Parker 690 Series VFD Repair & Supply Services

Safe Torque Off board failure. We have fixed many of these — fast turnaround and 100% confidence in restoration.

This is a power section internal fault — very common on Parker 690/890. We repair the issue directly at component level.

Often caused by high inertia loads, faulty brake resistors, or too high input voltage.

Caused by missing phases, bad supply, or internal damage.

Too fast accel/decel, shock loads, short circuits, or bad IGBT — we handle all of them.

Poor ventilation or cooling — fully repairable with fan and thermal path testing.

Can be from load, low boost setting, or bad configuration.

High inertia deceleration too often — we can repair & test the full brake circuit.

Internal switch overload or configuration issue.

Timeout or communication board failure — component-level repair available.

Bad link between control and power board — firmware issues fixable.

Encoder card or wiring issues — we test and repair encoder signal paths.

Triggered by overload or shock load — verified with dynamic tests.

Common from shorted external controls or damaged onboard power supply.

Missing phase or internal fault — we validate supply and drive response.

Often a bad input phase or damaged capacitor — fully testable in-house.

Overcurrent on the braking path — we bench test all paths post-repair.

Feedback signal gone rogue — usually encoder card or loop setting error.

Wrong range, wiring issues, or short circuit on external signal wiring.

Boost levels set too high or stuck motor — fully resolvable.

Bad cooling, bad thermistor, or improper VFD settings — we’ve seen and fixed them all.