Description
Woodward 8440-1947
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 8440-1947 |
| Manufacturer | Woodward |
| Series | LS-5 |
| Controller Model | LS-521 |
| Configuration | 5 A / P1 |
| Controller Function | Synchronization, load sharing, breaker control and protection |
| Supply Voltage | 12/24 VDC |
| Operating Range | 8–40 VDC |
| Current Input | 5 A CT configuration |
| Voltage Measurement | Software configurable, 120 VAC or 480 VAC class |
| Discrete Inputs | 8 isolated inputs |
| Relay Outputs | 6 potential-free outputs |
| Communication | CAN bus, RS-485 |
| Mounting | Front-door mounting |
| Display | Graphic LCD |
| Approx. Dimensions | 219 × 171 × 61 mm |
| Operating Temperature | -20 to +70°C |
| Humidity | Up to 95%, non-condensing |
The 8440-1947 is specifically listed by Woodward as the LS-521 5 A part number, while 8440-1952 is the corresponding 1 A version. That distinction is important when matching CT secondary ratings.
Product Introduction
The Woodward 8440-1947 is an LS-521 controller used for generator synchronization, load sharing, circuit-breaker control, and associated protection functions. It belongs to Woodward’s LS-5 architecture, which was designed to coordinate multiple incoming mains and bus breakers together with generator-set controllers such as the easYgen-3400/3500 family.
The 5 A configuration makes the CT interface particularly important during replacement. This is not simply a display or supervisory module; it participates directly in electrical measurements and breaker-control sequences. A replacement must therefore match the CT secondary configuration, voltage measurement configuration, communication arrangement, and application parameters.
8440-1947
Engineering Pain Point
The biggest replacement risk with 8440-1947 is selecting another LS-5 unit based only on the model family. Woodward produced both 1 A and 5 A LS-5 variants, and the LS-521 also differs from the LS-511 in housing and mounting arrangement. A physically similar controller with the wrong current-input configuration can produce incorrect generator-load measurements even if the display and communications appear normal.
Typical Applications
- Generator synchronization for multiple generator sets operating in parallel.
- Load sharing and loading/unloading control across multiple bus segments.
- Circuit-breaker control and protection on generator and incoming-main breakers.
- Marine and industrial power-management systems requiring front-panel monitoring and control.
- Generator systems using CAN-connected easYgen controllers, where the LS-5 manages synchronization and sends voltage/frequency references over the control network.
Technical Pitfalls to Avoid
- Confirm the CT secondary rating.
8440-1947 is the 5 A LS-521 configuration. Do not substitute the 1 A 8440-1952/8440-1951 family without confirming the complete measurement circuit. - Distinguish LS-521 from LS-511.
The LS-521 uses the front-door housing with graphic LCD, while the LS-511 is designed for back-panel/DIN-rail installation. The two are not mechanically equivalent simply because they belong to LS-5. - Check voltage-measurement configuration.
The controller supports configurable voltage measurement classes. Verify the existing setting and VT/PT arrangement before commissioning a replacement. - Record the existing configuration before removal.
Synchronization limits, breaker timing, load-sharing parameters, protection settings, CAN-network configuration, and I/O assignments should be documented before replacing the controller. - Verify the exact hardware revision.
Field records identify units such as LS-521-5/P1 with different revision markings. When replacing an installed controller, match the complete nameplate information rather than relying only on 8440-1947.
Related Products
- Woodward 8440-1951 — LS-511, 1 A configuration; back-panel/DIN-rail form factor rather than the LS-521 front-panel configuration.
- Woodward 8440-1946 — LS-511, 5 A configuration; same 5 A measurement class but different housing/mounting arrangement.
- Woodward 8440-1952 — LS-521, 1 A configuration; front-panel LS-521 counterpart with a different CT input class.
- Woodward 8440-2074 — another LS-5 family configuration; exact application and measurement configuration should be verified before substitution.
- Woodward 8440-2075 — LS-5 family controller variant; not automatically interchangeable with 8440-1947.
- Woodward 8440-2076 — LS-5 family configuration requiring confirmation of the installed system’s measurement and control requirements.
- Woodward 8440-2077 — another LS-5 configuration; verify current firmware, I/O, and electrical configuration before considering replacement.
Procurement check: For 8440-1947, the critical identifiers are LS-521, 5 A configuration, P1 designation, front-panel mounting, and the installed application configuration. Match those against the controller nameplate and Woodward documentation before approving a substitute.
