Twin-head pump

Twin-head pump connection interrupted. What could have caused this?

The warning (H571) indicates that the twin-head pump connection has been interrupted. This is often the case if both pump heads have not been connected to the power supply.

Can a twin-head pump also be operated like two single pumps and be controlled by an external switchgear or BMS?

Yes, it is possible.
To do this, disconnect the twin-head pump connection (see the section “Two single pumps as a two-pump system in Y-piece joint”) and replace the LED display on the right-hand pump drive with a graphic display.
The graphic display is available as a spare part. All settings on the second pump drive can then be configured using the second graphic display.