Equipment, Controls & Power
Motor circuits, starters & VFD electrical
Motor controls, VFDs and industrial electrical controls in Richardson and North Dallas — three-phase motor circuits, starters, contactors, VFD wiring and control troubleshooting.
Motors run the parts of a commercial or industrial building that make money — pumps, compressors, conveyors, packaging and production machinery. When a motor won't start or a drive trips every cycle, the problem is electrical until proven otherwise, and it needs to be diagnosed as a system: the branch circuit, the starter or drive, the control wiring and the motor itself.
We install, replace and troubleshoot motor circuits, starters, VFDs and industrial control wiring to the manufacturer's installation drawings and wiring methods. The scope boundary is stated up front: proprietary drive programming, process-control logic and advanced commissioning belong to the manufacturer or a qualified controls specialist. We provide and coordinate the electrical installation and diagnosis, working directly with your integrator or factory technician.
Motor branch circuits, feeders and VFDs
A three-phase motor circuit is more than a breaker and a wire: conductors and overcurrent protection are sized from the nameplate, and the starting method — across-the-line, soft start or drive — decides what protection and control the circuit needs. Across-the-line installations include the starter or contactor, overload relay, control transformer and pilot devices; everything is installed for the environment it lives in.
VFDs have wiring requirements that differ from ordinary motor circuits and the manufacturer's instructions govern — line-side and load-side conductors, grounding provisions, and shielded cable or power/control separation where required. We troubleshoot the electrical side of drive problems (power quality, phase loss, damaged conductors, control-wiring faults); when a fault points into programming, that work goes to the manufacturer or your controls specialist after we've verified the wiring feeding the drive.
- Three-phase motor branch circuits and feeders
- Starters, contactors, overload relays and control transformers
- VFD installation and replacement to manufacturer methods
- Line-side/load-side wiring, grounding and disconnects
- Incoming power, phase balance and load-side fault checks
Control power, interlocks and diagnosis
Industrial equipment often runs on a chain of conditions — permissives, interlocks between machines, remote enable signals and safety interfaces — wired exactly as the manufacturer's drawings show. We terminate that wiring and coordinate the handoff points with the controls integrator's panel, but we don't redesign proprietary control schemes or write process logic; disagreements between drawings and equipment get documented and sent back to the manufacturer.
Common symptoms — a motor that won't start, chattering starters, nuisance trips, a pump running backward after service, phase loss — get diagnosed by measuring through the chain: supply voltage and phase balance, current on all three legs, overload settings against the nameplate, and control voltage through the interlock chain.
- Control power, permissives and equipment interlocks
- Safety interfaces wired to approved drawings
- No-start and intermittent-fault diagnosis
- Phase loss and voltage imbalance tracing
- Incorrect rotation correction after service work
Startup support and honest boundaries
Before energizing we verify phase rotation, confirm voltage and current under load, and check control and interlock functions against the drawings. During manufacturer startup we support the electrical side while parameter verification stays with the specialist responsible for the equipment.
The boundaries, stated plainly: we do not provide PLC programming, proprietary controls redesign, process-control engineering or manufacturer-certified commissioning. Those stay with the manufacturer or your controls professional, and we coordinate so the electrical side is never the reason a startup slips.
- Phase rotation verification before energizing
- Voltage and current checks under load
- Support during manufacturer startup and commissioning
- Documentation: readings, labeling and updated schedules
What this typically includes
- Three-phase motor branch circuits and feeders
- Starters, contactors and overload relays
- VFD installation and replacement to manufacturer wiring methods
- Disconnects and overcurrent protection for motors and drives
- Control power, permissives, interlocks and remote start/stop
- Diagnosis of trips, phase loss, rotation and control faults
- Startup support with the manufacturer or controls specialist
- Labeling, readings and documentation for the facility team
Related services
Flip the Switch Electric serves Richardson, TX and the surrounding North Dallas area. Tell us what you're working on and we'll give you a straight answer on scope and fit.
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