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Using an encoder on site is recommended when the motor load fluctuates greatly. In CLVC close-loop vector control mode, the Hopewind frequency converter controls the motor stability by adjusting excitation, speed loop and current loop.

How does your frequency converter handle the problem of motor shaft lock when starting at a low speed without a code disk?

In the non-code disk mode, the Hopewind frequency converter can enable the low-speed open-loop mode and set the appropriate low-speed open-loop current according to the load. When starting at a low speed, it will output the set large torque to make the motor speed reach the set value before switching to the speed mode, to avoid the problem of motor shaft lock in the non-code disk speed mode at a low speed.

How does your drive converter handle the problem input and output voltage and current harmonics?

We may connect a suitable reactor in Series at the input or output end of the drive converter, or install a harmonic filter. The harmonic filter adopts the LC type, which can absorb harmonics and increase the power supply or load impedance to inhibit the harmonics.

Do you have to identify the motor parameters when your frequency converter controls the motor operation?

In VF control mode, the frequency converter I1-56.12VF curve-frequency reference value and I1-56.12VF curve-voltage reference value must be consistent with the motor nameplate parameter settings. Therefore, the motor can be started without the identification of motor parameters; In OLVC open-loop vector mode, the motor can be only started under the premise of identifying the motor parameters; In CLVC close-loop vector control mode, the motor can be only started under the premise of identifying the motor parameters and calibrating the code disk speed detection value to be consistent with the motor speed.

When the motor direction is reversed, or the code disk speed is reversed, how to obtain the reversed by modifying the frequency converter parameters without rewinding?

The direction of the motor can be switched by setting the direction switching bit source of the frequency converter parameter I1-26.31: 0 - not switch; 1 - switch. The direction of the code disk can be set by selecting its direction of the frequency converter parameter I1-47.04: 0-A - ahead of B; 1-B - ahead of A.

Can your HD2000 Series HCU20 Controller form a multi-machine parallel?

Hopewind HD2000 Series can realize one-master-one-slave applications by adopting PTP point-to-point communication between HCU20 controllers, or realize one-master-five-slave applications by adopting Ethernet to form master-slave communication.

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