Knowledge Base › Wiring guide: LiftMaster LA400

Wiring guide: LiftMaster LA400

This guide shows where each wire from the Nimbio terminal strip lands on the LiftMaster LA400’s main control board. Gate Status: needs the expansion board. This guide wires the open command and power only, so the Nimbio app does not show whether this gate is open or closed with this wiring.

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Note: This operator cannot supply enough continuous power for Nimbio. Use a separate 12–24V AC or DC power supply.

Before you start

Power the operator down at its supply before touching any terminal.
The Nimbio terminal strip has eight terminals: PWR+, PWR-, Sense 2, SC, Sense 1, NC, C and NO. This guide wires PWR+, PWR-, C and NO; the other four stay empty.
Power: PWR+ and PWR- go to a separate 12-24 V AC or DC power supply, not to the operator board. The board’s accessory output is rated 500 mA, but Nimbio installations powered from this board have had unstable power. The Nimbio board draws 40 to 70 mA.
You need a small screwdriver for the terminal screws.

Nimbio terminal strip (left) to the main control board (right). Wire tags name the destination terminal. On a phone, scroll the diagram sideways or pinch to zoom; the Connections list below has every wire.

Connections

Nimbio terminal	Operator terminal	Number	Board	Note
PWR+	Supply +	+	Separate power supply	Do not power from the operator board — see “Before you start.”
PWR-	Supply –	–	Separate power supply
Sense 2	Not used	—	—	Not used in this guide.
SC	Not used	—	—	Not used in this guide.
Sense 1	Not used	—	—	Not used in this guide.
NC	Not used	—	—	Not used: the operator input is wired to NO and C.
C	EXIT	—	LA400 main control board	Shares the Exit pair with NO.
NO	EXIT	—	LA400 main control board	Soft open command.

PWR+

Operator terminal: Supply +Number: +Board: Separate power supplyNote: Do not power from the operator board — see “Before you start.”

PWR-

Operator terminal: Supply –Number: –Board: Separate power supplyNote:

Sense 2

Operator terminal: Not usedNumber: —Board: —Note: Not used in this guide.

Sense 1

Operator terminal: Not usedNumber: —Board: —Note: Not used in this guide.

Operator terminal: Not usedNumber: —Board: —Note: Not used: the operator input is wired to NO and C.

Operator terminal: EXITNumber: —Board: LA400 main control boardNote: Shares the Exit pair with NO.

Operator terminal: EXITNumber: —Board: LA400 main control boardNote: Soft open command.

When the wiring is done, restore power at the supply. A Nimbio support team member then calls to test the gate before you close the panel.

Settings on the operator

No operator setting is changed by this guide.

Gate Status

Gate Status: needs the expansion board. The LA400 has an optional expansion board for additional inputs, but this guide does not wire the Nimbio sense lines to it, so the app does not report open or closed for this gate. If you need Gate Status on an LA400, contact Nimbio support before wiring.

Frequently asked questions

Does this guide give Gate Status on the LiftMaster LA400? +

No. This guide wires the open command and power only. The LA400 has an optional expansion board, but connecting the Nimbio sense lines to it is not covered here; contact Nimbio support if you need it.

Which Nimbio terminals open the gate on the LiftMaster LA400? +

NO and C, wired to the Exit input on the main control board. The Nimbio relay closes NO to C, which the LA400 reads as a soft open command.

Is the Nimbio NC terminal used on the LiftMaster LA400? +

No. The operator input takes the NO and C pair, so NC stays empty.