Machine Systems
Operating & Maintenance Manual
Book: 22846430 (8-21-06) Rev. A
85
The wedge uses the frequency throttle to communicate with the engine. A square wave
frequency signal from 150 Hz to 375 Hz is sent from the WEDGE controller to the engine
controller.
The signal is a linear signal from 150 Hz at engine idle (1200 RPM) to 375 Hz at maximum run
speed (1800 RPM). Figure 2-2 shows the signals between the engine controller and the
WEDGE controller.
Sensors and Transducers
The electronics system contains sensors and transducers that are used to collect data from
the compressor. The temperature is measured by a thermistor. This device exhibits a change
in resistance as the temperature changes. The resistance causes an input voltage change to
the WEDGE controller input and is interpreted as a temperature change.
The electronics system also uses pressure transducers to measure compressor pressure
changes. These devices have an output signal of .45 VDC to 4.5 VDC, corresponding to 0 psi
and the maximum measured psi for a particular device. The maximum pressure transducer
ranges are 100, 225 and 500 psi. The 100, 225 and 500 psi devices are gauge pressure
devices. These transducers are provided with 5 VDC excitation to power the device. These
are three wire devices: excitation, signal and ground.
Digital Inputs and Outputs
The WEDGE controller scans digital inputs such as switch contacts. These are either "ON"
(24VDC) or "OFF" (0 VDC). These digital inputs are connected to switches within the package
such as the key start switch, air filter switches and IQ filter switches.
The WEDGE controller provides 24 VDC digital outputs to control solenoids, start compressor
and DC heaters. These are 24 VDC "ON" and 0 VDC "OFF". They are current limited and
short circuit protected.
Controller Outputs
The WEDGE controller has three types of outputs: frequency, pulse width modulated (PWM)
and 24 VDC digital (ON /OFF). The frequency output is used as a throttle signal for the engine.
The WEDGE controller varies the frequency from 150 Hz to 375 Hz, corresponding to 1200 to
1800 RPM. The frequency signal is a 50% duty cycle, 24 VDC, square wave. This throttle
signal is used with the Cummins engine.
The PWM signal is used as a throttle signal for the Caterpillar engine. It has a base frequency
of 500 Hz and the duty cycle varies from 10% to 90%.
Pressure Control
The discharge pressure is controlled by manipulating the engine speed and compressor inlet
valve position. The inlet valve position is controlled pneumatically and the engine speed is
determined by the WEDGE controller. The WEDGE measures the pneumatic system
regulation pressure and computes an engine throttle setting. This throttle setting is sent to the
engine via the frequency throttle, PWM or J1939 throttle, depending on which technique is
used. The engine controller will control engine speed to this throttle setting.
Содержание HP915WCU
Страница 6: ...6 TABLE OF CONTENTS Operation Maintenance Manual TITLE PAGE...
Страница 7: ...Book 22846430 8 21 06 Rev A 7 Foreword...
Страница 10: ...10 Book 22846430 8 21 06 Rev A Always use Ingersoll Rand Replacement parts...
Страница 11: ...Book 22846430 8 21 06 Rev A 13 Safety...
Страница 19: ...Book 22846430 8 21 06 Rev A 21 Noise Emission...
Страница 24: ...26 Always use Ingersoll Rand Replacement parts...
Страница 25: ...Book 22846430 8 21 06 Rev A 27 General Information...
Страница 26: ...Operating Maintenance Manual General Information 28 Book 22846430 8 21 06 Rev A General Information MSA SRG HRG...
Страница 27: ...General Information Operating Maintenance Manual Book 22846430 8 21 06 Rev A 29...
Страница 30: ...32 Always use Ingersoll Rand Replacement parts...
Страница 31: ...Book 22846430 8 21 06 Rev A 33 Operating Instructions...
Страница 52: ...Operating Maintenance Manual Operating Instructions 54 Book 22846430 8 21 06 Rev A...
Страница 53: ...Book 22846430 8 21 06 Rev A 53 Maintenance...
Страница 73: ...Maintenance Operating Maintenance Manual Book 22846430 8 21 06 Rev A 73 Torque Values...
Страница 77: ...77 Always use Ingersoll Rand Replacement parts...
Страница 78: ...Operating Maintenance Manual Maintenance 78 Book 22846430 8 21 06 Rev A...
Страница 79: ...Book 22846430 8 21 06 Rev A 79 Machine Systems...
Страница 81: ......
Страница 82: ...Operating Maintenance Manual Machine Systems 82 Book 22846430 8 21 06 Rev A...
Страница 83: ...Machine Systems Operating Maintenance Manual Book 22846430 8 21 06 Rev A 83...
Страница 84: ...Operating Maintenance Manual Machine Systems 84 Book 22846430 8 21 06 Rev A...
Страница 88: ...Operating Maintenance Manual Machine Systems 88 Book 22846430 8 21 06 Rev A...
Страница 89: ...Book 22846430 8 21 06 Rev A 85 Fault Finding...
Страница 94: ...90 Book 22846430 8 21 06 Rev A Always use Ingersoll Rand Replacement parts...
Страница 95: ...Book 22846430 8 21 06 Rev A 91 Options...
Страница 100: ...96 Book 22846430 8 21 06 Rev A Always use Ingersoll Rand Replacement parts...
Страница 101: ...2004 Ingersoll Rand Company Printed in the USA...
