Mitsubishi Electric R410A, Service Handbook

Page: 262 / 346

[8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ]
- 253 - HWE14080 GB
8
Tr
oubles
hoot
ing Ba
se
d
o
n
Obs
erv
ed Sympt
o
ms
8-5 Pressure Sensor Circuit Configuration and Troubleshooting
Pressure Sensor Problems
8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure
By configuring the digital display setting switch (SW4 (when SW6-10 is set to OFF)) as shown in the figure below, the pressure
as measured by the high-pressure sensor appears on the LED1 on the control board.
(1) While the sensor is stopped, compare the gauge pressure and the pressure displayed on self-diagnosis LED1.
1) When the gauge pressure is between 0 and 0.098MPa [14psi], internal pressure is caused due to gas leak.
2) When the pressure displayed on self-diagnosis LED1 is between 0 and 0.098MPa [14psi], the connector may be defective or
be disconnected. Check the connector and go to (4).
3) When the pressure displayed on self-diagnosis LED1 exceeds 4.15MPa [601psi], go to (3).
4) If other than 1), 2) or 3), compare the pressures while the sensor is running. Go to (2).
(2) Compare the gauge pressure and the pressure displayed on self-diagnosis LED1 while the sensor is running. (Com-
pare them by MPa [psi] unit.)
1) When the difference between both pressures is within 0.098MPa [14psi], both the high pressure sensor and the control board
are normal.
2) When the difference between both pressures exceeds 0.098MPa [14psi], the high pressure sensor has a problem. (perfor-
mance deterioration)
3) When the pressure displayed on self-diagnosis LED1 does not change, the high pressure sensor has a problem.
(3) Remove the high pressure sensor from the control board to check the pressure on the self-diagnosis LED1.
1) When the pressure displayed on self-diagnosis LED1 is between 0 and 0.098MPa [14psi], the high pressure sensor has a
problem.
2) When the pressure displayed on self-diagnosis LED1 is approximately 4.15MPa [601psi], the control board has a problem.
(4) Remove the high pressure sensor from the control board, and short-circuit between the No.2 and 3 connectors
(63HS1) to check the pressure with self-diagnosis LED1.
1) When the pressure displayed on the self-diagnosis LED1 exceeds 4.15MPa [601psi], the high pressure sensor has a problem.
2) If other than 1), the control board has a problem.
8-5-2 High-Pressure Sensor Configuration (63HS1)
The high pressure sensor consists of the circuit shown in the figure below. If DC 5V is applied between the red and the black
wires, voltage corresponding to the pressure between the white and the black wires will be output, and the value of this voltage
will be converted by the microcomputer. The output voltage is 0.071V per 0.098MPa [14psi].
The pressure sensor on the body side is designed to connect to the connector. The connector pin number on the body side
is different from that on the control board side.
Œ
For how to read the SW settings, refer to the following page(s).
[9-1-1 How to Read the LED](page 301)
ON
SW4
1 2 3 4 5 6 7 8 9
10
OFF
Body side Control board side
Vcc Pin 1 Pin 3
Vout Pin 2 Pin 2
GND Pin 3 Pin 1
0
0.5 [73]
1.0 [145]
1.5 [218]
2.0 [290]
2.5 [363]
3.0 [435]
3.5 [508]
4.0 [580]
4.5 [653]
0 0.5 1 1.5 2 2.5 3 3.5
Output voltage ( V)
Pressure
(
MPa [psi])
Connector
63HS1
1 2 3
1
2
3
GND (Black)
Vout (White)
Vcc (DC 5 V)(Red)
Pressure 0 ~ 4.15 MPa [601psi]
Vout 0.5 ~ 3.5 V
0.071 V / 0.098 MPa [14 psi]