User Manual of A90 Series Inverter
6
front of the motor.
Operation above power frequency
This inverter can provide the output frequency of 0.00Hz to 600.00Hz/0.0Hz to 3,000.0Hz.
When the motor needs to operate above the rated frequency, please consider the capacity of
the mechanical device.
About motor heat and noise
Since the inverter outputs PWM waves, containing some harmonics, the temperature rise,
noise and vibration of the motor will be slightly more than those in operation at the power
frequency.
Presence of voltage-dependent device or capacitor increasing the power factor on
output side
The inverter outputs PWM waves. If there is a capacitor increasing the power factor or
voltage-dependent resistor for lightning protection on the output side, the inverter may be
subjected to instantaneous overcurrent and even damage. Do not use these devices.
Use beyond rated voltage
The A90 series open-loop vector inverter should not be used beyond the allowable working
voltage range specified in this manual; otherwise, the components inside the inverter are
prone to damage. If necessary, use the appropriate step-up or step-down device for voltage
transformation.
Lightning impulse protection
The inverter of this series is equipped with a lightning overcurrent protector, which has
certain capabilities in self-protection against induced lightning. Where lightning strikes
occur frequently, a protective device should be added in front of the inverter.
Altitude and derating
In areas with an altitude of more than 1,000 m, where heat dissipation of the inverter is poor
due to thin air, derating is required (derating by 1% per 100 m altitude increase to
maximum 3,000 m; for ambient temperature above 40°C, derating by 1.5% per 1°C
temperature rise to maximum 50°C). Contact us for technical advice.
Precautions for scrapping of inverter
Burning of the electrolytic capacitors of the main circuit and printed circuit board may
result in explosion, and burning of plastic parts may generate toxic gases. Please dispose of
the controller as a kind of industrial waste.
