Wiring FP07 − 47.1 Safety Instructions7.1.4 Momentary Power FailuresIf the duration of the power failure is less than 5 ms, the FP0 continues to operate. Ifthe power is OFF for 5 ms or longer, operation changes depending on the combinationof units, the power supply voltage, and other factors. (In some cases, operation maybe the same as that for a power supply reset.)If operation is to be continued following recovery from the momentary power failure, usean automatic retaining sequence program that uses a hold type internal relay.7.1.5 Protecting Power Supply and Output SectionsAn insulated power supply with an internal protective circuit should be used. The powersupply for the control unit operation is a non-insulated circuit, so if an incorrect voltageis directly applied, the internal circuit may be damaged or destroyed. If using a powersupply without a protective circuit, power should be supplied through a protectiveelement such as a fuse.If current exceeding the rated control capacity is being supplied in the form of a motorlock current or a coil shorting in an electromagnetic device, a protective element suchas a fuse should be attached externally.
