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Precautions for the use of an inverter to operate the blower.
1) The standard motor may not be used for the operation in some cases as shown below.
・
In the case of no margin for temperature rise in the motor
2) At factory shipment, the setting of a commercial inverter is not suitable for the blower.
Change the following values at least.
・
Base frequency: Adjust to the rated frequency of the blower (50 Hz or 60 Hz).
・
Highest frequency: Adjust to the rated frequency of the blower.
・
Maximum output voltage: Adjust to the rated voltage of the motor.
・
Upper-limit frequency: Highest frequency: Adjust to the rated frequency of the blower.
・
Lower-limit frequency: 25 to 30 Hz (based on the cooling characteristics of the motor).
・
V/f characteristics: Change to square reduction torque.
・
Acceleration time: 30 to 60 sec. or more If the acceleration time is short, an over-current error
may occur.
・
Deceleration time: 30 to 60 sec. or more If the decceleration time is short, a regenerative current
error may occur.
3
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Other precautions
・
Vibrations of components (belt, casing, etc.) making up the blower may increase at a specific
frequency. If the increase in vibration cannot be eliminated even after other set values are
changed, a resonance point may be causing it. In such a case, set the jump frequency to
prevent the increase in frequency.
・
If the blower is installed on a vibration isolation table (rubber, spring, etc.), a decrease in
frequency may become a resonance frequency. In such a case, set the jump frequency to prevent
this symptom (otherwise, the blower and motor are individually affected).
・
If the carrier frequency is set higher, current leakage may increase, and the earth leakage
breaker may be activated.
・
Do not use the inverter output power for applications other than electric motors.
For details, see “Use of inverter (frequency converter)” on page 20.
