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Nexus Knowledge Base Knowledge Base Articles

(Mounting, Power, Trigger Signals, Auto Formula Select, Manifold, Safety Switch)

Mounting the Unit

Step 1

Place the unit against the wall where you would like to install.
PLEASE NOTE – The unit should not be more than 2 metres from the chemical.

Step 2

Also confirm that the unit does not have any objects within the boundaries below.

Step 3

Once you have finalised the location for the unit, take a pencil or similar marker and place a dot on the wall through the top mounting hole.

Step 4

Take a 6mm drill bit and drill (not provided) and drill a hole approximately 30-35mm deep for the wall plug provided.

Step 5

Take the wall plug from the mounting kit provided and place into the drilled hole. If required, use a hammer or mallet (not provided) to drive flush.

Step 6

Take the M5 screw from the pack and use a screwdriver (not provided) to screw into the wall.
PLEASE NOTE – There must be at least 10 mm left outside of the wall for the unit to mount correctly.

Step 7

Take the Nexus unit and mount onto the screw via the top mounting hole. Do not screw this into a fixed position at this stage.

Step 8

Once mounted use the spirit level on the bottom of the enclosure to align the unit.

Step 9

Once straight, take your marker and place a dot inside the bottom mounting holes. Try to get them as central as possible to allow for adjustment.

Step 10

Remove the unit from the wall to reveal the drill marks.

Step 11

Drill two holes using the same 6mm drill bit as before (not provided).

Step 12

Insert the remaining two wall plugs (provided in the mounting kit) into the drilled holes. If required, use a hammer or mallet (not provided) to drive flush.

Step 13

Place the unit back onto the top mounting screw.

Step 14

Confirm that the unit is aligned correctly using the spirit level again.

Step 15

Finally, once you have confirmed the placement use a screwdriver to secure both bottom screws. You can now fully flush the top screw to complete.

Step 16

Your unit is now mounted to the wall and ready to wire.

Wiring the Power

Step 1

Remove the cover screws from the bottom of the main unit.

Step 2

Remove the front cover by sliding it up towards the ceiling.
PLEASE NOTE: The screen is attached to the cover with wires, so please take care not to damage these as you lift it up
Use the hooks at the top of the enclosure to hold the cover in place.

Step 3

Locate the wire inlets at the bottom of the enclosure. Unscrew either gland and push the cable up into the enclosure.

Step 4

Feed the cable through to the 3 way power connector located on the IOM board.

Step 5

Remove the 3 way green connector on the power supply connection. Place the 3 core mains wire rated 110-240 AC into the slot located on the IO board. You wire it in the following order if inserted from the left with the screws facing you.

Step 6

Place the 3 way connector into the power connector on the IOM board to complete.

Wiring the Trigger/Input Signals

If you are wiring trigger signals with a Common Neutral connections, please see this section – Common Neutral Wiring
If you are wiring trigger signals with Isolated Neutral connections, please see this section – Isolated Neutral Wiring

Common Neutral Wiring

Step 1

The Trigger Signals are located inside the unit on the right side board. If you are looking to wire Common Input trigger signals with a Common Neutral use the 2 way connector and 9 way A rail shown here.

Step 2

Wire the Common Neutral into the two way and connect your Trigger Connections into slots 1-8 in the 9 way connector as required.

Step 3

Place the Common Neutral connector back into the two way slot shown below.

Step 4

Connect any common trigger signals into the A rail as shown.

Step 5

Confirm that the Dip switches are in the BOTTOM position for the Common Neutral.

Isolated Neutral Wiring

Step 1

The Trigger Signals are located inside the unit on the right side board. If you are looking to wire Isolated Input trigger signals with a Isolated Neutral‘s use the 9 way A & B rail shown here.

Step 2

Wire both the A & B rail connectors with the trigger signal and corresponding isolated neutral connector, the trigger number and neutral highlight below. For example:
Trigger connector slot 1 neutral is slot 1 on the B rail.
Trigger connector slot 3 neutral is slot 3 on the B rail.

Step 3

Place the Isolated Neutral connector back into the two way slot shown below.

Step 4

Connect any Isolated trigger signals into the A rail as shown.

Step 5

Confirm that any Isolated Neutral connections have the Dip Switches in the TOP position.

Auto Formula Select – Timed Mode Setup

Step 1

The 9th input on the A rail connector is for the Auto Formula Select.

Step 2

Wire the Auto Formula Select into the 9th connector slot. Then use either the Common or Isolated neutral wiring as setup with the Trigger Signals earlier.
Common Neutral Wiring
Isolated Neutral Wiring

Step 3

If you do not have a Formula Select Module, you can use this Auto Formula Select to set up either TIMED or BINARY signals. For TIMED the length of the signal sent from this input will denote the program number. PLEASE NOTE – This relies on the MULTIPLIER set in the program settings.
E.G (With a multiplier of 1)
1 second = Program 1
2 seconds = Program 2

(With a multiplier of 2)
2 seconds = Program 1
4 seconds = Program 2
To change the multiplier settings please see the following section – Auto Formula Select Settings.

Once the program is locked in, the program number will appear in the top right of the unit screen.

Auto Formula Select – Binary Mode Setup

Step 1

For BINARY mode you first apply the MODE signal, then you have the SET UP TIME in section (Auto Formula Select Settings). To activate the program you will need to put the correlating binary code with the correct trigger. These are shown below. They go left to right trigger 1-8.
For example:
Program 7 = Input 1 + Input 2 + Input 3

Step 2

Please see the binary program list below.

PROGRAM 110000
PROGRAM 201000
PROGRAM 311000
PROGRAM 400100
PROGRAM 510100
PROGRAM 601100
PROGRAM 711100
PROGRAM 800010
PROGRAM 910010
PROGRAM 1010010
PROGRAM 1111010
PROGRAM 1200110
PROGRAM 1310110
PROGRAM 1401110
PROGRAM 1511110
PROGRAM 1600001
PROGRAM 1710001
PROGRAM 1801001
PROGRAM 1911001
PROGRAM 2000101
PROGRAM 2110101
PROGRAM 2201101
PROGRAM 2311101
PROGRAM 2400011
PROGRAM 2510011
PROGRAM 2601011
PROGRAM 2711011
PROGRAM 2800111
PROGRAM 2910111
PROGRAM 3001111
Binary Program List

Step 3

Below is an example of the AFS signal coming into the unit, with a trigger signal being applied to select Program 1.

Wiring the Manifold & Safety Switch

Step 1

The manifold connectors are located inside the main unit, on the main PCB here.

Step 2

The wiring for the connector is as below. The top connector is for the Manifold with Neutral and 24V DC inputs. The second input connector is for the Safety Switch with Neutral and 24V DC inputs.

Step 3

Insert the connectors into the slots provided. The Manifold at the top and the Safety Switch below, as shown.

Step 4

Lastly, in order to activate a manifold you will need to remove the relevant jumper. They are located to the left of the manifold connector.

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