• ・Max. 120Hz. In the low Hz range (low frequency), please use within the inverter's tolerance range.
• ・The 40W, 60W, and 90W models cannot be used at low frequencies or for continuous operation above 60Hz. Please consult us separately.
• ・The 0.75 kW to 5.5 kW IE3 motors can be operated at constant torque between 6 Hz to 60 Hz. For details, please refer to the section below on continuous inverter drive of IE3 motor.

Please refer to the diagram below for frequency and torque characteristics.

• ・At high speeds, torque decreases in inverse proportion to rotation speed because kW remains constant. Also, as rotation speed increases, motor noise, motor fan noise, reduction gear noise, vibration, etc. increase.
• At low speeds, the motor's operating efficiency and cooling effect decrease, resulting in a large temperature rise. Use the motor at a lower torque as shown in the diagram below.

• - The brake requires a specific power source (frequency, voltage), so the brake circuit must be operated separately. Standard products are shipped with the brake lead wires screwed to the motor lead wires, but remove the screws and connect them separately.
• -When braking, please keep the speed below 60Hz (1800 r/min). Braking at high speeds above 60Hz can cause mechanical damage, abnormal wear and heat generation in the lining, and other problems, so always operate at 60Hz or below.

• Single-phase motors cannot be driven by inverters because they use capacitors.
  In addition, explosion-proof motors cannot be used because they are outside the scope of the power supply (frequency and voltage) for which explosion-proof certification has been applied.

At low frequencies and above 60Hz, reduce the torque as shown in the diagram above.

• - When a 400V class motor is driven by an inverter, insulation breakdown may occur due to the effects of high voltage surges (microsurges) generated by inverter switching. Therefore, measures to prevent this (microsurge countermeasures) are required for the motor, and standard 400V class motors are equipped with microsurge countermeasures even if not instructed otherwise. However, if the level exceeds 1250V, please install a suppression filter or reactor on the inverter side.
• - Temperature rise, noise and vibration will be greater than when using commercial power.
• To protect the motor from overheating, set the electronic thermal to general-purpose motor characteristics or install a thermal relay between the inverter and motor.
• When using a base frequency of 50Hz, the output torque should be 0.8 times the value in the table above (0.1kW to 0.4kW only).

*With inverter motor

An inverter motor is available as an option for 0.1kW to 0.4kW models.

Note) Rated voltage [0.1kW to 0.4kW: 200V class = 200/220V 60Hz, 400V class = 400/440V 60Hz]

• - At 60 to 120 Hz, the characteristic range is constant horsepower, just like a standard motor, and output torque is limited, so care must be taken with the load torque.
• - When setting the input voltage from the inverter to the motor, set the inverter's base frequency and base voltage, and be sure to set the inverter's output voltage so that it matches the voltage and frequency on the nameplate. (For inverter motors, the base frequency must be 60Hz.) Also, avoid directly connecting an inverter motor without an inverter, as this will cause a dramatic increase in current value due to voltage fluctuations. (This does not apply to short-term operation such as test runs or emergencies.) This phenomenon is particularly noticeable at 50Hz.
• - The inverter base frequency must be 60Hz.
• ・If 100% torque is required at low frequency, use an inverter to apply torque boost as necessary. Avoid long periods of continuous operation with excessive torque boost applied, as this may cause overheating.
• ・The motor may resonate depending on the rotation speed and frequency. When operating continuously, change the inverter carrier frequency settings to avoid the resonant frequency.
• - When the load is light, such as during a test run, the current value may be large at low frequencies. This is due to the characteristics of the motor and is not abnormal. The current value can be reduced by changing the inverter settings (reducing torque boost, lowering the V/F ratio, torque vector control).
• To protect the motor from overheating, set the electronic thermal to inverter motor characteristics or install a thermal relay between the inverter and motor.
• If the brake is installed, please refer to the wiring diagram. Operating the brake at high speed (60Hz or higher) may cause mechanical damage or abnormal wear of the brake lining, so be sure to operate it at 60Hz or less.