Toshiba TOSVERT VF-S15 series Bedienungsanleitung

E6581918

TOSVERT VF-S15

Low voltage operation Instruction Manual

E6581918

- Contents -

1. Introduction 2

2. Low Voltage Operation Function 2

3. Related Parameters 2

Example of Low Voltage Operation 4

E6581918

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.

E6581918

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

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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