Precision Electric Manuals & User Guides

Precision Electric Industrial Solutions

Precision Electric, Inc. is a leading provider of industrial motor and drive solutions. Trusted since 1983, the company specializes in the sale and repair of electric motors, Variable Frequency Drives (VFDs), phase converters, and other critical industrial electronics.

They support a wide range of commercial applications, from manufacturing conveyor systems to massive HVAC installations. Precision Electric's extensive expertise covers everything from replacing blown DC bus capacitors and power semiconductors in VFDs to full rewind and reconditioning of three-phase AC induction motors. By offering rapid turnarounds, diagnostic technical support, and precision component machining, Precision Electric acts as an essential partner in preventing unplanned downtime for industrial operations.

• Why does my Variable Frequency Drive (VFD) trip GFCI breakers?

  VFDs can trip GFCIs due to high-frequency leakage currents from the fast PWM output. High-quality drives include EMI filters that intentionally leak a small AC current to ground, confusing sensitive standard GFCIs. Ensure motor insulation meets requirements and use suitably rated GFCI protection.

• What causes overvoltage faults during VFD deceleration?

  When decelerating a high-inertia load too quickly, the motor acts as a generator and feeds energy back into the VFD's DC link capacitors. To prevent tripping, you can extend the deceleration time or install a braking chopper with a resistor to dissipate the excess energy.

• Should I repair or replace my industrial electric motor?

  A standard industry guideline is the 'half to three-quarter rule': if repair costs approach 50-75% of a new high-efficiency motor's price, replacement might be best. However, large, custom, or long-lead-time motors are often ideal candidates for repair by certified shops like Precision Electric.

• What are the signs of VFD hardware failure?

  Common VFD hardware failures include blown DC bus capacitors (swollen or vented), shorted IGBT modules (triggering immediate ground faults), or dead cooling fans (causing overheat trips). Proper surge protection and routine inspections help prevent catastrophic failure.