Okuma D11-A Drive

The Okuma D11‑A is a VACIII‑type spindle drive used in OSP700/7000 and OSP5020 CNC controls; it contains six EVM31‑050A transistor modules (150 A/600 V), three 110L2G43 diode modules (110 A/800 V), and a 200 V cooling fan. Common failure modes for this unit include burned or overheated transistors, cracked or shorted diodes, fan motor failure or bearing wear, and power supply voltage drops that trigger over‑current protection. First‑check diagnostics: verify the drive’s input voltage and monitor the PSU output; visually inspect the transistor and diode modules for discoloration or arcing; confirm the cooling fan spins freely and at correct speed; then review any diagnostic error codes displayed on the drive panel.[oss-gpt-20b]

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