Product overview
5
EM-TRF · EM-TRF-USV Operating and Installation Manual / Leaflet no. M375EV5 (
8/2018
)
Product overview and functional description
Micro fuse
F 500 mA T, 250 V
Terminal block for supply voltage
PCB connection plug
3 Product description
Functional description
Once the expansion module has been connected
to the 230 V AC supply voltage (mains voltage), the
transformer reduces this voltage to 24 V AC to be
supplied to the controller and its modules. An LED
indicates whether voltage is being supplied.
Additional function of the EM-TRF-USV
If the supply voltage (mains voltage) fails, the
battery pack takes over and supplies voltage to
the controller and any connected components.
The alarm function is always maintained; if the
emergency voltage supply covers also the air
conditioning system, that function is also
maintained.
EM-TRF
EM-TRF-USV
L N PE
L N PE
Operating state indicator light
Socket for battery pack
Battery pack