FANUC Alarm SRVO-157 — SERVO CHGAL alarm
Error- Hardware
- servo amplifier
- Controllers
- R-J3iB / R-30iA / R-30iB
- FANUC class
- SERVO
Manufacturer wording — SERVO CHGAL alarm (G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-157 (“SERVO CHGAL alarm”): Charging of the main circuit could not finish within the specified time. First check: The DC link might a short-circuit. Likely part: Wiring board (Wiring board).
Updated 2026-10-22 · LogrobotLM reference
Description
Charging of the main circuit could not finish within the specified time.
Remedy
The DC link might a short-circuit. Check the connections. Electric resistance to restrict charge current might be defective. Replace the wiring board. Refer to the maintenance manual for details.
Field diagnosis
The DC bus capacitors did not reach their voltage within the allotted time when power was applied.
What to check
- Check the input voltage; check the connector between the amplifier and the emergency stop board (CRRA12 on R-30iB); emergency stop unit, then amplifier, then auxiliary axis amplifier if applicable.
- Note: A main contactor with pitted contacts gives CHGAL one start in three.
Part to check / replace
FANUC SRVO-157 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 →