LogrobotLM

LogrobotLM — AI fault diagnosis for ABB · KUKA · FANUC robots. It reads your robot backup in your browser (never uploaded) and pinpoints the fault. Try it free → · Le diagnostic IA qui lit la sauvegarde de votre robot, sans rien téléverser.

FANUC Alarm SRVO-138 — SERVO SDAL alarm (G:%d A:%d)

FANUC SRVO-138 (“SERVO SDAL alarm (G:%d A:%d)”): The feedback data from pulse coder was abnormal by: 1. First check: 1. If the alarm disappeared by power off/on, please make sure the cable shields are properly grounded. Likely part: Pulsecoder (Pulsecoder (motor encoder)).

Updated 2026-08-29 · LogrobotLM reference

Description

The feedback data from pulse coder was abnormal by: 1. Noise on the pulse coder. 2. The interpolation circuits of the pulse coder are broken.

Remedy · Remède

1. If the alarm disappeared by power off/on, please make sure the cable shields are properly grounded. 2. If this problem occurs repeatedly, replace the pulse coder and master the robot..

Part to check / replace · Pièce à contrôler / remplacer

FANUC SRVO-138 points to the hardware below — start here before ordering. · SRVO-138 met en cause l'organe ci-dessous : commencez par là.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering. · Touchez une pièce pour tous les codes qui la citent ; vérifiez la variante exacte avant commande.

Frequently asked · Questions fréquentes

What does FANUC alarm SRVO-138 mean?
FANUC SRVO-138 (“SERVO SDAL alarm (G:%d A:%d)”): The feedback data from pulse coder was abnormal by: 1. Noise on the pulse coder. 2. The interpolation circuits of the pulse coder are broken.
How do you troubleshoot FANUC alarm SRVO-138?
1. If the alarm disappeared by power off/on, please make sure the cable shields are properly grounded. 2. If this problem occurs repeatedly, replace the pulse coder and master the robot..
Which part is involved in FANUC SRVO-138?
SRVO-138 points to Pulsecoder (Pulsecoder (motor encoder)). Confirm the real cause against the robot backup before replacing a part.

Related codes / Codes liés

SRVO-136SERVO DCLVAL alarm (G:%d A:%d)SRVO-137SERVO DAL alarm (G:%d A:%d)SRVO-141SERVO OHAL1(CNV) alarm (G:%d A:%d)SRVO-142SERVO OHAL1(INV) alarm (G:%d A:%d)

Same hardware involved / Même matériel en cause

SRVO-038PulsecoderSRVO-061PulsecoderSRVO-063PulsecoderSRVO-064Pulsecoder

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. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →