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Woodward L-Series Position Controller Installation and Operation Manual - PWM/CAN Position Control Operation Guide
Source: | Author:kongjiang | Published time: 2026-06-24 | 180 Views | 🔊 Click to read aloud ❚❚ ▶ | Share:
Woodward L-Series Position Controller Installation and Operation Manual - PWM/CAN Position Control Operation Guide

System Description/Application Overview

System Operation
The L-Series actuator is ready for operation immediately (within 0.25 seconds) when the power supply is connected. Power may be connected to the control at the same time the engine starter motor is engaged. Upon power-up, the actuator will immediately go to the commanded position. The actuator will then drive to maintain the position commanded by the supervisory control.
Optionally, a Run Enable input can be used to activate or deactivate the   L-Series output. It can also be used to reset shutdown fault conditions.
Upon an engine shutdown command, the independent engine shutdown solenoid or solenoid valve in the fuel supply should be deactivated, and the power supply disconnected from the speed control. This shutdown signal should be sent directly from the engine control panel and should be independent and separate from the L-Series controller.
Driver Input Power
The L-Series will handle a voltage range of 10 to 28 Vdc at full specified torque. The actuator is functional in the range of 8 to 32 Vdc, but accuracy and/or torque can be diminished at the extreme ends of this range.
The supply voltage failure levels are below 6.25 V and above 33 V. The unit can be configured to either alarm or shut down upon detection of a supply voltage fault.
Position Command Signal
The L-Series can accept either a PWM command signal input or an analog 0–5 Vdc command signal input, depending on how the software application is configured.
The PWM will function with various types of input sources, including high-side, low-side open collector, and push-pull, depending on the configuration. It will handle a PWM frequency range from 300 to 1500 Hz at amplitudes ranging from 5 V up to battery voltage. Normal operating range is from 10% to 90% duty cycle, representing the hard stops in the actuator (Figure 2-1). The input can be optionally set to a non-linear mode, which provides a 5-point curve relationship between the position signal and the desired position (Figure 2-2).
The input failure levels are below 3% and above 97% duty cycle. The unit can be configured to either alarm or shut down on detection of a position command failure. The shutdown failsafe direction is also user configurable as either clockwise or counterclockwise.
A user-configurable offset is available to adjust the input duty-cycle reading, as needed.
The 0–5 V input uses a different pin in the connector, and it has a usable range of 0.5 to 4.5 V to command the throttle from minimum to maximum position (Figure 2-3). The input can be optionally set to a non-linear mode, which provides a 5-point curve relationship between the position signal and the desired position (Figure 2-4).
The input failure levels are below 0.2 and above 4.8 V. The unit can be configured to either alarm or shut down on detection of a position command failure. The shutdown failsafe direction is also user-configurable as either a clockwise or counterclockwise direction.
Discrete Output
A discrete output is provided to serve as a status indicator. This switchable discrete output is a closure to ground capable of sinking 250 mA with an output voltage rise of less than 1.5 V, and it is available to power external relays for devices such as alarms or fuel shutoff solenoids. The circuit is protected internally against overcurrent and inductive spikes, so external clamping is not necessary.
This output can be configured to be either normally on/open (preferred failsafe setting) or normally off/closed. In addition, the faults that drive the relay status can be configured individually. For details, refer to Chapter 4 (Service Tool).
There are two conditions that will prevent the discrete output from operating correctly. The first is if the battery's positive is accidentally connected to it, and the second is if it is shorted to ground. The circuit will protect itself in the event of a mis-wire, but it will hold the output open(floating) until the fault is removed.
Run Enable Discrete Input
An optional Run Enable discrete input can be configured for use. The Run Enable operation provides a closed-to-run and an open to force the shaft controller into a low-current “limp” mode. The Run Enable can also be used to clear a latching shutdown condition since a closure of the input will issue a reset command.
Actual Position Feedback (TPS)
The L-Series provides a 0–5 V signal representing actual shaft rotational position, where 0.75 V and 4.25 V correspond to full counterclockwise to clockwise rotation, respectively. This signal is fed directly from the position sensor to ensure no delays are introduced by the processor. However, this signal is also uncorrected, so the difference between this signal and the actual position can vary up to ±10% over the operating temperature range.
Additional Inputs/Outputs
Auxiliary Inputs—There are four auxiliary inputs on the L-Series controller, all of which are capable of both analog and discrete functions. They can all be functionally defined for a purpose in the software application. Although they are very flexible, two of them are shared with the serial communications, so they will be unavailable if the L-Series is connected to the Service Tool. More detail concerning the auxiliary inputs is provided in Chapter 3 (Installation).
5V Output—A 5 Vdc output has been provided on the L-Series actuator to power external sensors, if necessary. The 5 V output is limited to 10 mA, but this is sufficient for most light-duty ratiometric sensors.
Communications
RS-232 communications are available on the L-Series when used with an external transceiver connected to pins 4 and 6. Serial communications allow for the use of a service and configuration tool with the L-Series actuator. The simplest way to establish this interface is to use the Woodward kit # 8923-1061.
Functions available through this port include tuning, monitoring, and configuration of the position controller. Detailed driver status information is also available.
Any RS-232 wiring must meet the requirements in the EIA RS-232 Standard document. The RS-232 standard states that the length of the RS-232 cable between the driver and the PC must be less than 50 ft (15 m) with a total capacitance less than 2500 pF. The RS-232 data rate is fixed at 19.2 kbps. The communication port is non-isolated and susceptible to both EMI noise and ground loops related to PC connections and typical industrial environments.
Temperature Sensing
The L-Series has an on-board temperature sensor to monitor board temperatures and protect the unit from overtemperature. This temperature is monitored, and a fault is annunciated if the set point is exceeded.
Current Limiting based on Temperature
The controller provides actuator current limiting based on the electronics temperature. Dependent on board and actuator thermal models, the software reduces current as necessary to avoid conditions that would damage the device due to extreme temperatures.
Current limiting based on temperature begins when the combined current and temperature environment causes board temperatures greater than 117 °C. The limit curve is a linear derate from full current at 117 °C down to zero current at 125 °C. At 125 °C, an OverTemp fault is annunciated. Depending on the current (actuator torque) and ambient operating temperatures, the unit may never reach a reduced level.
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