Remote Technical Support for FANUC & SINUMERIK Faults

Most CNC faults are diagnosed with information, not with a soldering iron. An alarm number, a diagnosis value and one measurement at the right terminal will decide whether the machine needs a parameter change, a cable, or a board. That decision can usually be made without anyone getting on a plane — which is what this service is.

Remote technical support for FANUC and SINUMERIK controls, run by an engineer with 20 years of field commissioning and repair experience on CNC electrical systems, PMC ladder and servo drives. You keep your hands on the machine; I read the numbers with you and tell you where to put the probe next.

1. What remote support is genuinely good at

• Alarm interpretation and reverse lookup. From an alarm number to its meaning, its likely cause and the signal it depends on — including manufacturer or external alarms in the 1000–2999 range that the standard list does not cover.
• “No alarm, but the machine will not move.” The most common call. Diagnosis numbers narrow it to a waiting signal, an in-position check or an interlock within minutes.
• Recovering from a parameter or data mistake. What order to restore in, and what is lost if you restore the wrong thing.
• Servo vibration, overshoot and noise. Classify the phenomenon first — the adjustment direction for a high-frequency squeal is the opposite of the one for low-frequency flutter.
• PMC ladder logic changes. Reading the existing logic, tracing a signal to the I/O point, and specifying the change — including what to protect before you edit.
• Pre-delivery and used-machine checks. A structured electrical inspection before money changes hands.
• Training for a repair team. Walking your engineers through the same signal-chain method on their own machines.

2. What it cannot do

Being clear about this saves both of us a bad session.

• It cannot replace measurement. Somebody has to be at the machine with a meter. I can tell you which terminal and what to expect; I cannot read it for you.
• It cannot repair hardware. A blown amplifier, a damaged encoder or a burnt board needs the part in hand.
• It cannot override safety. Work on safety circuits, interlocks and guarding must be executed by qualified personnel on site, following the machine builder’s procedure.
• It cannot guarantee a one-call answer. When the information is thin, the honest answer is a measurement plan rather than a guess. You will get the plan, not a confident wrong diagnosis.

3. What to send before the session

The quality of a remote session is set before it starts. These five items cut the time roughly in half.

Table 1 — Pre-session checklist

4. How a session runs

1. Timeline. What the machine was doing, what changed, and what has been tried. Five minutes here often replaces an hour of guessing.
2. Locate the signal. From the alarm or symptom to a specific diagnosis number, PMC address or I/O point — the same signal-chain method used throughout the guides on this site.
3. Measure three to five points. You take the readings, in order, at terminals I specify, and report what the meter shows.
4. Decide and hand over. The outcome is one of three: fixable on site now, needs a part, or needs physical intervention. In all three cases you get the next-step list and the check that proves the fix.

A typical session runs 45 to 90 minutes. Complex ladder work or servo tuning is usually split into two sessions, because the second one needs data from the machine running.

5. For repair companies, integrators and dealers

A large part of this work is behind the scenes for companies that already sell service — the support is white-labelled, your customer sees your engineer.

• Overflow support. When a job is outside your team’s current depth, it does not have to be turned away.
• Standardising a machine fleet. Turning the recurring faults on your most common models into a checklist your engineers can run without calling anyone.
• Engineer training. PMC signal tracing and servo adjustment taught on your own machines, not on slides.
• Repair-or-replace calls. A second opinion on whether an amplifier or motor is worth repairing before you quote the customer.
• Pre-delivery inspection. An electrical check sheet for used machines, so the surprises happen before delivery rather than after.

Engagement is per case or by monthly arrangement, depending on volume. Tell me the machine mix and roughly how many calls a month, and we can size it.

6. Languages, time zone and response

Sessions run in Chinese or English. I am in GMT+8, which covers the working day across East and Southeast Asia and overlaps the European morning. Messages are answered within 24 hours; a machine-down situation is prioritised, so say so in the first line.

7. How to start

Send the alarm number and the machine model. That alone is usually enough to tell you whether this is a ten-minute fix, a part to order, or a job for someone on site.

8. Where to go next

• FANUC troubleshooting library — 48 field guides on alarms, servo, spindle, PMC and electrical faults. Many calls are solved by reading the right one first.
• CNC repair tools — which instrument measures what, and the specification that actually matters, so the readings you send me are trustworthy.

9. Questions before you book a session

Scope note: remote support covers diagnosis, parameter and logic advice, and technical cooperation. It does not replace on-site statutory safety work, and any procedure involving safety functions must be carried out by qualified personnel following the machine builder’s instructions.