Okada
Banned
Hi
I am designing a PIC16F887 based Submersible pump starter. Actually I am reverse engineering a product. The original product used Renesas microcontroller. It has two PCBs, one main controller board and another relay board. It also has two capacitors and on one it is mentioned start capacitor and I think the other is run capacitor.
Capacitors
36 MFD 440V AC
START = 120-150 MFD 440V
The starter has one 12V 750 mA Transformer, a bridge rectifier, a 7805 based circuit and a 3 digit seven segment display, 3 tact buttons (SET/RUN, INC/OFF, DEC/ON), one rocker for auto/manual modes selection. It has a connector and the connections mentioned are
L, N, R, Y, B
L and N are Line and Neutral inputs to Panel.
RYB connects to pump.
I have reverse engineered the controller board and have added additional functionalities.
The original board has a current transformer which is used for auto current calibration
Now the problem is with Relay board. Till now I had not seen the back side of the relay board.
The relay has both quick connect terminals and PCB mount terminals. it is a 240V 30A contact relay. The line (L) goes to relay and comes out of relay. So, it is a SPST relay.
There is a 4 Way Termianl block on the relay board and the 4 wires of the capacitors connect to the terminal block.
On the relay board there is a MOC3021 fairchild make and two TRIACs ( I guess )at the back of the relay board, I guess because MOC3021 is on the relay board.
Now can anybody explain the connections of the capacitors ?
My client says that there is soft start option that is if ON button is pressed for 3 seconds then after 3 seconds expires then pump starts.
Is this a capacitor start and run motor ?
I found that the 2 middle pins of the 4-Way terminal block on the relay board is shorted and connected to Y terminal of RYB connector.
The line goes to relay and comes out of the relay quick connect terminal and goes to R connector of the RYB connector.
The B connector of the RYB connector goes to neutral and CT reads the current from neutral.
There is a 1/2W resistor between Yand B terninals of the RYB connector.
Can somebody explain the connections of the relay board with 2x TRIACs in detail with a diagram ?
I am designing a PIC16F887 based Submersible pump starter. Actually I am reverse engineering a product. The original product used Renesas microcontroller. It has two PCBs, one main controller board and another relay board. It also has two capacitors and on one it is mentioned start capacitor and I think the other is run capacitor.
Capacitors
36 MFD 440V AC
START = 120-150 MFD 440V
The starter has one 12V 750 mA Transformer, a bridge rectifier, a 7805 based circuit and a 3 digit seven segment display, 3 tact buttons (SET/RUN, INC/OFF, DEC/ON), one rocker for auto/manual modes selection. It has a connector and the connections mentioned are
L, N, R, Y, B
L and N are Line and Neutral inputs to Panel.
RYB connects to pump.
I have reverse engineered the controller board and have added additional functionalities.
The original board has a current transformer which is used for auto current calibration
Now the problem is with Relay board. Till now I had not seen the back side of the relay board.
The relay has both quick connect terminals and PCB mount terminals. it is a 240V 30A contact relay. The line (L) goes to relay and comes out of relay. So, it is a SPST relay.
There is a 4 Way Termianl block on the relay board and the 4 wires of the capacitors connect to the terminal block.
On the relay board there is a MOC3021 fairchild make and two TRIACs ( I guess )at the back of the relay board, I guess because MOC3021 is on the relay board.
Now can anybody explain the connections of the capacitors ?
My client says that there is soft start option that is if ON button is pressed for 3 seconds then after 3 seconds expires then pump starts.
Is this a capacitor start and run motor ?
I found that the 2 middle pins of the 4-Way terminal block on the relay board is shorted and connected to Y terminal of RYB connector.
The line goes to relay and comes out of the relay quick connect terminal and goes to R connector of the RYB connector.
The B connector of the RYB connector goes to neutral and CT reads the current from neutral.
There is a 1/2W resistor between Yand B terninals of the RYB connector.
Can somebody explain the connections of the relay board with 2x TRIACs in detail with a diagram ?