Cautions For Automatic Torque Boost And Vector Control; Cautions For Pm Motor Control; Cautions For Motor Control - Toshiba TOSVERT VF-AS3 Instruction Manual

■ Cautions for automatic torque boost and vector control

• Look at the motor name plate and be sure to set the following parameters.
- <vL: Base frequency 1> (Rated frequency)
- <vLv: Base frequency voltage 1> (Rated voltage)
- <F405: Motor rated capacity>
- <F415: Motor rated current>
- <F417: Motor rated speed>
• The vector control exerts its characteristics effectively within the speed range of <vL: Base
frequency 1>. The same characteristics will not be obtained in speed ranges over the base
frequency.
• When using vector control, set <vL: Base frequency 1> in the range of 40 to 120 Hz.
• Use a three-phase motor with a capacity that is the same as the inverter's rated capacity or one
rank below. The minimum applicable motor capacity is 0.1 kW.
• Use a motor that has 2 to 16 P.
• Operate one motor in combination with one inverter. Vector control cannot be used when one
inverter is operated with more than one motor. When using a combination of several motors, set
<Pt> to "0: V/f constant".
• The maximum length of wires between the inverter and motor is 30 m. If the wires are longer than
30 m, be sure to perform offline auto-tuning with the wires connected. However, the effects of
voltage drop due to resistance of wiring cause motor-generated torque in the vicinity of base
frequency to be somewhat lower.
• When a reactor or motor-end surge voltage suppression filter is connected between the inverter
and a motor, the motor's generated torque may fall. Performing offline auto-tuning may also cause
a trip "Etn1". When a trip has occurred, connect the inverter and the motor directly to perform
offline auto-tuning, or set motor parameters by referring to the test record of the motor.
• Attach the speed sensor used for PG feedback control directly to the motor. If it is attached via a
gear, etc., rigidity is not ensured, causing hunting of the motor or a trip of the inverter.
• If the motor is not connected or a motor with extremely small capacity is connected for operation
for the purpose of operation check of the inverter, etc., set <Pt> to "0: V/f constant" temporarily. If
it is set to Automatic torque boost or Vector control, normal operation may not be possible.
• <Pt: V/f Pattern> is valid only with No.1 motor.
Memo
• If it is switched to No.2 to 4 motor, V/f constant control is applied regardless of the setting of
<Pt>.

■ Cautions for PM motor control

• If the motor is not connected or a motor with extremely small capacity is connected for operation
for the purpose of operation check of the inverter, etc., set <Pt> to "0: V/f constant" temporarily. If it
is set to PM motor control, normal operation may not be possible.

■ Cautions for motor control

• Set the upper limit for frequency command to a value which is three or four times the value of
<vL>.
• The value of run frequency is limited to a value which is ten times or less the values of <vL>, and
the alarm "A-05" will appear when it is exceeded.
• If the inclination of the set V/f is over 8.25%/Hz, the alarm "A-02" will appear.
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5. [Fundamental operation] How to use parameters
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