Why does the unit activate during the daytime on a 754HB2/180/60 PIR motion detector



The level of ambient light in the area may be too dark for the current DUSK setting.  During daylight, adjust the lux control slightly anticlockwise.
When the lamp extinguishes, enter the detection area.  If the PIR still activates, the setting is still too high.  Repeat the above procedure until the PIR
does not activate when you enter the detection area.