FANUC Alarm SRVO-136 — SERVO DCLVAL alarm
Error- Hardware
- servo amplifier
- Controllers
- R-J3iB / R-30iA
- FANUC class
- SERVO
Manufacturer wording — SERVO DCLVAL alarm (G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-136 (“SERVO DCLVAL 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: Servo amplifier (Servo amplifier) +1 more.
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. Replace the amplifier.
Field diagnosis
The amplifier DC bus voltage is abnormally low during motion.
What to check
- Check the voltage and the presence of all three phases, the transformer tap, micro-outages; then emergency stop unit (contactor), then amplifier.
- Note: Read together with SRVO-134 (PSM) and SRVO-157 (capacitor charging).
Part to check / replace
FANUC SRVO-136 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 →