380 Volt - 0.75 kw TOSHIBA VFD

Power source: 380 Volt AC

Output Power : 0.75 kw

Output Current:  2.3 Amper

Toshiba VF-PS1 Series VFD

Method of lubricating load mechanisms
Operating an oil-lubricated reduction gear and gear motor in the low-speed areas will worsen the lubricating effect.
Check with the manufacturer to find out about operable speed range.

Low loads and low inertia loads
The motor may demonstrate instability such as abnormal vibrations or overcurrent trips at light loads of 50% or under of the rated load, or when the load's moment of inertia is extremely small. If that happens reduce the carrier frequency.

Occurrence of instability
Unstable phenomena may occur under the load and motor combinations shown below.
• Combined with a motor that exceeds applicable motor ratings recommended for the inverter
• Combined with special motors
To deal with the above lower the settings of inverter carrier frequency. (When performing vector control, set the carrier frequency at 2kHz or more. If the carrier frequency is set below 2kHz, it will be automatically corrected to 2kHz by the inverter.)
• Combined with couplings between load devices and motors with high backlash In this case, set the S-pattern acceleration/deceleration function and adjust the response time inertial moment
setting during vector control or switch to V/f control.
• Combined with loads that have sharp fluctuations in rotation such as piston movements. In this case, adjust the response time inertial moment setting during vector control or switch to V/f control .

Braking a motor when power supply is lost
A motor with its power cut off goes into freewheel, and does not stop immediately. To stop the motor quickly as soon as the power is cut off install an auxiliary brake. There are different kinds of brake devices, both electrical and mechanical. Select the brake that is best for the system.

Loads that generate negative torque
When combined with loads that generate negative torque the protection for overvoltage and overcurrent on the inverter will go into operation and may cause a trip. For this kind of situation, you must install a dynamic braking resistor, etc. that complies with the load conditions.

Motor with brake
If a brake motor is used with the braking circuit connected to the output terminals of the inverter, the brake cannot be released because of a voltage drop at startup. Therefore, when using the inverter along with a brake motor, connect the braking circuit to the power supply side of the inverter, as shown in the figure below. In most cases, the use of a brake motor causes an increase in noise at low-speed.

Protecting inverters from overcurrent
The inverter has an overcurrent protection function. The programmed current level is set to the inverter's maximum applicable motor. If the motor used has a small capacity, the stall prevention level, overcurrent level and the motor electronic thermal protection must be readjusted. If adjustment is necessary, refer to Section 5.14, and make adjustments as directed.

Inverter capacity
Do not operate a large capacity motor with a small capacity (kVA) inverter even with light loads. Current ripple will raise the output peak current making it easier to set off the overcurrent trip.

Power factor correction capacitor
Power factor correction capacitors cannot be installed on the output side of the inverter. When a motor is run that has a power factor correction capacitor attached to it, remove the capacitors. This can cause inverter malfunction trips and capacitor destruction.

Display of alarm, pre-alarm, etc.
When the inverter alarm, pre-alarm, etc. occurred, the contents are displayed. (Some are not displayed.)
Listed below ones can be monitored via communication (FC91). Refer to 13.1 for the other alarms.
 
0 Overcurrent pre-alarm
1 Inverter overload pre-alarm
2 Motor overload pre-alarm
3 Overheat pre-alarm
4 Overvoltage pre-alarm achieving PBR operation level  
5 Main circuit undervoltage detected
6 (Reservation area) -
7 Low current alarm -
8 Overtorque detection -
9 Braking resistor overload pre-alarm
10 Cumulative operation time alarm 
11 PROFIBUS/DeviceNet/CC-Link communication error
12 RS485 communication error
13 (Reservation area) -
14 Forced deceleration stop because of a momentary power failure
15 Pre-alarm stop because of prolonged lower-limit frequency operation

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+ Toshiba VF-PS1 User manual

+ Toshiba Vf-PS1 Fault codes

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+ Toshiba Price list

+ VFD main Page

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