IP Server 900 Hardware Installation Manual
External connections
H.1
External connections
Grounding instructions
System grounding (supplemental ground) is as follows:
• The conductor wires can be no smaller than the ungrounded branch-circuit supply conductors (usually AWG-
16 or higher gauge).
• Acceptable wire: bare
or
covered with green (or green-and-yellow-striped) jacket.
• Conductors (and power receptacles) shall connect to earth ground at the service equipment (usually a cold
water pipe or copper ground rod).
• The supplemental ground must: be used regardless of power cord ground, be connected to the ground lug on
the bottom of the cabinet, and retain ground connection when the power supply module is unplugged.
• Connect the grounding lugs of all units to system ground
Note:
IP Server 900 lines are protected against a 10 KV surge
only
if the earth ground procedures described
above are followed.
Power
The cabinet requires a 110 VAC outlet (if possible, a dedicated outlet). Use
only
the Class-2 power supply
module provided. A clean, isolated power source in conjunction with a UPS is
STRONGLY
recommended.
When fully loaded, the IP Server 900 consumes 80 watts.
If AC power is interrupted, the system will drop all connections. When power is restored, the system will resume
normal operation in approximately five minutes, having retained its full programming and clock setting.
UPS
For system protection and to maintain uninterrupted operation, an uninterruptible power supply is
STRONGLY
recommended. ESI recommends a UPS minimum rating of 230 VA
per system
.
Refer to the particular UPS unit’s specifications to determine expected backup duration during a power outage.
Note:
The following information about UPSs comes from
Technical Update
#216.
Most people have heard about UPSs, but seem to think that there is just one kind of device that goes by that
name. In fact, there are several different major designs in use by today’s major UPS manufacturers. These
makers share much of the blame for confusing UPSs’ end users by, far too often, lumping different designs
under the “UPS” name.
UPSs can first be broken down into
system types
:
•
Stand-by
— A very simple design that affects power only when either a lag/brownout occurs below, or a
spike/surge occurs above, a certain threshold. When either occurs, the unit trips —
i.e
., goes into
battery mode. This "cleans" the voltage and helps to keep any load safe. Industry average "trip"
times are 2–8 ms. No other filtration of AC power is performed.
•
Line interactive
— Constantly monitors inbound voltages, and uses special circuitry to boost low voltages
and clamp high voltages without having to use the batteries. Indeed, the batteries are used only if the
input voltage drops below acceptable levels (typically about 12% below normal), goes out completely
or rises to dangerous levels (typically about 14% above normal) at which components will be
damaged if line voltage is not removed. Industry average transfer time is 1–3 ms. (If voltage stays
within its normal window, this unit continues to pass voltage, unaltered, from the wall.)
•
On-line
(or
full on-line
) — Constantly filters the power and performs a function known as double
conversion (AC to DC to AC). This assures that the load — in this case, phone equipment — will
receive not only uninterrupted, true sine wave output but also the cleanest, steadiest power possible
throughout any foreseeable power disruptions or voltage irregularities. According to industry specs, it
is not unusual for these types of units to be able to regulate utility power, even when it drops to 27%
below or rises to 33% above normal, all without using their batteries.