Allen-Bradley 1391-DES45-D1 servo drive

The Allen‑Bradley 1391‑DES45‑D1 is a digital AC servo drive rated for 45 A, 210 V, 3‑phase operation with an integrated LCD and keypad. Common failure points for this class include overheating of the power MOSFETs or IGBTs, insulation breakdown in the output windings, and degradation of the internal control firmware due to thermal cycling. Initial diagnostics should verify that the isolation transformer is supplying clean 230 V AC at the correct phase balance, inspect all input/output terminals for corrosion or loose connections, and review any fault codes displayed on the unit’s LCD before proceeding with component replacement.[oss-gpt-20b]

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