Low Voltage Operation Function; Related Parameters - Toshiba TOSVERT VF-S15 Instruction Manual

1. Introduction
VF-S15 is equipped with low voltage operation function which activates for back up operation using power
supply from battery.
This instruction manual explains low voltage operation function of VF-S15.

2. Low voltage operation function

Even the case of power failure, low voltage operation enables the inverter to continue operation by
switching its power supply to the battery. If power failure occurs during operation, undervoltage protecting
function activates and the inverter trips.
In case of momentary power failure, the inverter continues operation or restarts smoothly by the
parameters, Auto-restart control selection (f301) or Regenerative power ride-through control
(Deceleration stop) (f302).
If Auto-restart control selection (f301) or Regenerative power ride-through control (Deceleration stop)
(f302) is not available or if power failure continues for a longer period of time, low voltage operation
enables the inverter to continue minimum range of operation by supplying power from the battery.
After undervoltage protection activates, switch the power supply to the battery by inputting low voltage
operation signal from the input terminal. Next, execute the necessary operation and shut off the power
supply from the battery by cancelling the low voltage operation signal. Then, the inverter returns to normal
operation by inputting commercial power supply at power recovery.
When this function is activated, input phase failure detection is disabled regardless of the setting of Input
phase failure detection selection (f608).

3. Related parameters

Title
Low voltage operation upper limit
f297
frequency
f298
Low voltage operation DC voltage
Input terminal function
136
Low voltage operation signal
(137)
Low voltage operation mode activates by turning on this signal during undervoltage protection (moff).
*1:240V class: 4.0kW or less: 72 to 168Vdc､5.5kW or more: 96 to 168Vdc､
500V class: 4.0kW or less: 72 to 336Vdc､5.5kW or more: 120 to 336Vdc.
Function Arrangement range
0.0: Disabled
0.1-30.0 (Hz)
*1
ON
Low voltage operation
2
E6581918
Default setting
0.0
120
OFF
cancelled