MODEL: JB2

JB2 SPECIFICATIONS

ES-2642 Rev.5 Page 2/5

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

RELATED PRODUCTS

• Programming Unit (model: PU-2x)

• PC configurator software (model: JXCON)

Downloadable at M-System’s web site.

A dedicated cable is required to connect the module to the

PC. Please refer to the internet software download site or

the users manual for the PC configurator for applicable

cable types.

GENERAL SPECIFICATIONS

Construction: Plug-in

Connection: M3.5 screw terminals

Screw terminal: Chromated steel (standard) or stainless

steel

Housing material: Flame-resistant resin (black)

Isolation: CAS input or MV output to contact input or power

to re-transmitted output to contact output

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

Span adjustment: 98 to 102 % (front)

Indicator LED: RUN output (green), MAN status output (red),

UP command (red), DOWN command (red), MAN command

(red)

Programming: Programming Unit (model: PU-2x); Sliding-

back response time, UP-DOWN response time, alarm, etc.

(Refer to the users manual of JXCON for the adjustments

configurable with JXCON.)

Alarm output: RUN contact turns off when the high/low

alarm for the CAS input trips.

INPUT SPECIFICATIONS

■ CAS Input: 4 – 20 mA DC

Input resistance: 25 Ω in manual control mode

■ Contact Input: MAN control command and UP/DOWN

command

Sensing: 5 V DC @ 3 mA

Detection levels

ON resistance: ≤ 200 Ω, ≤ 0.80 V

OFF resistance: ≥ 100 kΩ, ≥ 4.95 V

OUTPUT SPECIFICATIONS

■ MAN Output: 4 – 20 mA DC

Load resistance

• CAS control mode: Allowable load for CAS signal minus

50 Ω

• MAN control mode: 0 – 750 Ω

■ Relay Output: MAN status and RUN output;

120 V AC @ 1 A or 24 V DC @ 1 A

Maximum switching voltage: 250 V AC or 30 V DC

Maximum switching power: 120 VA or 24 W

Minimum load: 5 V DC @100 mA

INSTALLATION

Current consumption

CAS mode: Approx. 120 mA at 24 V

MAN mode: Approx. 180 mA at 24 V

Operating temperature: -5 to +55°C (23 to 131°F)

Operating humidity: 30 to 90 %RH (non-condensing)

Mounting: Surface or DIN rail

Weight: 450 g (0.99 lb)

PERFORMANCE in percentage of span

Alarm setting accuracy: ±0.5 %

Re-transmitted output accuracy: ±0.4 %

CAS to MAN or MAN to CAS switching accuracy: ±0.5 %

MV output terminal is open during the time switching the

internal relay (≤ 10 msec.) when turning CAS to MAN or

MAN to CAS mode.

Temp. coefficient: ±0.015 %/°C (±0.008 %/°F)

Re-transmitted output response time: ≤ 20 msec.

memory)

Insulation resistance: ≥ 100 MΩ with 500 V DC

Dielectric strength: 1000 V AC @ 1 minute (CAS input or MV

output to contact input or power to retransmitted output to

contact output)

1500 V AC @ 1 minute (CAS input or MV output or contact

input or power or re-transmitted output or contact output to

ground)

OPERATING MODES

■ CASCADE CONTROL MODE

The JB2 allows the CAS input (cascade control signal) from

the PID controller to pass through at the MV output

terminals.

■ MANUAL CONTROL MODE

When the external MAN command contact is closed, the JB2

turns on to manual control mode. Actual output signal is

determined by following three operation modes:

MODE 1: Holds the CAS control signal at the moment of the

MAN command.

MODE 2: Goes back the preset time period and hold the

CAS control signal at that moment.

MODE 3: Holds a specific value preset by the Programming

Unit (PU-2x).

In this mode, the output can be manipulated with external

UP or DOWN commands.

When the MAN command contact is opened, the CAS control

signal is recovered with smooth transition.

■ TRANSITION FROM MAN TO CAS CONTROL MODE

The JB2 increases/decreases the MV output until it reaches