Description
BEMAC UGS‑21 Automatic Generator Control Unit for Marine Power Management & Multi‑Genset Parallel Operation
Product Introduction
The BEMAC UGS‑21, manufactured by BEMAC (formerly Uzushio Electric, Japan), is a mature panel‑mount automatic generator controller dedicated to marine power plants and offshore platform power systems. This integrated controller executes full‑cycle genset automation: engine start/stop, generator synchronisation, breaker closing, active/reactive load sharing and comprehensive generator electrical & engine protection. Equipped with a built‑in synchroscope display, operators can visually check phase alignment for manual synchronisation while the unit performs auto‑synchronisation for unattended parallel operation. It communicates with other UGS‑21 controllers and the vessel’s main PMS system to realise multi‑generator power dispatch, load shedding and backup generator auto start upon mains failure. Widely deployed on cargo ships, offshore supply vessels and drilling platforms, UGS‑21 is a high‑demand spare part for marine electrical overhaul and emergency replacement of aging switchboard control panels.
Specific Application Information
- Multi‑generator parallel synchronisation: Auto synchronise diesel generators onto the ship main busbar with phase, frequency and voltage matching.
- Active & reactive load sharing: Automatically distribute real and reactive power evenly among parallel‑running gensets.
- Genset auto start‑stop: Trigger backup generator startup when bus load exceeds threshold or main generator trips; shut down standby unit after power restoration.
- Engine & generator protection: Implement over/under voltage, over/under frequency, reverse power, overload, overcurrent, oil pressure low and coolant high temperature protection.
- Load shedding management: Disconnect non‑essential loads sequentially during generator overload to protect critical marine loads.
- Breaker control: Local and remote close/trip command for generator circuit breaker with breaker status feedback monitoring.
- Parameter measurement & alarm: Real‑time display of voltage, current, power, frequency, engine speed; audible & visual alarm output for all fault conditions.
- Vessel PMS integration: Exchange operating data and interlock signals with the ship central power management system.
UGS-21
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | UGS‑21 |
| Manufacturer | BEMAC (Uzushio Electric, Japan) |
| Application | Marine diesel generator control & parallel operation |
| Rated AC Sensing Input | AC 110V, 5A, 50 / 60Hz |
| Auxiliary Supply | DC 18 ~ 32V (typical 24VDC marine power) |
| Mounting | Panel flush mounting inside main switchboard |
| Built‑in Display | Synchroscope + digital parameter LCD, LED status indicators |
| I/O Interface | Multi‑channel binary input, relay output for breaker & alarm |
| Communication | RS‑485 / CAN bus for PMS interconnection |
| Operating Temperature | -10°C ~ +50°C (marine control room environment) |
| Weight | Approx. 1.2 kg |
| Marine Certification | Complies with major marine classification society requirements |
Main Features
✅ All‑in‑one genset controller: Combines synchroniser, load sharing regulator, protection relay and measurement instrument into one single unit. ✅ Built‑in synchroscope: Visual phase indicator for operator manual synchronisation verification. ✅ Precise active & reactive load distribution: Stable parallel running for multiple marine generators without power hunting. ✅ Complete generator & engine protection suite: Reverse‑power trip, overload protection and engine abnormal parameter shutdown logic. ✅ Auto backup generator management: Automatic standby genset startup on busbar power loss or main unit failure. ✅ Load shedding function: Priority‑based non‑essential load tripping to prevent generator overload. ✅ Marine‑grade rugged hardware: Anti‑vibration design for continuous 24/7 operation on vessels and offshore installations. ✅ Local & remote dual control: Front panel manual operation and remote command from ship PMS system.
Application Scenarios
- Ocean‑Going Cargo Vessels: Main switchboard multi‑diesel generator parallel control.
- Offshore Supply Vessels (OSV): Offshore platform vessel power management and genset automation.
- Drilling Rigs & Offshore Platforms: Island‑mode multi‑generator power distribution control.
- Passenger Ships & Ferries: Critical onboard power generation system control.
- Ship Retrofit Projects: Replacement of old‑generation Uzushio generator control panels.
- Marine Emergency Power System: Backup generator auto‑start and synchronisation control.
Supporting Components
- UST‑201‑D interface board (matching signal acquisition PCB)
- UST‑205‑D expansion I/O board
- Generator current transformers and voltage transformers
- Generator circuit breaker trip & close coil circuits
- Engine speed governor and AVR excitation regulator
- 24V DC marine auxiliary power supply
- Ship central PMS system
- Shielded RS485 / CAN communication cables
- Marine classification approved signal wiring and terminal blocks
Related Series Models (BEMAC Marine Generator Control Family, 8 Models)
- UGS‑11 — Early‑generation single generator controller
- UGS‑21 — Multi‑genset parallel controller (target model)
- UGS‑31 — High‑capacity PMS master controller
- UST‑201‑D — Signal acquisition interface board for UGS series
- UST‑205‑D — Digital I/O expansion PCB
- UVR‑21 — Generator voltage regulation module
- USR‑22 — Speed control interface unit
- ULS‑20 — Marine load sharing module
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