Jokab Safety JSHT2 Catalog Page

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Safety timer

JSHT2

Approvals:

TÜV Nord

Safety relay for:

Time bypassing

Inching

Features:

Hardwire time selection

0.2 – 40 s

Selectable single or dual channel input

Test input

Width 45 mm

The JSHT2A/B/C closes two independent relay outputs during a guaranteed maximum period of time when the inputs are closed.

Time bypassing

Sensors detect the autocarrier and are connected to the JSHT2 which supervises the sensors and by pas ses the light beam for a maximum predeter mined time.

Inching

Inching applications require safety outputs to be closed for a predetermined maximum period of time, allowing the machine to move only a short distance each time the inching control is activated. For each new motion the inching control e.g. PB or pedal must be released and activated again.

Operation

When the inputs close the output contacts close. The output contacts open when the input opens or when the time period has expired. The time is hardwire selectable on the terminals T1, T2 and T3. The time given is the maximum time. Single or dual channel operation is also hardwire selectable.

LED indication for supply, inputs and outputs

1+1 NO relay outputs

Supply 24 VDC, 24, 48, 115 or 230 VAC

Quick release connector blocks

Connection examples

For examples of how our safety relays can solve various safety problems, please see the section “Connection examples”.

Regulations and standards

The JSHT2A/B/C is designed and approved in accordance with appropriate directives and standards. See technical data.

Light beam being bypassed only for the time it takes the

auto carrier to pass.

Shaft only turns a small amount each time the PB is pressed.

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Technical data – JSHT2 A/B/C

1 2 0

7 4

Manufacturer ABB AB/Jokab Safety, Sweden Article number/Ordering data

JSHT2A 24 DC 2TLJ010012R0000 JSHT2B 24 DC 2TLJ010012R1000 JSHT2C 24 DC 2TLJ010012R2000

Colour Black and beige Power supply 24 VDC ± 15 %

Power consumption 1,8 W/3,8 VA Max Input Wire res. at nom

voltage/channel Response time at activation < 30 ms Response time at deactivation < 15 ms Selectable time

(± 15 % at nom. V.)

Relay outputs 2 x 1 NO Max. switching capacity

Resistive load AC 4A/250 VAC/10 00 VA Inductive load AC AC15 250VAC 3A Resistive load DC 4A/24 VD C/100 W Inductive load DC DC13 24VDC 2A

Max. total switching capacity: 8A distributed on all contacts Min. load 10m A /10 V (if load on contact has

Contact material AgCuNi Fuses Output (External) 3A gL/gG or 4A fast Max Input Wire res. at nom.

voltage 100 Ohm

24/48/115/230 VAC ± 15 %, 50 - 60 HZ

100/200 Ohm (1 Channel/ 2 Channel)

JSHT2A: 0.2 - 0.5 - 0.7 - 1.0 sec JSHT2B: 5 - 10 - 15 - 20 sec JSHT2C: 5 - 15 - 30 - 40 sec

not exceeded 100 mA)

Terminals (Max. screw torque 1 Nm)

Single strand: 1 x 4 mm2 or 2 x 1,5 mm Conductor with socket contact: 1 x 2,5 mm2 or 2 x 1 mm

Mounting 35 mm DIN-rail Protection class enclosure/

terminals IP 20/IP 40 IEC 60529 Impulse Withstand Voltage 2.5kV Pollution Degree 2 Operating temperature range –10°C to +55°C (with no icing or

Operating humidity range 35% to 85% LED indication Electrical Supply, Inputs, Outputs Weight 24 VDC: 310 g

Performance (max.)

Functional test: The relays must be cycled at least once a year.

Conformity 2006/42/EC, 2006/95/EC,

condensation)

24/48/115/230 VAC: 410 g. Safety Category 4/PL e (EN ISO

13849-1:2008) SIL 3 (EN 62061:2005) PFHd 4.42E-09

2004 /108/ EC EN 954-1:1996, EN 62061:2005 EN ISO 13849-1:2008

Connector blocks are detachable (without cables having to be disconnected)

Technical description – JSHT2 A/B/C

Connection and monitoring circuit

The electrical supply is connected across A1 and A2. The internal supervising circuit is activated directly when the supply is on. The inputs A and B must both be opened and then closed. Thereafter K1 and K2 are activated and the outputs close. K1 and K2 are activated for hardwired selected time

Timer

** Only for AC-supply.

(set by connections on the terminals T1, T2 and T3). If there is a short circuit between the inputs or the inputs are opened again before the set time period has expired the outputs will open. In order to close the outputs again both the inputs have to be opened and both internal relays K1 and

Electrical connection – JSHT2 A/B/C

K2 deactivated (controlled by the supervising circuit) and then the inputs closed again. By external hardwire connectors the JSHT2 can be made to operate from either single or dual channel inputs. See ﬁgure below.

Connection for dual channel inputConnection for single channel input

Selection of time by hardwire links

JSHT2A JSHT2B JSHT2C

* It is recommended that all switched loads are adequately suppressed and/or fused in order to provide additional protection for the safety contacts. In the ﬁgure the monitoring of two contactors in the test input is shown.