SRVO-105: Door open or E.Stop

What it means

The controller door is open, or an emergency-stop signal blinked on briefly - too briefly to latch its own specific alarm. When nobody touched a door or a button, this alarm is famous for pointing at intermittent E-stop circuit trouble: a loose wire, a flaky contact, a switch on its way out.

Common causes

Ranked by what technicians most often find, most likely first.

1. Controller cabinet door genuinely open.
2. Momentary E-stop signal: intermittent wiring, a marginal contact in any E-stop device, or vibration rattling a connection.
3. Another alarm in the history is the real event - check what fired with it.

How to fix it

1. Check the alarm history first; if other alarms accompanied it, work those.
2. Close the controller door and press RESET.
3. For repeat offenders with no obvious cause, inspect the E-stop chain for intermittents - wiggle-test connectors and devices; these ghost trips are almost always a connection working loose.
4. Deeper circuit diagnosis per the maintenance manual, qualified personnel only.

Related codes

• SRVO-079Stroke exceeded during press
• SRVO-078Servo param update
• SRVO-076Tip Stick Detection
• SRVO-074LDAL alarm (pulse coder LED broken)
• SRVO-073CMAL alarm (pulse coder noise/fault)
• SRVO-072PMAL alarm (pulse coder fault)
• SRVO-071SPHAL alarm (feedback speed excess)
• SRVO-070STBERR alarm (pulse coder framing error)