SR971,SR972 Solar station operation manual
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8.Protection function
8.1 Memory protection
In case power failure occurs, controller keeps the parameter settings unchanged.
8.2 Screen protection
When no any press on button for 3 minutes, screen protection is activated automatically, and
then LCD lighting lamp is switched-off. Through press any button to light LCD lamp again.
9. Trouble shooting
9.1 Trouble protection
a
. When there is a break or short circuit between the connection of temperature sensors,
controller switches off the corresponding functions and corresponding output signals, at the
same time error signals are showed on the display. If control unit does not work
correctly, please check following points.
►Press “ ” button to check error code, “ “signal displays on the LCD
screen
Error message on
LCD screen
Meaning
Cause of error
Error rectification
T1 - -
T1 sensor problem
Sensor open or short
Check resistance
value, replace
T2 - -
T2 sensor problem
Sensor open or short
Check resistance
value, replace
T4 - -
T4 sensor problem
Sensor open or short
Check resistance
value, replace
T5 - -
T5 sensor problem
Sensor open or short
Check resistance
value, replace
T6 - -
T6 sensor problem
Sensor open or short
Check resistance
value, replace
