FILM-INSTRUMENT PANEL 1975113 - Caterpillar

High Pressure Sensors
Illustration 5 g02263513Note: The values in Table 6 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 6
Operating Pressure 50 MPa
Supply Voltage +7V ~ +14V
Output Signal 500 100 Hz (PWM)
Output Range 5% ~ 95% Drive Pump Pressure Sensor and Idler Pump Pressure Sensor
The drive pump pressure sensor and idler pump pressure sensors are inputs to the machine ECM. The drive pump and idler pump pressure sensors are located on the main control valve. The drive pump pressure sensor monitors the pressure of the drive pump oil in the front half of the main control valve high-pressure passages. The idler pump pressure sensor monitors the idler pump oil pressure in the rear half of the main control valve high-pressure passages. The pressure sensors send a pulse width modulated (PWM) input to the machine ECM. This pressure information is used for pump control and travel speed.Outputs
The ECM responds to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician.On/Off Solenoids
Illustration 6 g01158530Note: The values in Table 7 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 7
Rated Voltage 24 VDC
Coil Resistance 32.0 3.2Ω (T=20° C) Swing Priority Solenoid
When swing priority is activated, the output flow from the idler pump supplies hydraulic oil to the swing hydraulic circuit, Since swing priority increases the swing acceleration, swing priority is useful for loading operations. Swing priority is also useful for leveling operations and trenching operations when higher swing force is required.The machine ECM uses the swing control pressure sensor to control the swing priority solenoid. Whenever the pilot pressure exceeds 2750 kPa (400 psi) the machine ECM de-activates swing priority solenoid in order to enable swing priority.For more information on the swing priority solenoid, refer to Systems Operations, "Swing System".Swing Brake Solenoid
The swing brake solenoid is an output of the machine ECM. The swing brake solenoid is energized in order to release the swing brake. When the swing brake is released, the upper structure is free to rotate. The swing brake is released when the control levers are actuated. The swing brake solenoid is de-energized approximately 6.5 seconds after any lever is moved to the NEUTRAL position.Hydraulic Lock Solenoid
The hydraulic lock solenoid is an output of the Machine ECM. The hydraulic lock solenoid is energized in order to enable the primary hydraulic pressure. The hydraulic lock solenoid is de-energized in order to disable the primary hydraulic pressure.This solenoid is activated while the key switch is in the ON position and the hydraulic lock lever is in the UNLOCK position.Proportional Reducing Solenoid Valve
Illustration 7 g02703776Note: The values in Table 8 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 8
Current Range 0 mA ~ 700 mA
Coil Resistance 11.5 0.5Ω (T=20° C) Power Shift Pressure PRV
The power shift pressure PRV is used to destroke the main pump under load to maintain