Table of Contents
Advertisement
Note!
5.4
Safety device interface
Sentry safety relays have interfaces with inputs/outputs (I/O:s) for connections of safety
devices.
Inputs/Outputs
T1/T2 detect short circuits to +24 VDC or other OSSD signals and are designed for supplying
signals to different types of safety devices.
Note!
R1/R2 receives the signals from the safety devices.
Warning!
5.5
Test, start and reset interface
The safety relay has an interface for test, start and reset functions. The safety relay enters
inactive mode when at least one input is not accepted. The safety relay enters active mode
when the inputs are accepted, and a reset is performed.
5.6
Automatic reset
When at least one input signal is not accepted, the safety relay enters inactivated mode. The
MODE LED light blue and at least one of CH1/CH2 LED will turn OFF. When the safety input
signals are accepted and the test (X1/X4) circuit is closed, an automatic reset is made. The
relay activates and the three LEDs will light green.
5.7
Manual reset
Warning!
When at least one input safety signal is not accepted, the safety relay enters to inactive mode.
The MODE LED is blue and at least one of the CH1/CH2 LEDs will turn OFF and the reset button
light is static on.
When the safety input safety signals are accepted, the CH1 LED and the CH2 LED are green and
the MODE LED is blue. The reset button light is flashing to indicate that a reset is possible. To
reset the safety circuit, press the reset button for 0.05 s to 2 s. The relay goes to active mode
and the button light turns off when the button is released (falling edge).
A reset button light test can be executed by pressing the reset button in active mode.
5.8
Multi-reset
It is possible to use one reset button to reset up to ten safety relays while maintaining the
reset button light function.
2TLC010067M0201 Rev.G
Arc suppression for inductive loads is recommended to get a longer
lifetime for the relay contacts.
It is not necessary to connect T1/T2 to the safety devices. The safety
level may be reduced if T1/T2 are not used. Possible errors in the
connected safety devices and wires may not be identified.
The safety relays and the safety devices supplied with 24 VDC must be
connected to PELV/SELV power supply.
Always use the manual reset function when a reset button is installed.
15
Advertisement
Table of Contents
