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Jokab Safety
North America
Ph: 888-282-2123
Fx: 800-565-9302
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Safety Relays Summary
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Which Safety Relay should you choose?
First of all, we would recommend the selection of one of our latest universal relays in the RT-series. These are both practical and cost effective. To facilitate the choice of safety relay or combinations of safety relays, please see...
Note: All earlier type of relays that can now be replaced by those in this manual are still kept as stock items and can be supplied upon request.
Input Alternatives
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Single-Channel, 1 NO from +24V
Safety Category 1 |
Two-Channel, 2 NO from +24V
Safety Category 3 |
Two-Channel, 1 NO & 1NC from +24V
Safety Category 4 |
Two-Channel, 1 NO from 0V & 1 NO from +24V
Safety Category 4 |
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The input must be closed before the outputs can be activated. A stop signal is given when the input is opened.
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Both the inputs must be closed before the outputs can be activated. A stop signal is given if one or both of the inputs are opened. Both the inputs must be opened and reclosed before the outputs can be reactivated. A short-circuit between the inputs is not monitored by the safety relay. Category 4 can only be achieved if a safety device with short circuit monitored outputs is connected.
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One input must be closed and one must be opened before the outputs can be activated. A stop signal is given if one or both of the inputs change position or if the inputs short-circuit. Both inputs must be put into their initial position before the outputs can be reactivated.
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Both the inputs must be closed before the outputs can be activated. A stop signal is given if one or both of the inputs are opened. Both the inputs must be opened and reclosed before the outputs can be reactivated. Stop signal is given if there is a short-circuit between the inputs.
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Note: If serial contacts are connected to the input the Safety Category is made lower for two-channel connections
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Contact Strips / Safety Mats
Safety Category 1 |
Monitored Manual Reset
Safety Category 4 |
Automatic / Unmonitored Manual Reset |
Testing of Contactors, Relays & Valves |
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For an unpressurised mat/strip, both the relay inputs must be closed for the outputs to be activated. In the case of an activated mat/strip and short-circuit input channels, the relay will be de-energized. Current limitation prevents the safety relay from being overloaded when the channels short-circuit.
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A monitored reset means that the safety relay will not be reset if the reset button gets jammed when pressed in or if the input short-circuits. In order for the resetting to be complete, the input must be closed and opened before the outputs can close.
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Automatic reset means that the outputs are closed immediately when both the input conditions are satisfied and the test input is closed.
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Can be carried out with both automatic and manual reset.
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Applies to Light Beams with Dual Outputs
