MODEL: 18AC

18AC SPECIFICATIONS

ES-1836 Rev.8 Page 1/3

http://www.m-system.co.jp/

Rack-mounted DCS Signal Conditioners 18-RACK

AC CONVERTER

Functions & Features

• Converting an alternating current/voltage into two

standard process signals

• True RMS sensing

• Second channel output available at the front terminals

and at the Standard Rack connector

Typical Applications

• Converting a large AC current in combination with a shunt

resistor, or a narrow span AC voltage

MODEL: 18AC–[1]66–R

ORDERING INFORMATION

• Code number: 18AC-[1]66-R

Specify a code from below for [1].

(e.g. 18AC-A666-R)

[1] INPUT

Current

AA: 0 – 10 mA AC (Input resistance 100 Ω)

AB: 0 – 50 mA AC (Input resistance 20 Ω)

AC: 0 – 100 mA AC (Input resistance 10 Ω)

AD: 0 – 500 mA AC (Input resistance 1 Ω)

AZ: Specify current (See INPUT SPECIFICATIONS)

(0 % input must be 0 mA.)

Voltage

A1: 0 – 100 mV AC (Input resistance 10 kΩ min.)

A2: 0 – 500 mV AC (Input resistance 10 kΩ min.)

A3: 0 – 1 V AC (Input resistance 10 kΩ min.)

A4: 0 – 5 V AC (Input resistance 200 kΩ min.)

A5: 0 – 10 V AC (Input resistance 200 kΩ min.)

A6: 0 – 120 V AC (Input resistance 200 kΩ min.)

A7: 0 – 150 V AC (Input resistance 200 kΩ min.)

A8: Specify voltage (See INPUT SPECIFICATIONS)

(0 % input must be 0 V.)

OUTPUT 1

Voltage

6: 1 – 5 V DC (Load resistance 2000 Ω min.)

OUTPUT 2

Voltage

6: 1 – 5 V DC (Load resistance 2000 Ω min.)

POWER INPUT

DC Power

R: 24 V DC

(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)

GENERAL SPECIFICATIONS

Construction: Rack-mounted; terminal access via screw

terminals on the front and connector on the rear; terminal

cover provided

Connection

Input: M3.5 screw terminals (torque 0.8 N·m)

Output 1: Connector

Output 2: M3.5 screw terminals (torque 0.8 N·m)

and connector

Power input: Supplied from connector

Screw terminal: Nickel-plated steel

Isolation: Input to output 1 to output 2 to power

Input waveform: Up to 15 % of 3rd harmonic content

Overrange output: 0 to 120 % at 1 – 5 V

Zero adjustment: -5 to +5 % (front)

Span adjustment: 95 to 105 % (front)

INPUT SPECIFICATIONS

Frequency: 40 Hz min., 1 kHz max.

■ AC Current: 0 – 1 A AC; input resistor incorporated

Minimum span: 1 mA

Input resistance

Span 1 mA: 1 kΩ

Span ≤ 2 mA: 500 Ω

Span ≤ 5 mA: 200 Ω

Span ≤ 10 mA: 100 Ω

Span ≤ 20 mA: 50 Ω

Span ≤ 50 mA: 20 Ω

Span ≤ 100 mA: 10 Ω

Span ≤ 500 mA: 1 Ω

Span ≤ 1 A: 0.5 Ω

■ AC Voltage: 0 – 250 V AC

Minimum span: 50 mV

Input Resistance

Span 50 mV – 3 V : ≥ 10 kΩ

Span ≥ 3V : ≥ 200 kΩ