In this guide
When a drive or controller fails, the pressure is to restart the line. The fastest option is not always the cheapest over the next five years, so check three things before you decide.
1. Is a like-for-like part available?
If an identical replacement can be sourced, fitting it is usually the quickest way to restart. If the product is discontinued, a replacement may still exist as surplus or refurbished stock, but supply is limited and the same problem will return when the next one fails.
2. Did the part fail, or did something cause it to fail?
Drives that trip repeatedly, modules that fail soon after being replaced and intermittent faults often point to something else: supply quality, cooling, wiring, moisture or a failing load. Replacing the visible part without finding the cause tends to bring the same failure back.
3. What is the plan for this equipment?
If the machine has years of life left and the platform is still supported, a like-for-like replacement is sensible. If the platform is near the end of its life and other parts are ageing too, a staged upgrade can cost less over time than a string of emergency replacements.
A quick decision guide
| Situation | Usually best |
|---|---|
| Line is down and a like-for-like part is available | Replace, then investigate the cause |
| The same fault keeps coming back | Fault find before buying anything else |
| Part is discontinued but a supported successor exists | Plan the changeover, and buy a spare of the old part as a bridge |
| Platform is obsolete and several parts are ageing | Plan a staged upgrade and hold critical spares in the meantime |
Before you order
- Record the full order number and version from the label
- Photograph the label and the wiring before removing anything
- Back up the program or drive parameters if the old unit still powers up
- Note supply voltage, motor data and any communication settings
If you are not sure which of these fits, describe the fault and the equipment. An engineer can help you decide before you place an order.