Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 67
Chapter 11 Troubleshooting
Two-handed Reset Operation
Reset signals for GSR safety relays can be pressed 10 ms after the relay inputs
are satisfied. Therefore, GSR safety relays are useful for application scenarios
such as:
• The application has an E-stop mounted close to the reset button, which
allows you to release the E-stop with one hand and press the reset button
with the other.
• The application allows you to close a safety gate with one hand and press
the reset button with the other hand.
Applications with OSSD Outputs and Test Pulses
If your application uses an OSSD output with test pulses as the source of the
reset signal, the GSR safety relays execute the reset function properly as shown
in Figure 75
.
Test pulses are much less than 1 ms long. GSR safety relays ignore test pulses
up to 6 ms in duration. Figure 75
shows a reset signal that is 2500 ms long.
During this time, a 6 ms test pulse occurs. This test pulse is ignored. A test
pulse of 7 ms causes the GSR safety relay to execute the reset function,
provided the test pulse occurs after 250 ms.
Figure 75 - Reset Input Ignores Test Pulses Up to 6 ms
Check the Safety Outputs
(Step 6)
The GSR family of safety relays has two types of outputs:
• Electromechanical outputs: CI, DI, EM, EMD, and SI safety relays
• OSSD outputs: DIS safety relay
Electromechanical Output Issues
If the OUT status indicator is steady green, but the output device does not
energize, begin troubleshooting by measuring the terminal voltage.
Measure the Terminal Voltage
Confirm that voltage is present at the relay terminals and the load. Figure 76
on page 68 shows an example of the measurement points for one output
channel (13/14). Since most safety circuits consist of two channels, repeat the
checking on the second channel (23/24).
Ignores Test
Pulse up to
6ms
Reset occurs on trailing edge
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