Battery System Grounding; Ground Connections Check; Power Supply Connections; -48 Vdc Input Power And Backup Battery Charging Connections - Motorola DIMETRA MTS 2 Installation, Configuration And Basic Service Manual

Battery System Grounding

Procedure 4-4 How to Provide Grounding Connection to the Equipment Cabinet (Continued)
Using the M10 bolt provided, secure the cabinet ground wire to the M10 nut located on the
4
junction panel.
Ground connections should be checked after installation. Please refer to
5
for information about the torque.
Battery System Grounding
Ground the battery cabinet (if used) in accordance with manufacturer's instructions
and any applicable local regulations.

Ground Connections Check

Perform the following procedure to ensure adequacy of cabinet-to-facility ground (earth) connections.
Procedure 4-5 How to Ensure Adequacy of Cabinet – to – Facility Ground Connections
Install the earth cable between the building earth and the earth point on the MTS cabinet.
1
With a Milliohmmeter, check that the earth connection between the MTS Cabinet and the
2
building earth in the room is < 0.1 Ω.

Power Supply Connections

One of the following power supply connections is required for the MTS:
•
•
–48 VDC Input Power and Backup Battery Charging Connections
The –48 VDC connectors are used for:
•
•
4-20
DC in/out – within -41 VDC to -60 VDC – for MTS 4 two connectors are available
AC in – within 110 VAC to 240 VAC (nominal values) – for MTS 4 two connectors are available
Supplying the MTS with power in the DC only mode – in DC only mode the MTS
takes the power from a separate –48 VDC facility power system
For charging backup batteries in the AC mode
An external disconnect device is required on the DC power supply line.
Chapter 4: Hardware Installation
"Recommended Torque"
6802800U74-N September 2009