Mitsubishi Electronics FR-S500 instruction manual Design information

Design information

1.8 Design information

1)Provide electrical and mechanical interlocks for MC1 and MC2 which are used for commercial power supply-inverter switchover.

When the wiring is incorrect or if there is a commercial power supply-inverter switch-over circuit as shown below, the inverter will be damaged by leakage current from the power supply due to arcs generated at the time of switchover or chattering caused by a sequence error.

2)If the machine must not be restarted when power is restored after a power failure, provide a magnetic contactor in the inverter's primary circuit and also make up a sequence which will not switch on the start signal.

If the start signal (start switch) remains on after a power failure, the inverter will automatically restart as soon as the power is restored.

3)Since the input signals to the control circuit are on a low level, use two or more parallel micro signal contacts or a twin contact for contact inputs to prevent a contact fault.

4)Do not apply a large voltage to the contact input terminals (e.g. STF) of the control circuit.

5)Always apply a voltage to the alarm output terminals (A, B, C) via a relay coil, lamp etc.

6)Make sure that the specifications and rating match the system requirements.

1) Commercial power supply-inverter	3) Low-level signal contacts
switchover

			MC1
Power	R	U	Interlock
supply			IM
	S	V
			MC2
	T	W	Leakage current	Low-level signal contacts	Twin contact
	Inverter

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WIRING

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