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8. TROUBLESHOOTING
ENGLISH
How to act for problems
Valve sensor problem
Valve sensor
Valve sensor
Release valve sensor connection from the relay board. After converting the tester to the resistance measurement
mode, measure resistance between a and b. There should be a certain resistance value.
Also after converting the valve to manual operation, move the valve. There should be a movement in the valve sensor
and a change in resistance value.
If although the valve sensor is moved, yet there is no change of resistance value, wiring is wrong or valve sensor is
damaged.
During the time that valve is fully opened from the fully closed status, if the resistance between a and b increases
uniformly and resistance between b and c of the valve sensor decreases uniformly, then the valve sensor is normal.
Also when the resistances between a, b, c, and main body are measured, it should not form an angled line.
If the valve sensor is normal, re-connect the sensor, completely close the valve, and check whether the valve value is
0%, and after completely opened, 100%.
If the value was changed and the valve opening % is wrong, the sensor needs to be set again.
If there is no change in the value, check whether 100% is set in ‘sensor setting-guide valve setting” item, and check
whether the sensor value for A/D value changes when the valve is moved.
If the sensor value was changed, conduct the valve setting again. If sensor value does not change, convert tester to
DC voltage 30V measuring position, and when the voltage is measured with + at the point where valve sensor a is
connected, and – at the point where valve sensor c is connected, the measured value should be DC 5V.
If the voltage is not correct, check relay board main input power.
If relay main power is normal, valve sensor is normal, and sensor value does not change, replace relay board.
Summary of Contents for LCWW
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