Most operators who have transitioned from contactor-controlled cranes to a new variable frequency drive system will tell you that there is an adjustment period. Overall, it can take weeks to even a few months to get used to the new operating characteristics of the crane.
On a contactor system, the operator is used to letting off of a button and the crane stops within a few feet. With a VFD, the crane may continue to travel another 5-10 feet after the operator lets off of the button. This is caused by deceleration time that’s built in to prevent torque on the drivetrain components and prevent load sway.
Luckily, variable frequency drives provide the user with every opportunity to operate the crane safely, improve performance, and reduce maintenance and wear. After the system has been installed, a technician can fine-tune the controls based on the operator’s preferences to try and get a similar feel to their old style controls, but still prevent excessive torque and abuse of the drivetrain.
The installers or service techs can also provide training to in-house maintenance personnel on how to use the keypads to adjust or program the parameters of the drives and also train them on how to interpret and diagnose problems with the equipment using fault codes.
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