Belimo LM230A-S actuator Wire Mapping

The Belimo LM230A-S damper actuator uses two separate integrated cables: one for the main AC power/control input and one for the internal auxiliary switch.

Below is the complete wire color mapping and connection diagram based on the official Belimo Technical Datasheet. 

1. Power Supply & Control Cable 

This cable provides the mains voltage power (AC 100…240 V) to operate the motor. 

• Blue Wire (N): Connected to the Neutral line.
• Brown Wire (L): Connected to the Line/Hot wire for primary direction or power.
• White Wire : Connected to the Line/Hot control signal line. 

2. Auxiliary Switch Cable 

This cable links to an integrated Single-Pole Double-Throw (SPDT) auxiliary contact used for signaling the position of the damper back to a controller or automated system.

• Violet Wire : Common (COM) point for the switch.
• Red Wire : Normally Closed (NC) contact.
• White Wire : Normally Open (NO) contact. 

(Note 1: The internal switch can be manually adjusted via the orange rotary knob on the front face of the actuator to trigger anywhere between 0% and 100% of the rotation stroke.

Note 2: A Single Pole Double Throw (SPDT) switch is an electrical switch that routes one input signal to one of two separate outputs. It acts like a changeover switch, connecting a single common terminal to either terminal A or terminal B, but never both at the same time.)

Difference between LM230A-S and LM230ASR

The Belimo LM230ASR actuator uses a completely different control mechanism and wire mapping compared to the LM230A-S. While the LM230A-S is a digital open/close or 3-point floating actuator with a built-in auxiliary switch, the LM230ASR is a modulating (proportional) actuator that is controlled via a DC voltage signal and lacks the integrated auxiliary switch. 

The mapping differences based on the official Belimo Technical Datasheets break down as follows:

Cable Layout Comparison

• LM230A-S: Uses two separate 3-wire cables (one for power/control, one for auxiliary switches).
• LM230ASR: Uses one 2-wire power cable and one 4-wire control/feedback signal cable. 

Structural Wire Mapping Differences

Terminal / Feature	LM230A-S (Open/Close & Floating)	LM230ASR (Modulating 2…10 V)
Control Signal Type	Line Voltage Switched (AC 100…240 V)	Proportional Low-Voltage (DC 2…10 V)
Power Supply (N)	Blue Wire (Neutral)	Blue Wire (Neutral)
Power Supply (L)	Brown Wire (Line/Hot)	Brown Wire (Line/Hot)
Signal Input (Y)	White Wire (Line voltage control input)	White Wire (DC 2…10 V command signal)
Position Feedback (U)	Not available	Orange Wire (DC 2…10 V feedback output)
Auxiliary Reference	Not available	Red Wire (DC 24 V, max 10 mA auxiliary supply)
Reference Common	Not available	Grey Wire (Signal reference ground / Neutral)
Auxiliary Switch Wiring	Violet, Red, White	None (No integrated switch on standard ASR)

Key Operational Differences

• Modulating Input (Y): On the LM230ASR, the white wire takes a precision DC 2…10 V control signal from a programmable controller instead of a raw line-voltage power feed. The voltage value dictates the exact degree angle of the damper blade (e.g., 2 V is fully closed, 6 V is 50% open, and 10 V is fully open). 
• Position Feedback Output (U): The LM230ASR transmits an analog position signal back to the automation network via its Orange Wire. This lets the Building Management System (BMS) monitor the real-time physical angle of the damper. 
• Internal Auxiliary Voltage: The LM230ASR includes a specialized Red
   Wire that outputs a small DC 24 V auxiliary current. This is typically used to drive simple external positioners or low-power field sensors directly from the actuator.