Toshiba Tosvert VF-A5 User Manual (English)

Questions and Answers:

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Jennifer LunaAug 13, 2025
How to fix overcurrent during acceleration on Toshiba Tosvert VF-A5?
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  Maria RochaAug 14, 2025
  If you are experiencing overcurrent during acceleration in the DC section of your Toshiba Inverter, there are several potential causes and solutions: * If the acceleration time is too short, increase it. * If the V/f selection is incorrect, check the V/f pattern setting. * If the start was attempted on a rotating motor after a momentary power failure, use auto-restart or regeneration power ride-through control. * If a special (low impedance) motor is being used, try inserting an AC reactor on the output. * If none of the above, try increasing the carrier frequency.
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Michael HendersonAug 18, 2025
What to do if Toshiba Inverter shows overvoltage during deceleration?
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  Anita YuAug 18, 2025
  If your Toshiba Inverter is showing an overvoltage error during deceleration, consider the following: 1. If the deceleration time is too short, increase it. 2. If the amount of regenerated power is too large, install a dynamic braking resistor. 3. If the DBR resistance value is too large, decrease the dynamic braking resistance value. 4. If the dynamic braking function is OFF, select the dynamic braking function. 5. If OP stall is OFF, select OP stall. 6. If the input voltage fluctuated abnormally, try inserting an input AC reactor.
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Samantha JohnstonAug 21, 2025
Why Toshiba Tosvert VF-A5 shows overvoltage during acceleration?
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  Connie HughesAug 21, 2025
  If your Toshiba Inverter shows an overvoltage error during acceleration, it could be due to several reasons: * The input voltage fluctuated abnormally. Try inserting an input AC reactor. * The power source capacity is 500kVA or more. Use auto-restart or regeneration power ride-through control. * Power-factor improvement capacitors went on-line/off-line. * A device using thyristors is connected to the same power line. * Start was attempted on a rotating motor after a momentary power failure, etc.
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Dr. Stephanie WoodAug 26, 2025
What to do if Toshiba Inverter has overcurrent on load-side during start-up?
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  Karen CostaAug 26, 2025
  If your Toshiba Inverter is experiencing overcurrent on the load-side during start-up, consider these potential solutions: * Check the condition of the wiring and insulation, as the output main circuit wiring or motor insulation may be faulty. * Change the setting of the output short circuit detection selection, as the motor impedance may be too small.
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danielletorresAug 28, 2025
How to resolve overcurrent during constant speed run on Toshiba Tosvert VF-A5?
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  Kurt KellerAug 29, 2025
  If you're encountering overcurrent during constant speed run in your Toshiba Inverter, it could be due to: * A sudden change in load. Reduce the load fluctuations. * A faulty load. Check the load equipment.
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Katherine GonzalezSep 1, 2025
What causes W-phase armature short circuit GCR3 on Toshiba Inverter?
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  Stephen MasonSep 1, 2025
  The main circuit W-phase power transistor may be faulty. Check the main circuit W-phase power transistor and replace the transistor element if necessary.
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Troy WillisSep 5, 2025
What causes V-phase armature short circuit OCF12 on Toshiba Tosvert VF-A5?
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  Cynthia Warren MDSep 5, 2025
  The main circuit V-phase power transistor may be faulty. Check the main circuit V-phase power transistor and replace the transistor element if necessary.
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Timothy ObrienSep 8, 2025
What causes U-phase armature short circuit OCR on Toshiba Inverter?
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  James RubioSep 9, 2025
  The main circuit U-phase power transistor may be faulty. Check the main circuit U-phase power transistor. The transistor element must be replaced.