Tadiran Telecom Swift Inverter 9U, Service Manual

Page: 54 / 115

53
（
14
）
F6- external temperature sensor error
Explanation of
error
Cause: The detection of short circuit or open circuit of external
termperature sensor during the inspection of main external control
panel, indicated by "external termperature sensor error".
Inspection path:
Sensor→Sensor wire→Connectors→Main external
control panel
Tools required
for inspection
Multimeter, 15KΩ standard sensor
（
25
℃ ）
Frequent
problematic part
External temperature sensor, main external control panel.
Inspection
procedure and
key points
1. Check whether there’s resistance problem, short circuit or open
circuit in the sensor; the resistance value shall be within a reasonable
range (15KΩ under the temperature of 25
℃
).
2. Check whether the sensor wire is broken.
3. Check whether the terminal connectors are well fixed; check
whether the weld between the terminal and the main control panel is
loose, and pull the terminal slightly for inspection if necessary.
4. Check whether the sensor is affected with damp.
5. In case no standard sensor is available at present, replace the
external temperature sensor with the other sensor asides, and then
check whether the error still exists; if the error disappears, replace the
sensor; if the error still exists, it's possible that the main control panel
is faulted, change the main external control panel.
Special attention
Most of the standard resistance values of the external temperature
sensors are 15KΩ (hen temeperature is at 25
℃
), and the higher the
temeprautre is, the lower the resistance value is, and the lower the
temperature is, the higher the resistance value is. Do not use improper
sensor during repairing and maintenance, or it may led to the wrong
temperature sensing of the machine.