MEX-P

Final Control Elements

VALVE POSITIONER

(position-preset contact input; built-in SSR)
Functions & Features
• Used for 24 - 200 V AC electric actuator position control
• Controls the electric actuator to a pre-configured target position based on contact input
• Position feedback via potentiometer (100 Ω - 10 kΩ unadjusted)
• Direct motor driving with built-in SSR (with zero-cross circuit)
• Restart control timer built-in to prevent motor overheating due to frequent on/off switching
Typical Applications
• Position damper control using sequencers without analog output
 

MODEL: MEX-P-[1][2]

ORDERING INFORMATION

• Code number: MEX-P-[1][2]
Specify a code from below for each of [1] and [2].
  (e.g. MEX-P-G/B/Q)
• Specify the specification for option code /Q
  (e.g. /C01/S01)

[1] POWER INPUT

AC Power
B: 100 V AC
C: 110 V AC
D: 115 V AC
F: 120 V AC
G: 200 V AC
H: 220 V AC
J: 240 V AC

[2] OPTIONS (multiple selections)

Brake Function
blank: Without
/B : With
Other Options
blank: none
/Q: Option other than the above (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

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)
Preset adjustment range: 0 to 100 % corresponding to Full-closed to Full-open (front)
Deadband: 0.6 - 10.6 % (front)
Timer adjustment: 1 – 30 sec. (front)
Isolation: Contact input to feedback potentiometer to control output to power
Lock protection timer: If the motor doesn't enter the deadband for approx. 2 minutes, then power supply is cut; reset is performed by power OFF or repeating full-open and full-close actions
RUN indicator: Red LED blinks at 0.5 Hz during normal operating
Blinking at 2 Hz when lock protection timer is operating

INPUT SPECIFICATIONS

■ Setting Signals (Contact input)
Contact input capacity: 12 V DC @ 2 mA
Detection level: OFF: ≥ 100 kΩ (≤ 0.1 mA) / ≥ 10 V
ON   ≤ 5 kΩ (≥ 1 mA) / ≤ 1 V
■ Feedback potentiometer
Minimum span: 50% of total resistance
Input range: Can be measured unadjusted from 0 - 100 Ω to 0 - 10 kΩ with potentiometer
Excitation: 1 V DC

OUTPUT SPECIFICATIONS

■ Control Output: SSR (zero-crossing); 20 - 240 V AC 0.1 - 1 A

INSTALLATION

Power input
•AC: Operational voltage range: rating ±10 %,
50/60 ±2 Hz, approx. 3 VA
Operating temperature: -5 to +60°C (23 to 140°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Surface or DIN rail
Weight: 300 g (0.66 lb)

PERFORMANCE

Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength:
1000 V AC @1 minute (Contact input to position feedback to driver output to power)
2000 V AC @1 minute (Contact input to feedback potentiometer to control output to power to ground)

EXTERNAL VIEW

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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