Technical Specifications Model: NDCU‑21C Compatible System: ABB ACS600 Multidrive System Power Supply: Internal power obtained from multidrive cabinet auxiliary power supply Communication Interface: DDCS optical fiber ports Control Mode: Speed closed‑loop, torque closed‑loop control Mounting Method: Internal plug‑in installation inside multidrive inverter unit Operating Temperature: 0 ℃ to +60 ℃ Storage Temperature: ‑40 ℃ to +85 ℃ Relative Humidity: 5‑95 %, non‑condensing Protection Class: IP20 Certifications: CE
Functional Features Realizes independent motor closed‑loop control for single inverter unit of ACS600 multidrive cabinet. DDCS optical fiber interface communicates with system main control board and other option modules. Receives voltage, current and temperature sampling signal of inverter power unit. Generates PWM drive signal for inverter power semiconductor components. Complete over‑current, over‑voltage, over‑temperature and short‑circuit protection logic. Stores fault event code and realizes fault status upload via DDCS bus. Supports parameter setting and diagnosis via drive control panel tool.
Application Scenarios Spare‑part replacement for NDCU‑21C control unit inside ABB ACS600 multidrive inverter unit. Multi‑motor variable‑speed control system maintenance for metallurgy, paper‑making and chemical industry. Repair and hardware renewal of legacy ACS600 multidrive cabinet.
Installation Requirements Cut off multidrive cabinet total power supply, fully discharge DC‑bus residual voltage before replacement operation. Insert NDCU‑21C into designated slot of inverter unit, fasten fixing screws. Connect DDCS optical fiber jumpers and power‑unit signal harness according to signal definition. Check back‑plane connector complete insertion status. Complete motor parameter configuration and motor identification after power‑on. Verify inverter unit running and protection function.
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