YX3000 Series Constant Pressure Water Supply One VFD Drives Four Pumps

1TB relay action indicates1# pump work at variable frequency 

1TG relay action indicates 1# pump work at 50/60HZ(fixed speed)

2TB relay action indicates 2# pump work at variable frequency

2TG relay action indicates 2# pump work at 50/60HZ (fixed speed)

3TB relay action indicates 3# pump work at variable frequency

3TG relay action indicates 3# pump work at 50/60HZ (fixed speed)

4TB relay action indicates 4# pump work at variable frequency

4TG relay action indicates 4# pump work at 50/60HZ (fixed speed)

Control board action principle:

1. Connect the pressure sensor to the control board, and set the parameters on the control board.

2. At the beginning of power-on, the control board detects whether the feedback pressure reaches the sleep pressure. If the feedback pressure is greater than or equal to the sleep pressure, the inverter enters the sleep state after a continuous sleep level.

3. If the feedback pressure is always less than the set pressure, VFD controls 1# water pump working at variable frequency. When the frequency of the VFD climbs to 50Hz, 1# water pump switches the relay state working at 50/60Hz (fixed speed), and the 2# water pump starts to work at variable frequency. After the frequency of the VFD climbs to 50Hz, 2# water pump switches the relay state working at 50/60Hz (fixed speed), and 3# water pump starts to work at variable frequency. When 3# water pump frequency climbs to 50Hz, 3# water pump switches the relay state working at 50/60Hz (fixed speed), 4# pump starts to work at variable frequency and has maintained this state since then.

4.  If four pumps are working at the same time, 1#, 2#, 3# pumps are working at power frequency, and 4# pumps work at variable frequency. If the feedback pressure is greater than the set pressure, 1# power frequency pump is stopped, 2# power frequency pump stop, 3# power frequency pump stop, working at variable frequency control 4# pump’s frequency gradually decreases until sleep.

5.  When the feedback pressure drops to the awakening pressure setting, the 4# water pump starts at variable frequency, the feedback pressure does not reach the set pressure, and the next round pump switching is entered. 4# pump switches to power frequency operation, 1# pump operating at variable frequency. The feedback pressure still does not reach the set pressure value, 1# pump switches to power frequency operation, 2# pump operating at variable frequency. Such a rotating switcher variable frequency or power frequency.

6. If four pumps always use one, in order to prevent the other three pumps from rusting for a long time, the VFD provides a timed rotation function.

When the feedback pressure is at a pressure that can be met by one pump water supply, the program will switch to the other three pumps through the timed rotation function;

If only two of the four pumps are used, the pumps will also be operated at rotation function. If only three of the four pumps are used, the pumps will also be operated at rotation function.

7. During the operation of the water supply system, if one of power frequency (fixed 50Hz) pumps has a large current for a long time, the thermal relay at the front end of the pump will act (assuming FR1 action) to cut off the 1# power frequency water pump. The contact corresponding to the thermal relay will send a signal to the X1 terminal of the VFD. After receiving the signal, the VFD will lock the 1TG relay to make it no longer action, and detect whether the remaining pumps are not working or not. If there are indeed other pumps that are not working, the VFD will control the unoperated water pump to enter the power frequency (fixed 50Hz) working state to ensure that the constant pressure water supply system continues to work; If the remaining pumps are in operation, the VFD will not have any action after receiving the signal from the thermal relay.

When the contact corresponding to the thermal relay returns to the original state, the effect is invalid (Lock 1TG relay no longer operates) and the VFD continues to operate normally.