2TLC172316M0201, rev E
5
www.abb.com/ jokabsafety
2015-09-30
2 Overview
General description
This manual contains information on using the safety relay in control circuits that are related to functional safety.
The BT50(T) is designed to connect safety devices, such as emergency stops, directly in the voltage supply circuit
to the relay. This relay can be used to expand the safety outputs of Pluto.
The relay has three NO safety outputs, one NC output (for monitoring purposes), a test input and complete internal
supervision.
In order for the safety outputs to close, the supply voltage, e. g. by means of an emergency stop button, must be
connected to A1 and A2 and the test input closed. After actuation of the relay the test input can be opened again.
The test input is intended to supervise that contactors or valves have deactivated before a new start can be
permitted. The test input can also be used for starting and the start button can be supervised. (See the connection
examples in section 4.)
Safety regulations
Warning!
Carefully read through this entire manual before using the device.
The devices shall be installed by a trained electrician following the Safety regulations, standards
and the Machine directive.
Failure to comply with instructions, operation that is not in accordance with the use prescribed in
these instructions, improper installation or handling of the device can affect the safety of people
and the plant.
For installation and prescribed use of the product, the special notes in the instructions must be
carefully observed and the technical standards relevant to the application must be considered.
In case of failure to comply with the instructions or standards, especially when tampering with
and/or modifying the product, any liability is excluded.
