FANUC Alarm SRVO-148 — SERVO HCAL(CNV) alarm
Manufacturer wording — SERVO HCAL(CNV) alarm (G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-148 (“SERVO HCAL(CNV) alarm”): The current in the main power circuit of the servo amplifier exceeded specification. First check: Disconnect the motor power wires from the servo amplifier and turn on power. Likely part: Servo amplifier (Servo amplifier).
Updated 2026-09-17 · LogrobotLM reference
Description
The current in the main power circuit of the servo amplifier exceeded specification.
Remedy
Disconnect the motor power wires from the servo amplifier and turn on power. If an HCAL occurs, replace the transistor module or servo amplifier. Measure the resistance between GND and U, V, W individually on the cable terminals. If shorted, determine if the cable or motor is bad. Check the resistance between U-V, V-W, and W-U using a measuring instrument sensitive enough to detect small resistances at the cable terminations. If the resistances are the same, replace the servo amplifier. If the resistances are different, determine if the cable or motor is bad. If the problem persists, replace the SIF module on the axis control for the defective axis.
Part to check / replace
FANUC SRVO-148 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 →