Toshiba VF-PS1, VF-AS1 instruction manual Precautions, 

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Title	Function	Adjustment range
	Output signal selection of commercial	0 to 3
	power/inverter switching
*3	Inverter side switching waiting time	0.1 to 10.0 seconds
*3	Commercial power side switching waiting	0.37 to 10.0 seconds
	time
*1	Input terminal selection #6 (S2)	0 to 135
	Output terminal selection #1 (OUT1)	0 to 119
	Output terminal selection #2 (OUT2)	0 to 119

Setting value

1 (Automatic switching when

tripped)

Different for each model

0.62

20

(Emergency stop)

46

(Commercial power/inverter

switching output 1)

48

(Commercial power/inverter

switching output 2)

*1:Be careful about Items 5 and 7 in 1.3, “Precautions.”

*2:Due to internal processing timing, inverter-side wait time become 0.5 second longer than the setting value of  *3: and  are included the operation time of the relay and the magnet contactor.

In almost all cases, it is not necessary to change these parameter settings.

1.3. Precautions

1.Make sure to interlock the magnetic contactor (MC3) on the inverter output side with the commercial power supply magnetic contactor (MC1).

2.Magnetic contactor (MC2) can be omitted for normal operation but this is needed to isolate the inverter circuit in case a short-circuit fault occurs inside the inverter. Examine whether it should be installed or not considering the importance of the system concerned.

3.Check to make sure the phase sequence of the inverter and that of the commercial power supply are the same beforehand to maintain the motor’s rotational direction unchanged before and after the power switching.

4.In the  (Reverse-run prohibition), do not use the forward direction disable setting (=2). Switching to commercial power supply cannot be made because the inverter cannot run forward.

5.If the cause of the inverter trip was OCL (short-circuit on the load side at startup), E (emergency stop) or EF1, 2 (ground fault), commercial power supply /inverter switching output 1, 2 (output terminal selection 46, 48) are both shut off and MC1 and MC3 on both inverter and commercial power supply sides disabled and unable to turn on.

6.In case an inverter trip occurs, remove the cause of the protective action and then reset the inverter to start the inverter again.

7.S2 terminal (emergency stop) can be omitted, but it is needed as a circuit to detect a motor overload when the motor is operated on commercial power supply. Examine whether it should be installed or not considering the importance of the system concerned.

8.Regarding the selection of MCCB used when the backup circuit starts in star delta configuration, you have to consider the peak current when star connection is switched to delta connection.

9.In the case the motor’s connection is star-delta, use delta connection when the inverter is running. (Do not switch star delta connection while the inverter is running.)

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