SRVO-047: LVAL alarm (low control voltage)
The low-voltage control supply (+5V etc.) inside the servo amplifier dropped below spec - the amplifier's own electronics aren't being fed properly.
What it means
The low-voltage control supply (+5V etc.) inside the servo amplifier dropped below spec - the amplifier's own electronics aren't being fed properly. Posts per amplifier; power-cycle to clear.
Common causes
Ranked by what technicians most often find, most likely first.
- Power supply unit fault.
- Servo amplifier fault.
- Wiring between PSU and amplifier.
How to fix it
- Cycle power once - transient supply dips happen.
- On recurrence, this is a PSU/amplifier diagnosis per the controller maintenance manual: check the amplifier's control-voltage LEDs and the PSU outputs before swapping parts.