MODEL: L4AS

L4AS SPECIFICATIONS

ES-1991 Rev.5 Page 1/4

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

Plug-in Signal Conditioners M-UNIT

QUAD DC ALARM

Functions & Features

• Providing relay contact closures at preset DC input levels

• 4 setpoints: Hi/Hi, Hi, Lo, Lo/Lo

• Single turn screwdriver or dial setpoint adjustments

• Enclosed relays

• Relays can be powered 110 V DC

• Isolation up to 2000 V AC

• High-density mounting

Typical Applications

• Annunciator

• Various alarm applications

75

(2.95)

112

(4.41)

75

(2.95)

mm (inch)

50

100

%

0

2

1

3

4

50

100

%

0

50

100

%

0

50

100

%

0

MODEL: L4AS–[1][2][3]–[4]

ORDERING INFORMATION

• Code number: L4AS-[1][2][3]-[4]

Specify a code from below for each of [1] through [4].

(e.g. L4AS-1A1-R)

[1] SETPOINT ADJUSTMENTS

1: Single-turn screws

2: Dials

[2] INPUT

Current

A: 4 – 20 mA DC (Input resistance 250 Ω)

Voltage

6: 1 – 5 V DC (Input resistance 1 MΩ min.)

[3] OUTPUT

1: 4 points; coil energized with input > setpoint

2: 2 points; coil energized with input < setpoint 2 points;

coil energized with input > setpoint

[4] POWER INPUT

AC Power

K: 85 – 132 V AC

(Operational voltage range 85 – 132 V, 47 – 66 Hz)

L: 170 – 264 V AC

(Operational voltage range 170 – 264 V, 47 – 66 Hz)

DC Power

R: 24 V DC

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

P: 110 V DC

(Operational voltage range 85 – 150 V, ripple 10 %p-p max.)

GENERAL SPECIFICATIONS

Construction: Stand-alone; terminal access at the front

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

Housing material: Flame-resistant resin (black)

Isolation: Input to output to power

Setpoint adjustments: Single-turn screwdriver adjustments

or dials (front); -15 – +115 % independently

Hysteresis (deadband): Approx. 1 %

Front LEDs: Red LED turns on when the coil is energized.

INPUT SPECIFICATIONS

■ DC Current: Input resistor incorporated

OUTPUT SPECIFICATIONS

■ Relay Contact: 100 V AC @ 1 A (cos ø = 1)

120 V AC @ 1 A (cos ø = 1)

240 V AC @ 0.5 A (cos ø = 1)

30 V DC @ 1 A (resistive load)

Maximum switching voltage: 380 V AC or 125 V DC

Maximum switching power: 120 VA or 30 W

Minimum load: 5 V DC @ 10 mA

For maximum relay life with inductive loads, external

protection is recommended.