Jokab Safety JSHT1 Catalog Page
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6:30
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Safety timer
JSHT1
Approvals:
TÜV Nord
Safety timer for:
Time reset
Time bypassing
Features:
Hardwire time selection
5 – 40 s
Selectable single or dual
channel input
Test input
Width 45 mm
The JSHT1A/B closes two independent relay outputs
during a guaranteed maximum time when the inputs
are opened.
Time reset
Time reset can prevent uni ntentional reset of safety systems when someone is still in the dangerous area of the
machine. During a guaranteed maximum time, one or several PB´s for reset must be activated. The reset buttons
should be sited in such a way that operatives have a clear
overview of the whole area which is guarded. Time reset
is made by the combi nation of a safety relay and the timer
relay JSHT1A/B.
Time bypassing
The JSHT1 can also be used for time bypass of light
beams for e.g. autotruck into a dangerous area.
Operation
When the inputs open the output contacts close. The output contacts open when the inputs close or when the time
period has expired. The time period is hardwire selectable
on terminals T1, T2 and T3. The time given is the maximum
time. One or two channel operation is also hardwire selectable.
Regulations and standards
The JSHT1A/B is designed and approved in accordance with
appropriate directives and standards. See technical data.
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”.
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2
Light beam being bypassed
for a maximum pre-set time
e.g. 5 sec. by the JSHT1
during entrance and exit with
the JSHD4 Three Position
Enabling device.
Time reset procedure. First push
PB1, then exit dangerous area and
close the door, then push PB2
(PB1 and PB2 must be pressed
within the predetermined time period selected). After this procedure
the machine can be safely restarted.
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Technical data – JSHT1 A/B
mm
1 2 0
7 4
45
Manufacturer ABB AB/Jokab Safety, Sweden
Article number/Ordering data
JSH T1A 24 DC 2TLJ010011R0000
JSH T1B 24 DC 2TLJ010011R1000
Colour Black and beige
Power supply 24 VDC ± 15 %,
Power consumption 1,8 W/3,7 VA
Max Input Wire res. at nom
voltage/channel
Response time at activation <30ms
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
Conditional short-circuit current
(1 kA) 6A gG
Max Input Wire res. at nom.
voltage 100 Ohm
24/48/115/230 VAC ± 15 %,
50 - 60 Hz (AC versions JSHT1A
only)
100/200 Ohm (1 Channel/
2 Channel)
JSHT1A: 5-10-15-20 sec
JSHT1B: 5-15-30-40 sec
not exceeded 100 mA)
Terminals (Max. screw torque
1 Nm)
Single strand: 1 x 4 mm2, 2 x 1,5 mm
Conductor with socket contact: 1 x 2,5 mm2, 2 x 1 mm
Mounting 35 mm DIN-rail
Protection class enclosure/
terminals IP20/IP40 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: 330 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: 430 g
Category 4 / PL e (EN ISO 13849-
1:2 008)
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)
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2
1
2
3
4
5
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Technical description – JSHT1 A/B
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 closed
and then opened. Thereafter K1 and K2
Timer
** Only for AC-supply.
are activated and the outputs close. K1
and K2 are activated for the hardwired
selected time (set by connections on the
terminals T1, T2 and T3). If there is a short
circuit between the inputs or the inputs
Electrical connection – JSHT1 A/B
7
8
are closed 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 closed and both internal
relays K1 and K2 deactivated (cont rol led by
the super vising circuit) and the inputs again
opened.
By external hardwire connections the
JSHT1 can be made single or dual channel input. See figure below.
Connection for dual channel inputConnection for single channel input
9
10
11
Selection of time by hardwire links
JSHT1A JSHT1B
* 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.
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