Specifications for AC Fan Sensor

Technical Material

ACDC fan sensor specifications differ from those below..

Specifications of sensor circuit

	5 V (ITEM-20 ⁽¹⁾)	12 V (ITEM-30 ⁽¹⁾)
Example of model.no	109S405UL
System	Speed detection, Auto-restart, Open collector
Power supply	5 VDC±10% At 5 V, 6 mA	12 VDC±20% At 12 V, 10 mA
Recommend sensor circuit output	At Vp= 5 V, I= 100 mA max.	At Vp= 12 V, I = 200 mA max.
Trip point	Standard speed: 1700 min-1±10% Low speed: 850 min-1±10%
Response speed	Standard speed: Startup delay 18 s Detection delay 1 s Low speed: Startup delay 36 s Detection delay 2 s
Insulation resistance	10 MΩ min. at 500 VDC ⁽²⁾
Dielectric strength	50/60 Hz, 1000 VAC, 1 minute ⁽²⁾
Ambient conditions	Temperature: -10 to +70˚C , humidity: 90% RH max. (at 40˚C)

(1) [ITEM-20] and [ITEM-30] are printed on the fan nameplate.
(2) Between lead wire conductors and frame

Sensor output circuit

GND (Black) should be shared in case that power supply for sensor circuit (Brown) and that for sensor pull-up (Yellow) are separated.

* [ITEM-20] and [ITEM-30] are printed on the fan nameplate.

Sensor scheme

Example 1: When the AC power for the fan and the DC power for the sensor are turned on at the same time

Example 2: When the AC power for the fan is turned on first, then the DC power for sensor is powered on

Example 3: When the DC power for sensor is first powered on, then the AC power for the fan is turned on

Last updated: November 2025