Usage:
Power Supply
The power supply for the ProAct II? driver is configured to operate from 20 to 32 Vdc. The minimum current level to be provided by the system will be 6 A dc and 12 A dc for up to two seconds.
Actuator Position Feedback
The actuator position feedback output provides a nominal 0.5 to 4.5 Vdc corresponding to 0% to 100% actuator travel. The actuator position feedback will filter the position output signal using a low-pass filter with a cut-off frequency of 40 Hz. The actuator position output has gain and offset adjustments to trim the voltage output for the proper voltages at the correct positions.
System Wiring
The actuator driver is capable of driving the actuator through wiring harnesses of the following configurations:
The maximum length of the line distance between the battery summed with twice the distance between the control and the actuator must be less than the distance in the following chart.
Under no circumstances should the maximum length calculated using the formula above be greater than 16.8 m (55 ft).
In applications where these maximum line lengths are followed, the worst case transient current level at elevated actuator temps (100°C ambient) will be 57.5% of the transient limit. This only affects the transient current limits, the steady state limits will still be 6 A.
Input Configurations
The following input configurations are available for the position command input.
PWM
The PWM input will accept a 1000±100 Hz input signal of 5 to 32 V peak voltage (referenced to unit battery ground). The nominal input of 10% to 90% duty cycle will correspond to 0% to 100% actuator travel (at system calibration temperature). The position command input will be capable of providing a common mode input voltage range (unit battery ground referenced) of 0 to 4 V for all inputs.
0-200 mA
The 0-200 mA input will accept a 0 to 200 mA dc input. The nominal input of 20 to 160 mA will correspond to 0% to 100% actuator travel (at system calibration temperature). The position command input will be capable of providing a common mode input voltage range (unit battery ground referenced) of 0 to 4 V for all inputs.
4-20 mA
The 4-20 mA input will accept a 0 to 20 mA dc input. The nominal input of 4 to 20 mA will correspond to 0% to 100% actuator travel (at system calibration temperature). The position command input will be capable of providing a common mode input voltage range (unit battery ground referenced) of 0 to 4 V for all inputs.
11-20 mA
The 11-20 mA input will accept a 0 to 20 mA dc input. The nominal input of 12 to 20 mA will correspond to 0% to 100% actuator travel (at system calibration temperature). The position command input will be capable of providing a common mode input voltage range (unit battery ground referenced) of 0 to 4 V for all inputs.
4-13 mA
The 4-13 mA input will accept a 0 to 20 mA dc input. The nominal input of 4 to 12 mA will correspond to 0% to 100% actuator travel (at system calibration temperature). The position command input will be capable of providing a common mode input voltage range (unit battery ground referenced) of 0 to 4 V for all inputs.
0-5 Volt
The 0-5 V input will accept a 0 to 5 Vdc input. The nominal input of 0.5 to 4.5 V will correspond to 0% to 100% actuator travel (at system calibration temperature). The position command input will be capable of providing a common mode input voltage range (unit battery ground referenced) of 0 to 4 V for all inputs.
System Performance
The performance of the driver when mated to a ProAct II actuator will be as follows:
Inertia level
The driver mated to a ProAct II actuator can drive inertial loads not to exceed 5.9* 10-3 in-lb-sec2. This is specified as un-damped direct inertia.
Actuator compliance
The actuator compliance will be to reach peak steady-state torque in less than 5% of actuator full travel, external deflection of the actuator from commanded position for all supply voltages and current levels within the specified power supply ranges.
Actuator slew rate
The actuator slew rate will be between 80 mS and 100 mS for a 10% to 90% or 90% to 10% actuator slew, commanded with the appropriate input square wave for all supply voltages, current levels and inertial loads within the specified ranges.
Small signal bandwidth
The small signal (1% of full stroke actuator travel sine wave actuator drive) bandwidth of the driver for command to position will be between 6 and 8 Hz for the -3 dB point and 3 and 4 Hz for -45 degree phase loss point, for all supply voltages, current levels, and actuator load inertias within the specified ranges.
Large signal bandwidth
The large signal (10% of full stroke actuator travel sine wave actuator drive) bandwidth of the driver for command to position will be between 10 and 15 Hz for the -3 dB point and between 4 and 5 Hz for the -45 degree phase loss point, for all supply voltages, current levels, and actuator load inertias within the specified ranges.
Position accuracy
The position accuracy for command to position will be better than 1% of actuator full travel after the unit has been calibrated to the actuator for gain and offset. This accuracy is valid at the calibration temperature of the actuator assembly. If the actuator assembly temperature is different from the calibration temperature, the position error will be less than 20% over the entire temperature range. The temperature deviation is a negative tolerance. This means that the unit will drift such that minimum fuel and maximum fuel is always reachable using the standard input range. However, the unit may reach minimum or maximum fuel at input percentages 20% less than (in the case of maximum fuel) or greater than (in the case of minimum fuel) the nominal range.
Unit-to-unit position accuracy
The unit-to-unit position accuracy for two units that have been calibrated and are mounted on the same engine, operating from the same command signal and at the same temperature, will be less than 5% for all actuator temperatures within the specified operating range.
System protection
The system contains protection circuitry to prevent damage if the power supply circuits are connected in reverse polarity. The unit also contains circuitry to prevent driver and actuator damage if one of the actuator wires is short-circuited to battery positive or ground, or if one actuator wire is shorted to the other. The result will be an actuator shutdown during the period of the short circuit. The unit also contains circuitry to prevent driver and actuator damage if the driver steady-state current rises above 6 A continuously. The result will be an actuator shutdown.