Service Manual

GSM-205-423
Connecting input power
31st Oct 01
Installation & Configuration: Horizon macro indoor
68P02902W08-B
CONTROLLED INTRODUCTION
Inst. 2–59
Connecting input power
Pre-connection
checks
At this point in the installation, ensure that:
 The cabinet is not already connected to the main ac or dc power source.
 The cabinet is connected to the ac or dc power cabling.
Connecting dc
power
To connect dc power to a cabinet:
WARNING
Do not wear an anti static wrist strap while servicing the
power supplies or power distribution cabling, as serious
personal injury can result. The external converter
supplying the cabinet must have double or reinforced
insulation between its primary and secondary circuits, and
must conform to Safety Standard EN 60950.
CAUTION Perform any adjustments recommended by the
manufacturer on the main power supply equipment before
connecting dc power cables to the main dc power source.
Input to the base station must remain between 20 V and
30 V under all load conditions for normal +27 V dc
operation.
Input to the base station must remain between –40 V and
–60 V dc for –48 V dc operation.
1. Turn off the main dc power supply.
2. Use a digital voltmeter to ensure that power is not present.
3. Route and secure the dc power and earth cables to the building ac power
supply from the cabinet.
4. Connect the earth wire to the building master earth.
5. Connect the 0 volt lead of the input dc power cable to the 0 volt terminal of
the main dc power supply. See Installing and connecting power and
earth cabling.
6. Connect the V IN lead of the input dc power cable to the V IN (+ 27 or
–48/60 volt, as appropriate for cabinet PSM type) terminal of the main dc
power supply. See Installing and connecting power and earth cabling.
7. Tighten connections to correct torque (see Site specific or electricity
supply company documentation).