Toshiba TOSVERT VF-S15 series User manual

E6581918
TOSVERT VF-S15
Low voltage operation Instruction Manual

E6581918
- Contents -
1. Introduction 2
2. Low Voltage Operation Function 2
3. Related Parameters 2
4. Example of Low Voltage Operation 4
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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 Function Arrangement range Default setting
f297 Low voltage operation upper limit
frequency 0.0: Disabled 0.1-30.0 (Hz) 0.0
f298 Low voltage operation DC voltage *1 120
Input terminal function ON OFF
136
(137) Low voltage operation signal Low voltage operation cancelled
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.
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f297 : Low voltage operation upper limit frequency
When Low voltage operation upper limit frequency (f297) =0.0, this function is disabled. When this
function is activated, set this parameter larger than 0.1Hz.
During low voltage operation, frequency set with this parameter is the upper limit frequency. Even
though the frequency is set to the value lower than Lower limit frequency (ll), Low voltage operation
upper limit frequency (f297) is the upper limit.
Low voltage operation upper limit frequency (f297) is calculated as follows;
f297<(vl/vlv)×(Battery voltage/ 2)
As battery voltage lowers by operation, leave the margin for the value of the Low voltage operation
upper limit frequency. In addition, if the voltage to the motor is lower than the V/F value, current
increases. Set Low voltage operation upper limit frequency using the above formula to avoid such
current increase.
[Example]
In case vl=60Hz, vlv=200V, and battery voltage =DC120V
f297<25Hz: Set about 20Hz.
f298 : Low voltage operation DC voltage
This is the lowest voltage for the low voltage operation. Undervoltage protection (moff) will be
cancelled for the voltage higher than the voltage set with this parameter.
f298 < battery voltage (Vdc)
In order to leave the margin, set the low value comparing to the battery voltage actually used.
[Example]
In case 200V class inverter and battery voltage = DC120V
f298<120V: Set about 100V.
■Setting example of input terminal
In case of setting low voltage operation signal to Terminal S1
Title Function Arrangement range Default setting
f114 Input terminal selection 4A (S1) 0-203 136
(Low voltage operation signal)
Set value 137 is the inversion signal.
Note 1: Low voltage operation signal is enabled only when the inverter is in undervoltage status. Turn on this
signal while the inverter is in undervoltage status. If this signal is input during operation, the inverter
does not recognize Low voltage operation signal.
Note 2: Normal operation is enabled during low voltage operation, but output frequency is controlled by Low
voltage operation upper frequency (f297).
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4. Example of Low voltage operation
<Example>
1. Switch to the battery
- Undervoltage protection (moff) activates after power failure.
- Be sure to turn off the power supply so that voltage is not applied to the battery when the power
supply is recovered.
- Switch to the battery. Undervoltage protection (moff) is still displayed.
- Display of moff may disappear by power interruption after power failure and during switching to
battery.
2. Input of Low voltage operation signal
- Low voltage operation mode activates by turning on the low voltage operation signal of Terminal S1
while the inverter is in Undervoltage protection (moff) status.
- Undervoltage protection (moff) is cancelled with the voltage more than the value set with Low
voltage operation DC voltage (f298).
3. Low voltage operation
- Low voltage operation activates by inputting the operation command.
- If frequency command is larger than the value set with Low voltage operation upper limit frequency
(f297), the frequency is up to f297.
4. Cancellation of Low voltage operation mode
- After necessary operation is completed, Low voltage operation mode is cancelled by turning off the
Low voltage operation signal of Terminal S1 while the inverter stops, and the inverter returns to
normal operation.
- Undervoltage protection (moff) activates.
- Turn off the battery.
- Normal operation is enabled by turning on the power after power supply recovery.
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