SRVO-134: DCLVAL / DCLVAL (PS) alarm (DC link voltage low)

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.

1. Momentary power interruption - plant-side blips.
2. Input voltage below rating or wrong transformer tap setting.
3. Robot and auxiliary axis accelerating simultaneously, sagging the bus.
4. Aux-axis timing quirk: a RESET input arriving simultaneously with an E-stop-type signal (SVOFF, fence open).
5. Hardware: E-stop unit, 6-axis amplifier, or αiPS.

How to fix it

1. Check for plant power events at the alarm time - an instantaneous dropout causes exactly this.
2. Verify input voltage against rating and confirm the transformer setting.
3. On aux-axis systems, stagger the program so robot and aux axis don't accelerate together.
4. Also on aux-axis systems: don't input RESET within 2 seconds of an emergency-stop-type signal - a documented cause.
5. Then hardware: E-stop unit, amplifier, power supply. Power-cycle to clear.

Related codes

• SRVO-133FSAL (PS) alarm (power supply fan stopped)
• SRVO-135FSAL alarm (aux amplifier fan stopped)
• SRVO-131LVAL / LVAL (PS) alarm (PS control voltage low)
• SRVO-130OHAL1 (PS) alarm (power supply overheat)
• SRVO-126Quick stop error
• SRVO-124Check HardStop if Hit
• SRVO-122Bad last ang (internal)
• SRVO-121Excessive acc/dec time