SR971,SR972 Solar station operation manual
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14
Power connection
Input is for power connection, is for connection with ground .
Input ports
Input T1
：
PT1000 temperature sensor use for collector.
Input T2 ~T5: NTC10K, B=3950 temperature sensor, for measuring temperature of tank and
pipeline
Advice regarding the installation of temperature sensors:
Only original factory equipped Pt1000 temperature sensors are approved for use with the
collector, it is equipped with 1.5meter silicon cable and suitable for all weather conditions, the
cable are temperature resistant up to 280
o
C, not necessary to distinguish the positive and
negative polarity of the sensor connection.
Only original factory equipped NTC10K,B=3950 temperature sensors are approved for use
with tank and pipe, it is equipped with 1.5meter PVC cable, and the cable are temperature
resistant up to 105
o
C, not necessary to distinguish the positive and negative polarity of the
sensor connection.
All sensor cables carry low voltage, and to avoid inductive effects, must not be laid close to
230 volt or 400 volt cables (minimum separation of 100mm)
If external inductive effects are existed, e.g. from heavy current cables, overhead train cables,
transformer substations, radio and television devices, amateur radio stations, microwave
devices etc, then the cables to the sensors must be adequately shielded.
Sensor cables may be extended to a maximum length of ca. 100 meter, when cable’s length
is up to 50m, and then 0.75mm
2
cable should be used. When cable’s length is up to 100m,
and then 1.5mm
2
cable should be used.
