Description
Application Scenarios
At a paper-machine drive control room, the original DCU20 desk unit had been in service for more than 15 years. Its LCD contrast had faded, pushbuttons showed intermittent contact resistance, and the machine tender could no longer read speed and fault information reliably during grade changes.
The maintenance team replaced the unit with a DCU30/7 using the available conversion arrangement. Because the DCU30 retains the DCU20 connector pinout, the swap was a direct desk-cutout replacement without rewiring the MasterFieldbus node. The new 2×16 LCD and illuminated pushbuttons restored clear readout of drive speed, current and fault status, while the 4 DI / 3 DO and 0–10 V DC control interface kept the existing start, stop and reference logic intact. The machine tender reported that grade changes no longer required a second person at the VSD cubicle to confirm status.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | REP3ASU21C110 |
| Commercial Alias | DCU30/7 |
| Alternative Reference | PE1360 |
| Manufacturer | ABB |
| Country of Origin | Sweden (SE) |
| Product Category | Desk Control Unit / Communication Module |
| Compatible Systems | Advant OCS, Advant Controller 450 v2.3, Master software drive-control desks |
| Display | Backlit LCD, 2 lines × 16 characters |
| Operator Controls | 16 pushbuttons with indication |
| Digital Inputs | 4 |
| Digital Outputs | 3 |
| Analog Output / Control | 0–10 V DC |
| Communication | ABB MasterFieldbus; RS485 with Modbus RTU |
| Power Consumption | 12 W |
| Front Protection | IP65 operator side (dust-tight, low-pressure washdown resistant) |
| Rear / Mounting Side | Desk cutout / panel adapter (IP54 when mounted as specified) |
| Operating Temperature | -10 °C to +50 °C |
| Mounting | Desk cutout or panel adapter plate |
| Dimensions (W × H × D) | 178 mm × 110 mm × 204 mm |
| Weight | 3.3 kg |
| Customs Tariff Number | 8538 90 91 |
| Lifecycle Status | Discontinued new from ABB — available as original spare, refurbished or tested take-out |
Technical Principles and Innovative Values
Innovation Point 1 — Local HMI and bus node in one desk-mounted unit. The DCU30/7 is simultaneously an operator panel and a MasterFieldbus communication module. It converts start, stop and speed-reference commands at the desk into bus traffic and returns drive-speed, current and fault information to the same LCD, removing the need for a separate panel-mounted HMI.
Innovation Point 2 — RS485 Modbus RTU alongside proprietary MasterFieldbus. This dual communication capability lets the desk unit sit natively on ABB drive-control networks while still exchanging parameter data with Modbus-capable equipment, useful in mixed-vendor retrofit environments.
Innovation Point 3 — Conversion-friendly form factor. The DCU30 uses the same connector philosophy as the older DCU20 but in a smaller housing, so a conversion plate allows the DCU30/7 to drop into an existing desk cutout—preserving the desk layout operators already know.
Innovation Point 4 — Industrial front-of-panel environmental rating. With an IP65 front bezel, the unit resists dust and low-pressure washdown on the operator side, an important advantage in paper-machine basements and other wet industrial areas.
Innovation Point 5 — 0–10 V DC analogue command path. In addition to discrete I/O, the supports 0–10 V DC control, allowing smooth speed or setpoint commands without extra analogue interface hardware.
