![Carrier VECTOR 1800 MT Скачать руководство пользователя страница 284](http://html1.mh-extra.com/html/carrier/vector-1800-mt/vector-1800-mt_operation-and-service-manual_2564194284.webp)
8-31
62-11039
8.20.1 Calibrating Compressor Discharge Pressure
Transducer
The Compressor Discharge Pressure Transducer
(CDP) has a range of 0 to 500 PSIG (0 to 34.0 Bar). With
this large of a pressure range, some transducers will not
read exactly the same as the next. To allow for
variations in transducers and still display an accurate
pressure reading in the Data List, there is a calibration
feature for the CDP built into the microprocessor.
To calibrate the CDP, it
must
be removed from the
compressor, and be exposed to 0 PSIG/Bar. During the
calibration process, the microprocessor measures the
difference between what the transducer is sending and
what the microprocessor was expecting for a zero
reading. The difference between these two is called an
offset. This offset is then stored in the microprocessor’s
memory, and is used in all future calculations for
displaying compressor discharge pressure.
NOTE
The Compressor Discharge Pressure on the
microprocessor Data List will never read less
than 0 PSIG/Bar, even if it is exposed to a
vacuum (such as when evacuating the system.)
Consequently, a transducer reading of 0 does
not indicate accurate calibration.
Every
Discharge Transducer must be calibrated
before being installed into a compressor.
a. Power up the transducer circuit. Place unit into PC
Mode (Refer to Section 5.1), or place unit in Manual
Start Mode.
b. Press the Select Key until
“PRESS
"#
TO VIEW DATA” appears in the
MessageCenter.
c. Press the Up Arrow until
“
DISCHARGE PRESSURE:
” is showing in the
MessageCenter.
d. Press and hold the Equal Key for 6 seconds. The
MessageCenter will blink 5 times. When it stops
blinking, the display will either show
“DISCHARGE PRESSURE: 0.0 Bar/PSIG”, or the
message “
CALIBRATION UNSUCCESSFUL
”.
e. When “DISCHARGE PRESSURE: 0.0 Bar/PSIG”
appears, the offset has been saved into the micropro-
cessor memory, and the calibration is complete.
f. If the calibration was unsuccessful, either there is
more than 0 Bar/PSIG on the transducer, or the trans-
ducer is further away from 0 than an offset will allow.
The transducer must be replaced.
8.20.2 Testing Compressor Discharge Pressure
Transducer
a. Verify that the wiring to the transducer is correct.
(See wiring diagram, Section 10.)
b. Power up the transducer circuit. Place unit into PC
Mode (Refer to Section 5.1), or place unit in Manual
Start Mode.
c. Check Voltage to transducer connector. Voltage
reading between A (negative) and B (positive) should
be 5.0 VDC.
d. Check wire resistance between C (output to micro-
processor) and 1MP5.
e. Place +5.0 VDC on transducer terminal B and --5.0
VDC on transducer terminal A. Disconnect C from
the microprocessor. Test voltage between B and C.
The reading should be as shown in table below.
Table 8-5. Compressor Discharge Pressure Transducer
PSIG
Bar
Voltage
PSIG
Bar
Voltage
PSIG
Bar
Voltage
0
0
0.5
80
5.4
1.1
250
17.0
2.5
10
0.7
0.6
90
6.1
1.2
275
18.7
2.7
20
1.4
0.7
100
6.8
1.3
300
20.4
2.9
30
2.0
0.7
125
8.5
1.5
325
22.1
3.1
40
2.7
0.8
150
10.2
1.7
350
23.8
3.3
50
3.4
0.9
175
11.9
1.9
375
25.5
3.5
60
4.1
1.0
200
13.6
2.1
400
27.2
3.7
70
4.8
1.1
225
15.3
2.3
450
30.6
4.1
CAUTION
The +5.0 VDC (terminal B) is common between the Compressor Discharge Pressure Transducer, the
Compressor Suction Pressure Transducer, and the RPM sensor. If this circuit is shorted to ground
(due to one of the mentioned components being defective, or a worn wire) the MessageCenter will
show:
Suction Pressure: --14.7 psig (--1 Bar)
Discharge Pressure: 0 Bar/PSIG
Engine RPM: 0.
Содержание VECTOR 1800 MT
Страница 1: ......
Страница 2: ...OPERATION SERVICE MANUAL for VECTOR 1800 MT Trailer Multi Temp Refrigeration Units ...
Страница 19: ...1 5 62 11039 1 3 SAFETY DECALS ...
Страница 20: ...1 6 62 11039 62 03958 00 Heat Warning 62 03957 01 High Voltage 62 60280 00 Standby Safety ...
Страница 21: ...1 7 62 11039 ...
Страница 303: ...10 1 62 11039 ...
Страница 310: ...10 8 62 11039 BASED ON ENGINEERING SCHEMATIC 62 60926 REV G NEXT SHT ...
Страница 311: ...10 9 62 11039 FROM PREVIOUS SHT ...