Figure 4-16 -48 Vdc Connection On The Mts 2 Junction Panel - Motorola DIMETRA MTS 2 Installation, Configuration And Basic Service Manual

MTS 2 and MTS 4 Installation, Configuration and Basic Service Manual
Figure 4-16 –48 VDC Connection on the MTS 2 Junction Panel
6802800U74-N September 2009
If the DC input on the station is connected to backup batteries, an external Low
Voltage Disconnect (LVD) device should be introduced directly in the power line
in order to protect the batteries against deep discharge. On the MTS2, one relay
rated min. 20A/55 VDC should be introduced. And for the MTS4, two of these
units should be used, one for each of the two incoming DC lines. Alternatively
for the MTS4, one relay rated 40A/55 VDC can be used if the two DC lines are
connected to one battery pack. The relays should be controlled in a way that they
disconnect the batteries once the voltage drops below 40.5 V, where the PSU in
the MTS shuts down. Two Motorola kits are available for this purpose:
• MTS2 LVD RELAY RETROFIT KIT (Kit Number: GMDN2206A)
• MTS4 LVD RELAY RETROFIT KIT (Kit Number: GMDN2207A)
Figure 4-16 and Figure 4-17
There may be small differences in older configurations.
–48 VDC Input Power and Backup Battery Charging Connections
depicts the newer version of the MTS Junction Panel.
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