Users Manual Part 1

3.7.2.2
AC and DC Current Load
WARNING: The MTS has a 2mA minimum power consumption even when the Power Supply
Unit (PSU) is switched off. The switch only disconnects DC outputs and charging currents. In
case of the field repair, disconnect all PSU connecting cables.
3.7.2.3
Backup Battery
The backup battery is normally located near the cabinet(s). The recommended batteries to be used are
a VRLA (Valve Regulated Lead Acid) recombination type, with -48 VDC nominal.
3.7.3
Surge Arrestors
For details on surge arrestors, see Surge Arrestors and Suppliers on page 488.
IMPORTANT: To transport lightning strikes away from the equipment, install the lightning
arrestors.
NOTICE: Install a lightning rod on a different tower leg than the antenna.
3.7.4
Power Panel
Use a standardized power panel including circuit breaker layout in all sites where an MTS is installed.
Leave vacant space to allow for future requirements.
3.8
User Alarms, Control Outputs, and Door Alarm
The MTS in all configurations has the following alarm inputs and control outputs:
• 15 x 12 V opto-isolated alarm inputs: Available on the junction panel. Alarm inputs and Alarm
ground are floating.
• D60_MTS2and4_MidpowerPA_CLE6165A_A
• 2 x Form A relay outputs with Common and Normally Open contacts: Available on the junction
panel.
•
DOOR alarm: Connected to the Site Controller
NOTICE:
All 15 alarm inputs and Door alarm use the same Alarm Ground. All these alarms and controls
connect directly to the Site Controller (SC).
The Expansion Cabinet only offers the Door alarm feature.
For detailed information, see External Alarm Cabling on page 151 and User Alarms/Controls,
X.21, RGPS, and GPS Cabling on page 170
.
The following figure shows detailed User Alarms input structure.
6802800U74-AP
Chapter 3: Site Preparation
87