JSHT2 A/B/C Safety Timer
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Technical Data
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Manufacturer.................................. JOKAB SAFETY
Ordering Data........ JSHT2A/B and supply voltage
or JSHT2C (only 24 VDC)
Color................................................. black and beige
Weight......... 310 g (24 VDC), 410 g (24-230 VAC)
Power Supply................................. 24 VDC+/-15%,
24/48/115/230 VAC
+/-15%, 50-60 Hz (AC versions JSHT2A/B only)
Power Consumption....................................... <3 VA
Relay Outputs.............................................. 2 x 1 NO
Maximum switching
capacity res. load AC............. 4A/250 VAC/1000 VA
Maximum switching
capacity res. load DC................. 4A/24 VDC/100 W
Minimum load.......................................... 10mA/10 V
(if load on contact has not exceeded 100 mA)
Maximum input wire
res. at nom. voltage........................... 100/200 Ohm
(1 Channel/2 Channel)
Response Time
At activation.................................................... <30 ms
At deactivation............................................... <15 ms
Selectable Time (+/-15% at nom. voltage)
JSHT2A...................................... 0.2-0.5-0.7-1.0 sec
JSHT2B............................................ 5-10-15-20 sec
JSHT2C............................................ 5-15-30-40 sec
Mounting.......................................... 35 mm DIN rail
Operating Temperature
Range................................................ -10ºC to +55ºC
Function Indication..................... Electrical supply,
inputs, outputs
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Contact Material........................................... AgCuNi
Terminals
Maximum screw torque.................................... 1 Nm
Single strand......................... 1x4mm2/2x1.5mm2
Conductor
with socket contact............... 1x2.5mm2/2x1mm2
Air and creep distance.............. 4kV/2 IEC 60664-1
Protection Class
Enclosure........................................ IP 40 IEC 60529
Connection blocks......................... IP 20 IEC 60529
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Technical Description
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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 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 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 K2 deactivated (controlled by the supervising circuit) and the inputs again closed.
By external hardwire connections the JSHT2 can be made single or dual channel input. See figure below.
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Light beam being only bypassed during the time it takes for the autocarrier to pass.
Shaft only turns a small amount each time the PB is pressed.
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Electrical Connections
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Connection for single channel input.
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Selection of time by hardwire links.
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Connection for dual channel input.
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* 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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