Woodward LS-521 V2 (Option K12) Circuit Breaker Control Unit

Woodward LS-521 V2 (Option K12) Circuit Breaker Control Unit

Product Overview and Safety Notice

1.1 Product Introduction

LS-521 V2 (Option K12) belongs to the Woodward LS-5 series and is an intelligent control device with dual system monitoring, synchronous grid connection, circuit breaker control, and power parameter measurement functions. Its hardware version is V2, supporting 6 current transformer input terminals, suitable for various wiring modes such as three-phase four wire, three-phase three wire, single-phase three wire, and single-phase two wire.

1.2 Important Safety Warning

Overspeed shutdown protection: The prime mover must be equipped with an overspeed, overtemperature, or overpressure shutdown device independent of the control device to prevent equipment damage or personal injury caused by control failure.

Unauthorized modifications are prohibited: Any modifications that exceed mechanical, electrical, or operational limitations are considered "misuse" or "negligence" and may result in the invalidation of warranty and equipment certification.

Static protection: The controller contains static sensitive components, and body static electricity must be released before operation to avoid contact with circuit board conductors.

Battery charging device: Before disconnecting the battery, the charging device must be turned off to prevent damage to the control system.

1.3 Manual Update and Revision

The latest version of this manual can be obtained through the Woodward official website. Revision history shows that the D version released in April 2022 added synchronous grid connection parameters and CAN commands, and corrected the phase angle definition in the wiring diagram and CAN messages.

Installation and wiring

2.1 Mechanical Installation

Shell type: Plastic shell with LCD display screen, panel mounted.

Hole size: 138 mm (height) x 186 mm (width), tolerance+1.0/+1.1 mm.

Installation method: Supports fixture fixation or screw fixation, the latter can achieve IP65 protection level.

2.2 Power Supply and Grounding

Power input: 12/24 Vdc, range 8-40 Vdc, recommended to use 6A slow melting fuse or C-type miniature circuit breaker.

Functional grounding: A grounding wire of ≥ 2.5 mm ² must be connected through terminal 55 to prevent the risk of electric shock.

2.3 Voltage and current measurement wiring

2.3.1 Voltage Measurement of System A and System B

Input terminals: divided into two groups of 120 Vac and 480 Vac, cannot be used simultaneously.

Wiring method: Select the corresponding terminal according to the system configuration (such as 3Ph4W, 3Ph3W, 1Ph2W, etc.).

PT setting: The rated voltage of the PT primary and secondary sides needs to be set in the parameters.

2.3.2 Current measurement

CT input: Supports 5A or 1A secondary current, system A supports L1 L2 L3 or single-phase measurement.

Safety precautions: Before disconnecting the CT, the secondary must be short circuited to prevent open circuit high voltage.

2.4 Discrete Input and Relay Output

Discrete Input (DI): 8 channels, supporting positive/negative polarity, configurable as normally open or normally closed.

Relay output: 6 channels, with R5 fixed as "closing CBA", R6 fixed as "opening CBA" in dual relay mode, and the rest can be freely programmed through LogicsManager.

2.5 Communication Interface

Service port: RJ-45 interface, needs to be connected to PC with Woodward DPC cable.

CAN bus: Supports CANopen protocol and requires the installation of 120 Ω terminal resistors at both ends. The maximum length depends on the baud rate (e.g. 125 kbit/s corresponds to 100 meters).

Configuration and parameter settings

3.1 Configuration Method

Front panel operation: Basic settings can be made through buttons and the display screen.

PC software ToolKit: Visualize configuration and data monitoring through Woodward ToolKit software.

3.2 Key parameter group

3.2.1 Language and Clock

Supports multilingual display and can be configured to automatically switch between daylight saving time.

3.2.2 Passwords and Access Levels

CL0 (user level): Monitoring only, no password.

CL1 (Service Level): Password 0001, basic parameters can be modified.

CL2 (temporary debugging level): one-time password, valid for 2 hours.

CL3 (debugging level): Password 0003, full parameter access.

3.2.3 System Management

Device address (1-31), backlight control, key locking, factory reset, etc.

3.2.4 Circuit Breaker Control Configuration

CBA control mode: 1 relay or 2 relay mode.

Synchronization parameters: frequency difference, voltage difference, phase angle compensation, maximum phase angle, etc.

Dead zone closure: Supports dead zone closure between systems, with configurable delay time and voltage threshold.

3.2.5 Monitoring Configuration

System A/B voltage and frequency limits: Set the normal operating window and hysteresis value.

Phase sequence monitoring: can detect system A/B phase sequence errors and phase sequence mismatches.

CAN interface monitoring: Heartbeat timeout alarm can be set.

3.2.6 Measurement Configuration

Rated frequency, voltage, current, power and other reference values.

Voltage measurement method (phase phase or phase neutral point) and phase sequence assumption.

3.2.7 Interface Configuration

CAN baud rate (20 kbit/s to 1 Mbit/s), CANopen master-slave mode, RS-232 parameters, etc.

Operation and Display

4.1 Front panel layout

Mode button: Switch between manual/automatic mode.

Function buttons: alarm list, main menu, parameter settings, confirm, return, etc.

Indicator lights: System A/B status, circuit breaker status, alarm indication.

4.2 Screen Structure and Navigation

Main screen: displays key parameters such as A/B voltage, frequency, and power of the system.

Alarm List: Display unconfirmed alarms and their occurrence times.

Parameter menu: Access configuration items.

Main menu: Measurement Value, Synchronous Oscilloscope, Counter, Diagnosis, Event History, etc.

4.3 Synchronous oscilloscope function

Graphically display the phase angle difference between system A and B to assist in synchronous operation.

LogicsManager Logic Manager

5.1 Function Overview

LogicsManager allows users to customize control sequences through logical combinations, such as relay actions, alarm responses, etc.

5.2 Logical Elements

Command variables: including alarm class, system status, discrete input/output, etc.

Operators: AND, OR, NAND, NOR, XOR, etc.

Output: Relay or internal function.

5.3 Application Examples

By combining discrete inputs, system states, and alarm conditions, complex chain control logic is achieved.

6、 Communication Protocol and Data Exchange

6.1 CANopen Protocol

Sending messages: 4 fixed messages, including voltage difference, frequency difference, phase angle, power, status bit, etc.

Receiving messages: Remote control messages used for circuit breaker operation, alarm confirmation, etc.

6.2 Data Format

Voltage, current, power and other data with scaling factors support the transmission of large-scale measurement values.

Technical data and performance

7.1 Electrical Parameters

Power supply: 8-40 Vdc, power consumption approximately 6W.

Voltage measurement: 120 Vac (maximum 150 Vac) or 480 Vac (maximum 600 Vac).

Current measurement: 1A or 5A CT input, linear range 1.5 x rated value.

Discrete input: 8-40 Vdc, input resistance of approximately 20 k Ω.

Relay output: Contact capacity 2A @ 250 Vac, 2A @ 24 Vdc.

7.2 Environment and Machinery

Working temperature: -20 ° C to+70 ° C.

Protection level: Front panel IP54 (clamp) or IP66 (screw), rear panel IP20.

Vibration and impact: Complies with EN 60255-21 and MIL-STD-810 standards.

Certification: CE, UL/cUL, LR classification society certification.

7.3 Measurement accuracy

Frequency: ± 0.1% (range 85 Hz).

Voltage: ± 1% (range 120/480 V).

Current: ± 1% (range 1/5 A).

Power: ± 2% (range voltage x current).

Appendix and Maintenance Information

8.1 Interference Suppression Circuit

When connecting a 24V relay, it is recommended to use diodes, varistors, or RC circuits to suppress turn off voltage spikes.

8.2 Alarm classification

Class A: Only display, no relay action.

Class B/C: Trigger alarm light and horn.

Class D/E/F: Immediately open the circuit breaker.

8.3 Event History

Record 300 events, including status changes, alarms, and operation records.

8.4 Service Support

Before returning for repair, an authorization number (RAN) must be applied for in advance.

Provide technical assistance, training, on-site debugging and other services