Troubleshooting The Safety Relay - Agilent Technologies U1840A Medalist sj5000 Hardware Manual

11
Troubleshooting

Troubleshooting the Safety Relay

11-18
If the safety relay will not reset
Pressing ES RESET on the switch plate will reset the safety relay.
After a reset, the three indicator lights on the safety relay
should turn on.
If the safety relay will not reset:
• Check for 24 V supply across the relay terminals A1-A2.
• Check that the emergency stop and door interlock are
functioning correctly. This is done by checking the continuity
across terminals:
• Check S11 and S12 for continuity
• Check S21 and S22 for continuity
• Check the three indicator lights on the safety relay. If the
three lights are on, the relay is functioning correctly.The top
light indicates the power is on. The two bottom lights
representing circuit number 1 and circuit number 2.
• Check that all contacts and terminations are intact.
• Check the reset circuit activated by the hardware pushbutton
that shorts out terminals XB5-11 and XB5-12 on the control
panel.
• If the emergency stop is on and there is no message on the
monitor, check PLC input 00.02. Check that the LED on the
PLC is on. If the LED is not on, reset the PLC.
Agilent U1840A Medalist sj5000 Hardware Manual