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PRSU Series, Operating Instructions Manual (Revision 1.0)
Maintenance Info and Replacement Procedure
The safety relay controller works without maintenance.
For replacement of the device, follow the procedure below:
1. Turn OFF and disconnect the source of applied power to the device.
Ensure that no terminal of the device is connected to a live voltage before continuing.
2. Unscrew terminals A1 and A2 from the device before removing any other connections.
3. One at a time, free connections from the device's terminal blocks by
unscrewing. Ensure that freed conductors are not left in the vicinity of live voltage
conductors.
4. Insulate wire ends if necessary.
5. When all connections are freed, remove the defective device from the DIN rail.
6. Mount new device to the DIN rail (see Page 8, Figure 4).
7. Perform "Device Startup Verification" procedure described earlier on Page 6 of this
manual.
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