Komatsu PC200-8M0 Shop Manual page 296

SEN06123-00
2) Oil pressure sensor
1. Sensor
2. Connector
Function
q The junction block has 8 PPC oil pressure sen-
sors.
The travel PPC valve has 4 PPC oil pressure
sensors.
q This sensor detects the operating condition of
each actuator by the PPC pressure and trans-
mit it to the pump controller.
Operation
q The oil pressure is applied to the diaphragm of
the oil pressure sensor from the pressure
intake part, the diaphragm is deformed.
q The deformation in the diaphragm causes the
resistance of the gauge to change. This
causes a change in the output voltage, which
is transmitted to the amplifier (voltage ampli-
fier).
30
10-600
q The relationship between the pressure applied
to sensors (P) and output voltage (E) is shown
in the figure below.
q The amplifier magnifies output voltage (E) and
transmits it to the pump controller.
PC200, 200LC, 220, 220LC-8M0
600 Electrical system
Electrical control system