Fagor alarm 6049: Amplitude alarm

What it means

The peak-to-peak amplitude of the sinusoidal signals at the local feedback drifted outside the allowed window (roughly below 0.4 Vpp or above 1.45 Vpp). Amplitude excursions degrade interpolation quality long before total signal loss, so the loop monitors them continuously.

Likely causes

• reading head gap wrong after scale remounting
• contaminated scale graduations attenuating signal
• cable length/impedance change altering levels
• failing LED or preamplifier in the head

Replacement parts

We supply the following units for this alarm — tested, warranty-backed:

• SV-C / S2 linear scale reading head

  scale · Common cause

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