SRVO-134: DCLVAL / DCLVAL (PS) alarm (DC link voltage low)
The DC bus voltage feeding the 6-axis amplifier is abnormally LOW - the inverse of SRVO-044's overvoltage.
What it means
The DC bus voltage feeding the 6-axis amplifier is abnormally LOW - the inverse of SRVO-044's overvoltage. The interesting causes are upstream: momentary power dips, undersized supply during simultaneous acceleration, and a documented reset-timing quirk on auxiliary-axis systems.
Common causes
Ranked by what technicians most often find, most likely first.
- Momentary power interruption - plant-side blips.
- Input voltage below rating or wrong transformer tap setting.
- Robot and auxiliary axis accelerating simultaneously, sagging the bus.
- Aux-axis timing quirk: a RESET input arriving simultaneously with an E-stop-type signal (SVOFF, fence open).
- Hardware: E-stop unit, 6-axis amplifier, or αiPS.
How to fix it
- Check for plant power events at the alarm time - an instantaneous dropout causes exactly this.
- Verify input voltage against rating and confirm the transformer setting.
- On aux-axis systems, stagger the program so robot and aux axis don't accelerate together.
- Also on aux-axis systems: don't input RESET within 2 seconds of an emergency-stop-type signal - a documented cause.
- Then hardware: E-stop unit, amplifier, power supply. Power-cycle to clear.