Beijer Electronics QTERM®-A12 - Manual (Page 17)

Hardware Description and Architecture Power Supply
QTERM-A12 Terminal 11
4.7 Power Supply
The QTERM-A12 has a 10- to 32-volt DC input range and can be powered directly from a 12-
or 24-volt DC power supply. The terminal includes circuitry to protect against normal varia-
tions such as transients and spikes (EN55024 compliant), as well as reverse voltage and over-
voltage protection.
Power is applied through a 3-terminal strip with removable plug located on the back of the
unit. The 3-terminal strip has a power connection, ground and chassis ground (isolated from
the system). Alternatively, power may be applied through pin 9 of the COM1 DB9. In this
case, pin 5 is the power ground return.
If equipped with optional Power-over-Ethernet (PoE) the QTERM-A12 will operate from
power supplied over an Ethernet cable. For details about the PoE interface, refer to
section 3.4,
“Optional Power-over-Ethernet Interface” .
4.8 Housing
The QTERM-A12 housing is made of industrial grade polymer that is designed to withstand
everyday use in industrial environments.
Refer to Chapter 5, “Installation” for instructions on installing the unit in a panel.
C AUTION
For Class I, Division 2 installations:
Do not connect or disconnect cables while power is applied unless the area is known to be
non-hazardous.