2.5.2 Power connectors and power supplies
Power connectors
At first, connect the screw, labelled with "GND" to Ground (e.g. to the 19"-Rack the chassis is
mounted in).
After that connect the chassis to 90-240V A/C via IEC connectors. Use power cords with an
earthing contact and protective earth connection only! The sat-nms LFTXRX is working with only
one connected power supply as well, but we strongly recommend to use two different power
supplies to ensure the maximum system availability. In case of one power supply breaking down,
the system will still be working without interrupt.
Power supplies
The sat-nms LFTXRX frame is equipped with hot-swap power supply, Therefore the power
supplies can be changed during the sat-nms LFTXRX frame is in operation. To change a power
supply, always disconnect the mains of the power supply that has to be changed and wait at least
10s (for internal discharge). Open the 2 screws with which the power supply is mounted an pull
the power supply, using the attached handle bar, out of the unit.
To put in a power supply, you have to do the same things in reverse chronology: Put the power
supply into the slide rails, until the front plate contacts the mounting rail. After that fix the power
supply with the provided screws to ensure a proper contacting of the connectors on the power
supply with the connectors on the backplane.
ATTENTION: To avoid the possibility of an electrical shock, never handle with a power supply that
is connected to mains!
The Alarm and data connectors of the sat-nms LFTXRX chassis all are located at the front side of
the enclosure. The figure below illustrates the location of the connectors and the pin out.
To meet mentioned EMC standards, use double shielded twisted pair CAT7 S/FTP Network cable,
e.g. DRAKA UC900 SS27 Cat.7 PUR, for connecting network, serial and alarm interfaces. Ensure
that the shield is connected properly.
The LED PS/Alm shows the presence of one or two power supply(ies) and the Alarm state of the
Unit. The LNK/Traffic LED turns on, when there is some traffic on the LAN, the chassis is
connected to.
To release the MNC board, open the screws with which the card is fixed at the mounting rail. Now
turn in the screw into the screw thread beside to push the card out of its socket. After that you
can pull the card out of the unit.
To install the MNC board again, put it into the slide rail until the front plate of the card contacts the
mounting rail. Please pay attention: The board has to slide in smoothly. If not, pull the card out
and try again. Otherwise the connectors on the MNC board or on the backplane might be
damaged. After that fix the card with the provided screws to ensure a proper contacting of the
connectors on the MNC board with the connectors on the backplane.
(C) 2021, SatService GmbH
www.satnms.com
LF20-UM-2107 Page 12/43
