User Guide

Selection of motor and Clean Power VFD should be performed by skilled and experienced personnel.

This guide is a supplement, not a replacement for such expertise.

Before selecting a Clean Power VFD and a motor, it is necessary to know the operating environment and the work to be performed.

First, the user must select the proper motor according to the load's driving force and the movement cycles.

The basic movement cycle is: start > acceleration > constant speed > deceleration > stop.

Second, the user must select the Clean Power VFD accordingly to its capacity to drive the motor previously selected.

The motor torque must be larger than the load start torque.

The motor torque must be larger than the load torque required for acceleration:

Motor torque > Load torque + Acceleration torque.

Acceleration torque = (total inertia of the system * (target speed - starting speed) )/ (9.55 * acceleration time)

During deceleration, a motor acts as a generator and the energy flows back into the Clean Power VFD.

The deceleration capability is determined by the Clean Power VFD's capability to consume or regenerate this energy.

If the energy regenerated by the motor is higher than the Clean Power VFD ability to handle it, then some alarms may be triggered and the Clean Power VFD may turn into a "self-protective" lock state.

During deceleration, a motor acts as a generator and the energy flows back into the Clean Power VFD.

The deceleration capability is determined by the Clean Power VFD's capability to consume or regenerate this energy.

If the energy regenerated by the motor is higher than the Clean Power VFD ability to handle it, then some alarms may be triggered and the Clean Power VFD may turn into a "self-protective" lock state.

The user must ensure that deceleration time is correctly set.

Check the motor temperature rise specification is compatible with both the movement cycles and operating environment.

During acceleration or constant speed operation the Clean Power VFD's capacity is limited by the peak current it can deliver to the motor.

The user must ensure that the rated current output and overload capacity are the correct size for the application.

Clean Power VFD current ratings are given as for Normal duty operation and Heavy-duty operation. They are RMS values.

In variable torque applications, a normal duty drive is well suited. For these applications in which the torque drops along with the speed, a high overload tolerance is not required.

In constant torque applications, the Clean Power VFD must be chosen according to its heavy-duty capacity. These applications require a high overload tolerance with constant load torque,

- In normal-duty operation, the overload capacity is 110% during 60s every 10 min @ 40 °C.

- In heavy-duty operation,the overload capacity is 150% during 60s every 10 min @ 40 °C.

While it is possible to drive multiple motors with a single Clean Power VFD, some additional precautions are required.

First select a Clean Power VFD with a rated output current greater than the combined total of the individual motor currents.

Please note: Depending on the specifics of the application, driving multiple motors may not be the most economically efficient solution because the capacity of the Clean Power VFD may become very large.

V/F control must be selected to drive multiple motors with one Clean Power VFD.

Define the Clean Power VFD current rating upon the number of driven motors:

- One motor is driven with one Clean Power VFD. Then rated output current of Clean Power VFD > rated current of the motor.

- Multiple motors are driven with one Clean Power VFD. Then rated output current of Clean Power VFD >total of rated motor current

- If several motors are sequentially started with one Clean Power VFD. Then rated output current of Clean Power VFD >Total rated current of the started motors +Starting current for the largest-capacity motor

Please note: When multiple motors are operated in parallel, the motors cannot be protected by the built-in electronic thermal relay function.

User must add a thermal relay for each motor on the Clean Power VFD output side.

For a continuous drive at low speed, install a temperature detection device on the motors since the motors cannot be protected by the Clean Power VFD thermal function.