Allen-Bradley Guardmaster - Check the Safety Outputs (Step 6); Electromechanical Output Issues

78 Rockwell Automation Publication 440R-UM013E-EN-P - March 2017
Chapter 11 Troubleshooting
Check the Safety Outputs
(Step 6)
The GSR family of 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 solid 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 75
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).
Figure 75 - Measure the Terminal Voltage
Step Description
1 The voltage at 13 must be the same as the supply voltage. If not check for an open circuit (broken
wire), blown fuse, or tripped circuit breaker.
2 The voltage at 14 must be the same as the supply voltage. If not, the positive-guided relay inside the
GSR relay is not closing. Measure the contact resistance; see Figure 76 on page 79.
3 The voltage at A1 must be the same as the supply voltage. If not, check for an open circuit (broken
wire) between terminal 14 and A1.
4 The voltage at A2 must be zero. If not, check for an open circuit between A1 and the voltage supply
ground connection. If A2 measures zero volts and A1 measures the supply voltage, then K1 is not
operating properly and must be replaced.
14
24
+Vs
13
OUT
23
Volts
DMM
K2
A2
A1
+Vsupply
0V
1
2
K1
A2
A1
3
4