FANUC Alarm SRVO-134 — SERVO DCLVAL(PSM) alarm
Error- Hardware
- servo amplifier
- Controllers
- R-J3iB / R-30iA / R-30iB
- FANUC class
- SERVO
Manufacturer wording — SERVO DCLVAL(PSM) alarm (G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-134 (“SERVO DCLVAL(PSM) alarm”): The back-up charge circuit for the amplifier has trouble. First check: Check the cables and connections between the amplifier (CN1) and the MCC. Likely part: E-stop unit (E-stop unit).
Updated 2026-10-22 · LogrobotLM reference
Description
The back-up charge circuit for the amplifier has trouble.
Remedy
Check the cables and connections between the amplifier (CN1) and the MCC. Check the fuse (F1,F3) in the transformer. If using a B-cabinet, replace the EMG control printed circuit board.
Field diagnosis
The DC voltage of the power supply module main circuit is too low: mains micro-outage, missing phase or weak supply network.
What to check
- Look for a micro-outage in the workshop logs, measure each phase at the module input, check the transformer tap.
- On R-30iB, lighten the program if the code only appears at high accelerations.
- Note: A lost phase gives DCLVAL with the robot moving and nothing at standstill.
Part to check / replace
FANUC SRVO-134 points to the hardware below — start here before ordering.
Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.
Related codes
Same hardware involved
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. How this reference is built →