Compactor Motor Driver Controls — VFDs, Contactors, Soft Starters

What this page covers

Motor driver controls sit between the compactor's control logic and the hydraulic pump motor. They handle the heavy electrical work — switching motor current, soft-starting to avoid in-rush current spikes, and protecting the motor from over-current and phase-loss conditions. When a motor driver fails, the compactor either won't run or runs unsafely.

PRT stocks contactors, soft starters, and VFDs in the ratings used across commercial and industrial compactors — from 5HP single-phase to 25HP three-phase. Motor protection relays and overload blocks are also stocked as repair items.

How to choose

Match by motor horsepower, voltage (single phase 110/220V or three phase 208/230/480V), and driver type (contactor, soft starter, or VFD). For VFDs, also confirm the input frequency (50/60 Hz) and any communication-protocol requirements (Modbus, Ethernet/IP).

If you're upgrading from a basic contactor to a soft starter or VFD, the benefit is reduced motor wear, lower in-rush current (which means smaller electrical service), and gentler hydraulic startup. Most operators recoup the upgrade cost in 2-4 years through reduced motor replacements.

Driver control types

• Motor contactorsStandard on/off motor switching. The most common driver for compactor motors.
• Soft startersRamp motor voltage up gradually to reduce in-rush current and mechanical shock.
• Variable frequency drives (VFDs)Full speed control — useful for variable-throughput compactor applications.
• Motor protection relaysOver-current, phase-loss, and thermal protection for compactor motors.
• Overload blocksThermal overload protection that mounts on the motor contactor.
• Replacement componentsIndividual contact blocks, coils, and auxiliary contacts for existing drivers.