Product Description
Woodward 9905-971 Rev L DSLC Digital Synchronizer and Load Control
Product Overview
- The Woodward 9905-971 Rev L is a DSLC (Digital Synchronizer and Load Control), designed for precise synchronization and load sharing of generator sets in industrial power generation applications, including standalone systems, parallel operation with other generators, or grid paralleling. This microprocessor-based control unit is part of Woodward’s DSLC series, offering advanced synchronization, load management, and power control for diesel, gas, or dual-fuel generator sets. The DSLC provides automated breaker closure, voltage and frequency matching, load sharing, and power factor control, making it suitable for complex multi-unit power systems. The 9905-971 Rev L is a specific variant of the DSLC, featuring Revision L firmware or hardware updates, which may include improved performance, additional features, or enhanced compatibility compared to other DSLC models (e.g., 9905-968, 9905-377). It is designed to work with Woodward’s MSLC (Master Synchronizer and Load Control) for system-wide control and integrates with Woodward governor systems. The 9905-971 Rev L features robust communication protocols and a rugged design for reliable operation in harsh environments. It is distinct from Woodward’s DSLC-2 series (e.g., 8923-1262), EasyGen series (e.g., 8440-2179 EasyGen-3500XT, 8440-2050 EasyGen-3200-5), EGCP-3 series (e.g., 8444-1082), SPM-D2 series (e.g., 8446-1048), SPM-A series (e.g., 9905-001K), 505 series (e.g., 9905-792, 9905-864), 2301A series (e.g., 9905-463), MicroNet Plus (e.g., 8800-1001), TG-13 (e.g., 8516-050), Peak150 series (e.g., 8200-176), ProAct series (e.g., 8237-2595), 723PLUS series (e.g., 8270-1013), EPG systems (e.g., 8290-195), electronic governors (e.g., 8406-121), and actuators (e.g., 8408-921), focusing on digital synchronization and load control for generator sets.
Technical Specifications
- The 9905-971 Rev L has the following specifications based on industry sources and Woodward documentation:
| Specification | Details |
|---|---|
| Model/Part Number | 9905-971 Rev L |
| Manufacturer | Woodward |
| Description | DSLC Digital Synchronizer and Load Control for Generator Sets |
| Series | DSLC |
| Function | Synchronizes generator sets with busbar or utility grid; manages load sharing, power control, and breaker operation |
| Processor | Microprocessor-based (specific architecture not publicly detailed) |
| Memory | Flash: 8–16 MB (for firmware and configuration) RAM: 4–8 MB (for runtime data) |
| Display | No integrated display; uses external PC-based interface (Woodward Watch Window or Toolkit) or HMI |
| Inputs | 4 analog inputs (configurable for 4–20 mA, 0–5 V) 8 discrete inputs (24 VDC) 3 voltage inputs (generator, busbar, utility, 100–600 VAC) 3 current inputs (1 A or 5 A CTs) |
| Outputs | 2 analog outputs (4–20 mA or 0–5 V for speed and voltage bias) 6 relay outputs (dry contact, up to 250 VAC/5 A, for breaker control and alarms) 1 actuator output (compatible with Woodward governors, 4–20 mA or PWM) |
| Communication Interfaces | 1 serial port (RS-232/RS-485, Modbus RTU) 1 CANopen port (for communication with MSLC or other Woodward controls) Ethernet (optional, Modbus TCP) |
| Control Modes | Automatic synchronization, isochronous/droop load sharing, active/reactive power control, power factor control, grid-parallel operation |
| Redundancy | Non-redundant (system-level redundancy via multiple DSLC units) |
| Diagnostics | Fault detection, event logging (up to 300 events), real-time data trending, status LEDs |
| Compatibility | Woodward governors (e.g., 2301D, 505, 723PLUS), actuators (e.g., UG-8, ProAct, 8408-921), MSLC, and third-party devices via standard protocols; integrates with SCADA/DCS systems |
| Power Supply | 18–40 VDC (24 VDC nominal) |
| Power Consumption | Approx. 10–25 W |
| Environmental Specifications | Operating Temperature: -40°C to +70°C (-40°F to +158°F) Storage Temperature: -40°C to +85°C (-40°F to +185°F) Relative Humidity: 5% to 95% non-condensing Vibration: IEC 60068-2-6 compliant Shock: IEC 60068-2-27 compliant |
| Enclosure | IP54 (front panel, when properly mounted); IP20 (rear) |
| Dimensions | Approx. 305 mm (H) x 254 mm (W) x 76 mm (D) |
| Weight | Approx. 2–3 kg |
| Mounting | Panel-mounted or DIN-rail (with adapter) |
| Certifications | CE, UL, CSA, marine certifications (e.g., DNV, ABS, Lloyd’s Register); ATEX/IECEx Zone 2 (configuration-dependent) |