Idex Hale Sam, Техническое руководство

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4.16.2.3 Level Sensor Troubleshooting
The gearbox oil level sensor is an optical fluid level switch. It is positioned on SAM gearboxes to
alert the operator if a low- or-no oil condition is active. The gearbox must initially be filled with
the correct amount of oil, checked through the fill plug. When oil is detected, the sensor outputs
a signal to SAM to communicate that the minimally required amount of oil is present in the gear-
box.
On the SAM Pump Controller, CAN TS Diagnostic Screen (use Output/Input password, Table 3,
page 36), select the INPUTS screen and look for the Oil Level button. While keeping the sensor
connected to the SAM harness, remove the sensor from the gearbox body. Immerse the sensor
tip (see Figure 134) completely in gearbox oil to change the icon from red to green, indicating
that the sensor is working correctly.
Figure 134. Level Sensor Troubleshooting
The input supply voltage for this sensor is equal to the system voltage. This sensor uses light in
a prism to detect the presence or absence of oil and actuates a solid-state switched output volt-
age to SAM. When no-oil or liquid is detected, the sensor outputs zero voltage. Once oil or liquid
is detected, the sensor outputs a signal voltage that is equal to the input voltage.
4.16.2.4
PF Valve Troubleshooting
The following subparagraphs provide PF valve troubleshooting information.
4.16.2.5
Pressure Sensor Troubleshooting
•
The SAM system uses two different pressure sensors:
•
5 psiG sensor – used on water & foam tanks and also the SAM drain assembly
•
300 psiA sensor – used on intake & discharge sections of the pump and also all intake &
discharge valves
•
The input power supply for both types is 5.0 VDC. Measure the signal using a voltmeter with
the red lead on the signal wire and the black lead in the ground wire while the system is pow-
ered, and the sensor is connected to the harness. You may need to back probe the con-
nector. Do not pierce the wire insulation as this will create a point at which corrosion will
start. The nominal output signal varies between 0.5 VDC and 4.5 VDC, where:
•
0-5 psiG sensor
•
an average signal voltage of 0.5 VDC equals 0.0 psiG
•
an average signal voltage of 4.5 VDC equals 5.0 psiG