delayed update...
Problem: The Water Pump Motor cannot stop in Auto mode.
The Water control system has 2 mode. Manual and Auto.
1) Manual mode: where manually we have to switch ON the water pump motor to send water to the roof top tanks and manually OFF the water pump motor to stop the water to the roof top tank.
2) Auto mode, where the water pump is control by the sensors in the Main Tank A. If the water level drops below the "low level" sensor, control system will ON the water pump motor. When the water level reach the "high level" sensor in the tank, the control system will OFF the water pump motor.
The Tukang Paip was unable to solve the problem. The Tukang Paip consulted another contractor to help them solve the problem, but the other contractor wanted to charge RM6000 for rectifying the problem. It was too expansive, so Mr.Sahfi and myself decided to hold on the repair work until a solution was found. Until then we decide to operate manually... meaning i have to ON the water pump to supply water to the roof tanks whenever the water runs low.
Fortunately, the electrical schematic diagram for the control system was available. Electrician Abu gave me the schematic diagram. Abu also was not able to understand the circuit. Spend few days reading and understanding the water control system from the schematic diagram. Finally i was able to located the root cause of the problem which happen to be a short circuit at the input to the water level sensor amplifier A1, causing the water pump motor to always ON when switch to Auto mode.
After rectifying the level sensor system, the Auto Mode was checked and was confirm working. In the Auto mode, when the water reach high level sensor the water pump motor was automatically stops and restarts back when the water level drops below the low level sensor.
The Water control system has 2 mode. Manual and Auto.
1) Manual mode: where manually we have to switch ON the water pump motor to send water to the roof top tanks and manually OFF the water pump motor to stop the water to the roof top tank.
2) Auto mode, where the water pump is control by the sensors in the Main Tank A. If the water level drops below the "low level" sensor, control system will ON the water pump motor. When the water level reach the "high level" sensor in the tank, the control system will OFF the water pump motor.
The Tukang Paip was unable to solve the problem. The Tukang Paip consulted another contractor to help them solve the problem, but the other contractor wanted to charge RM6000 for rectifying the problem. It was too expansive, so Mr.Sahfi and myself decided to hold on the repair work until a solution was found. Until then we decide to operate manually... meaning i have to ON the water pump to supply water to the roof tanks whenever the water runs low.
Fortunately, the electrical schematic diagram for the control system was available. Electrician Abu gave me the schematic diagram. Abu also was not able to understand the circuit. Spend few days reading and understanding the water control system from the schematic diagram. Finally i was able to located the root cause of the problem which happen to be a short circuit at the input to the water level sensor amplifier A1, causing the water pump motor to always ON when switch to Auto mode.
After rectifying the level sensor system, the Auto Mode was checked and was confirm working. In the Auto mode, when the water reach high level sensor the water pump motor was automatically stops and restarts back when the water level drops below the low level sensor.
This is the Water control system's electrical and electronic components. This control system is stationed in the water tank room at ground floor.
The test pen points to the sensor emplifier known as floatless sensor amplifier. The signal to this emplifier was short circuit causing the water pump to always ON when put in Auto mode.
