FlexVander NX 910 installation

Use this page when installing or servicing a supported FlexVander NX 910 controller.

Installation choices

The NX 910 installation uses the same FlexVander pump programs as the current VX90 range. Select the program before wiring the pump panel.

• FlexVander program 1 is used for two pressure pumps without a submersible pump.
• FlexVander program 2 is used for one submersible pump and two pressure pumps.
• Use FVAPRG to select the active FlexVander program.

Basic installation

Separate the installation into the following cable groups:

1. Controller supply and protective earth.
2. Pump start and stop commands from the relay outputs.
3. Pump operating feedback and local push buttons on the digital inputs.
4. Pressure transmitter, energy meter, and sensor wiring when the installation uses these options.

Installation sequence

1. Mount the controller and identify the installed supply type before energising the cabinet.
2. Wire the supply according to Supply voltage.
3. Wire the pump commands and feedback for program 1 or program 2.
4. Wire local push buttons only when the installation is configured to use FVALOCIN.
5. Wire the pressure transmitter and set the analog input jumper when pressure control is used.
6. Wire RS485 equipment and set termination only when the controller is an endpoint on the bus.
7. Verify the FlexVander program, pulse time, contact mode, and pressure settings before handover.

Supply cable

The NX 910 can be supplied from 100-260 VAC and 8-36 VDC. AC and DC supply can be connected at the same time when the cabinet design requires dual supply.

• For AC supply, connect phase, neutral, and protective earth to the AC supply terminals shown in the IO list.
• For DC supply, connect positive to DCIN and negative to XGND.
• Keep power ground, signal ground, and analog ground separated as shown in the controller terminal reference.

Signal cable

FlexVander uses the relay outputs for pump commands and the digital inputs for operating feedback. The relay outputs are potential-free normally-open contacts. Pulse time is set with FVADOUTT#, and stop contact behaviour can be changed with DWCONTACT# where supported by the installation.

• Use Program 1 wiring for pressure pump 1 and pressure pump 2.
• Use Program 2 wiring for submersible pump, pressure pump 1, and pressure pump 2.
• Use Local push buttons only together with the matching FVALOCIN setting.

Pressure control

When pressure control is installed, connect the pressure transmitter to the analog input listed in Pressure control. Configure the analog input for the transmitter signal type before commissioning.

Use FVAPRESS, FVAPTRMODE, and FVAPRESSDELAY1/2 for the FlexVander pressure functions.

Energy consumption registration

When an RS485 energy meter is installed, connect it to the RS485 port selected for the project and terminate the RS485 line only at the two physical endpoints. See the energy metering section for the terminal reference.

Mini weather station

Connect supported weather and level sensors through the available analog, 1-Wire, or RS485 interface according to the sensor type. Use the mini weather station section as the controller-side terminal reference.

Before handover

1. Check that the pump program in FVAPRG matches the wired pump layout.
2. Check each command output from the FlexVander status and IO views.
3. Check each pump operating feedback input before automatic operation is enabled.
4. Check local push buttons, pressure readings, energy readings, and weather station values when installed.
5. Record any jumper changes in the cabinet documentation.

IO list

Use the FlexVander NX-910 IO list for exact terminals, jumper decisions, and interface notes.