Mitsubishi Electric PURY-P200, Service Handbook

Page: 166 / 224

63LS
Connector
GND (Black)
Vout (White)
Vcc (DC5V) (Red)
1
2
3
Pressure
0.173V/0.098MPa
0 ~ 1.7MPa
Vout 0.5 ~ 3.5V
1 2 3
Conduct the check comparing the pressure that is detected by the low-pressure pressure sensor and the
low-pressure gauge pressure. (1)
Low-pressure pressure configuration
1 2 3 4 5 6 7 8 9 10
ON
The pressure that is detected by the low-pressure pressure sensor will be displayed on the LED screen, LD1 when
setting the digital shift switch (SW1) as shown below.
(1) Compare the gauge pressure and the pressure that is displayed on LD1 while the sensor being stopped.
(a) When the gauge pressure is 0~0.098MPa
→
Inner pressure drop due to gas leak.
(b) When the pressure that is displayed on LD1 0~0.098MPa
→
Contact failure of the connector Check for
the contact and proceed to (4).
(c) When the pressure that is displayed on LD is 1.7MPa or more
→
Proceed to (3).
(d) When (a), (b), and (c) are not applied, compare the pressure while the sensor is operating.
→
Proceed to (2).
(2) Compare the gauge pressure and the pressure that is displayed on LD1 while the sensor is operating. (Com-
pare by MPa unit.)
(a) When the difference between the both pressure is within 0.03MPa
→
Both the low-pressure pressure sen
sor and the main board are normal.
(b) When the difference between the both pressure is over 0.03MPa
→
The low-pressure pressure sensor is
defective (particular deterioration).
(c) When the pressure that is displayed on LD1 does not change
→
The low-pressure pressure sensor is defective.
(3) Remove the low-pressure pressure sensor from the main board and check the pressure that is displayed on LD1.
(a) When the pressure that is displayed on LD1 is 0~0.098MPa
→
The low-pressure pressure sensor is defective.
(b) When the pressure that is displayed on LD1 is approximately 1.7MPa
→
The main board is defective.
• When the outdoor temperature is 30˚C or less
→
The main board is defective.
• When the outdoor temperature is over 30˚C
→
Proceed to (5).
(4) Remove the low-pressure pressure sensor from the main board, short circuit between the No.2 and No.3 con-
nector (63LS), and check the pressure that is displayed LD1.
(a) When the pressure that is displayed on LD1 is 1.7MPa or more
→
The low-pressure pressure sensor is defective.
(b) When (a) is not applied
→
The main board is defective.
(5) Remove the high-pressure sensor (63HS) from the main board, insert it into the low-pressure pressure sensor
(63LS), and check the pressure that is displayed on LD1.
(a) When the pressure that is displayed on LD1 is 1.7MPa or more
→
The main board is defective.
(b) When (a) is no applied
→
The low-pressure pressure sensor is defective.
The low-pressure pressure sensor is composed of the circuit
as shown in the right figure. When DC5V is applied between
Vcc and GND, the voltage that is appropriate for the pressure
between Vout and GND will be output, and it will be taken by
the microcomputer.
The output voltage is 0.173V/0.098MPa.
✻
The pressure sensor on the body side is specified for con-
nector connection.
The connector pin number on the body side is different
from that on the main board side.
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0 0.5 1 1.5 2 2.5 3 3.5
Output voltage [V]
Pressure
[MPa]
Body side Main board side
Vcc Pin 1 Pin 3
Vout Pin 2 Pin 2
GND Pin 3 Pin 1
(2)
- 163 -
2. Low-pressure pressure sensor (63LS)