 - 99 (with rotary switch) (factory setting: 00) 
Parity: None, even or odd  (with DIP switch) (factory setting: odd)
Stop bit: 1 or 2 (with DIP switch) (factory setting: 1)
Segment max. length: 500m
Max. number of nodes: 31 (excluding master)
Modbus LED: Blink in normal communication

INPUT SPECIFICATIONS

■ Feedback Potentiometer: 100 Ω – 10 kΩ
Minimum span: 50 % of total resistance
Excitation: Approx. 3.3 V DC

OUTPUT SPECIFICATIONS

■ Control Output: SSR (zero-crossing); 20 - 240 V AC  0.1 - 1 A
Leakage current at OFF: Approx. 10 mA @ 240 V AC

INSTALLATION

Power consumption
•AC:
  approx. 1.5 VA at 100 V
  approx. 4 VA at 200 V
  approx. 6 VA at 264 V
•DC: Approx. 1 W
Operating temperature: -5 to +60°C (23 to 140°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Atmosphere: No corrosive gas or heavy dust
Mounting: Surface or DIN rail
Weight: 300 g (0.66 lb)

PERFORMANCE

Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 2000 V AC @ 1 minute
(Modbus to feedback resistance to control output to power to ground)

STANDARDS & APPROVALS

Refer to the manuals to comply with the standards.
EU conformity:
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2
Low Voltage Directive 
 EN 61010-1
 Installation Category II (power)
 Measurement Category II (control output)
 Pollution degree 2
  Modbus or control output or feedback resistance to power:
  Reinforced insulation (300 V)
  Modbus or feedback resistance to control output: Reinforced
  insulation (250 V)
RoHS Directive

EXTERNAL VIEW

MODBUS WIRING CONNECTION

EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM

EXPLANATIONS OF TERMS

• SSR (Solid State Relay)
Composed only of semiconductor parts, SSR is free from arc discharge or chattering which is typical with electromagnetic relays. It features excellent characteristics against vibration, physical impact or other environmental conditions.
• Zero-Cross Function
SSR with zero-cross function turns on when AC power voltage is near zero, creating delay of switching when input is provided in the middle of an wave cycle, thus limiting transient switching noise voltage and rush current.

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