Toshiba VF-AS1 - Manual (Page 7)

E 6 5 8 1 3 6 4
6
Title Function Adjustment range Setting value

Output signal selection of commercial
power/inverter switching
0 to 3
1 (Automatic switching when
tripped)

*3
 Inverter side switching waiting time 0.1 to 10.0 seconds Different for each model
 *3 
Commercial power side switching waiting
time
0.37 to 10.0 seconds 0.62

*1
 Input terminal selection #6 (S2) 0 to 135
20
(Emergency stop)
 Output terminal selection #1 (OUT1) 0 to 119
46
(Commercial power/inverter
switching output 1)
 Output terminal selection #2 (OUT2) 0 to 119
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.)