Mdf Cabling - Samsung OfficeServ500 Installation Manual

3-4 Chapter 3
Grounding and Power Connections
CONNECTING AN EXTERNAL 48VDC BATTERY SOURCE
CAUTION: To reduce risk of fire and injury, use only a sealed nickel-cadmium or lead-acid
battery supply capable of handling a charge current of 0.45 Amps, a charge voltage of -54
VDC and a discharge rate of 6–40 Amp Hours (AH).
The power supplies contain a monitoring circuit to switch the system to customer-provided 48VDC bat-
teries if AC power is interrupted. Calls in progress are not disconnected. The PSU-B/PSU60 provides
-56VDC at 0.4 amperes charging current (when AC power is supplied) which allows for float charging
from the system to the emergency backup batteries. There should be no more than a -0.5VDC drop in
voltage from the system and the batteries.
Take the following precautions when installing batteries:
• Make sure the batteries you install conform to local building, fire and safety codes. Some battery
types emit hydrogen gas during the charging state and may require venting to fresh air.
• Do not place batteries directly on a concrete floor. This causes them to discharge very quickly.
• Follow the battery manufacturer's recommended installation and maintenance procedures.
• Check polarity prior to connecting the external 48VDC power source to the system.
Connect four 12V batteries or eight 6V batteries in series. Use the factory-supplied wire harness with
91.5cm (36") white and black leads to connect batteries. The batteries must be located within one me-
tre of the KSU.
The 48VDC cable assembly has a male 3-pin mate and lock connector on the system end. Insert this
end of the DC cable into the battery (BATT) connector on the left-hand side of the cabinet. Attach the
other end of the DC power cable to the 48VDC power source.
WARNING: Make sure the proper polarity is observed. Equipment damage will result
if polarity is reversed. Do not connect external power to the system.
Press the "BATT" switch located above the card slots (next to the main power switch marked "PWR")
to the ON position. (See

MDF Cabling

All connections to the system are made by way of a customer-provided main distribution frame (MDF).
Each interface card, with the exception of the TEPRI and MGI card, is connected to the MDF using a
25-pair female amphenol-type cable (see below). These cables can be routed into the cabinet(s) from
below or on the right-hand side.
Label each cable to correspond with the slot numbers. Label each terminating block to identify the
cabinet, slot and port numbers. Use one pair twisted jumper wire to cross-connect stations or lines to
their associated port.
Figure 4-2 in Chapter 4 which shows the position of the switch.)
(Figure 3-4.)