SAFETY RELAY – VIEW OF INTERIOR OF CONTROL CONSOLE SHOWN BELOW
The Safety Relay, has 2 led indicators, both must be lit indicating that the safety circuit is satisfied. Without that circuit closed the machine will not start.
If turning the key switch on the front of the control console on starts the hydraulic motor this indicates that the safety circuit is not complete. The key switch bypasses both of the door interlock switches and the emergency stop push button.
Safety Circuit Schemata
Testing / Troubleshooting
The object is to see both of the led’s on the safety relay light up. Check for 24vDC on the output side of the 7FU fuse before starting the troubleshooting process.
First – Use a jumper wire connected to terminal OvDC and connect the other end of the jumper wire to terminal HS3, if no change in condition move the wire from HS3 to HS2, if no change, finally connect the end of the wire to terminal A2 at the safety relay.
If no change, remove the jumper wire from terminal OvDC and from terminal A2 at the safety relay.
Second – Connect the jumper wire to a terminal labeled 24vDC and connect the other end of the jumper wire to terminal HS1, if no change remove the jumper wire from terminal HS1 and connect to terminal A1 at the safety relay.
Posted in: Troubleshooting