ADT frequency inverter for Crane beam control

I Crane beam introduction

Crane beam is an indoor lifting equipment widely used in workshop and warehouse. Normally a crane beam is driven by 4 motors. 2 motors drive the crane beam forward and backward; one motor is responsible for left and right moving, and the other one motor is for lifting the objects up and down.

The crane beam without VFDs starts, stops, runs forward and backward via contactors. But the starting current is very high. And the equipment is often in working status with impact, large vibration, and high noise. This greatly shorten the service life and need regular replacing the contactors. Furthermore, the lifting position is not very precise.

Using variable frequency drives to control the crane beam has advantages such as main circuit contact-less control, step-less speed regulation, small starting current, no impact, no vibration, low noise, and more important the lifting precision is much higher and production efficiency is higher and maintenance fee is reduced. The frequency inverter itself has complete protections for over-current, over-load, over-voltage etc. In case of these type of error, the inverter can trip off and stop the crane, reducing the crane working faults and improving the crane’s safety performance.

II Crane beam control system configurations

1. One set of AD300 open-loop vector control AC drives controls the forward and backward motors. The 2 motors have same specifications and the inverter power is the sum of 2 motors’ power. Brake unit is inbuilt. External braking resistors should be selected according to the motor power.

2. One set of AD300 open-loop vector control VFD control the motor for left and right moving. The inverter power is the same as the motor power. Brake unit is inbuilt and the resistors should be chosen according to the motor power.

3. One set of AD300 sensor-less vector control inverter controls the lifting motor. The inverter power is suggested to be 2 grades higher than the power of the motor. The brake unit and brake resistors should be chosen according to the motor power.

Forward and backward motor inverter parameter setting

Forward and backward motor inverter wiring:

Lifting motor inverter wiring: