ESI IVX C-Class Installation Manual page 13

IVX C-Class with voice mail: Installation Manual
Grounding instructions
System grounding (supplemental ground) is as follows:
• The conductor wires can be no smaller than the ungrounded branch-circuit supply conductors
(usually 16-gauge or larger).
• 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 IVX cabinet, and retain ground connection when the IVX power
supply module is unplugged.
Note: IVX C-Class system lines are protected against a 10 KV surge only if the earth ground procedures
described above are followed.
Power
The system cabinet requires a 120 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 (see "UPS,"
below) is STRONGLY recommended. The system draws a maximum of 25 watts.
If AC power is interrupted, the system will drop all connections. When power is restored, the system
will resume normal operation in approximately one minute, having retained its full programming and
clock setting.
UPS
For system protection and to maintain uninterrupted operation, an uninterruptible power supply (UPS, or
"battery back-up") is STRONGLY recommended. A UPS rated for 200 VA will provide approximately
two hours of uninterrupted service for an IVX C-Class system.
Note: The remaining information under "UPS" 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
Hardware overview/installation
B.7