KVH Industries TracNet H90, Руководство по установке

Страница: 20 / 44

TracNet H90 Installation Guide
18
Connect Power
Connect Power
Before you begin, be sure that you understand the
following important requirements:
AC Power Requirements
The TracNet system is designed to run on 3-wire single-
phase AC power (hot, neutral, and ground). Voltage
between hot-neutral and hot-ground should each measure
between 100-240 VAC.
Many large ships use two-phase, split-phase, or delta
power instead (3 wires: hot, hot, and ground; no neutral). In
this case, voltage between hot-hot measures the proper
voltage (100-240 VAC); while hot-ground measures only
half the voltage (50-120 VAC). Although the TracNet
system can operate on this type of power, the excess
voltage present on the second phase will cause a small
amount of current to leak onto ship's ground. This leakage
current might be unacceptable on some vessels. So check
with the customer or ship's electrician and get permission
before you run the system on two-phase power. Also be
sure to ground the system, as explained below.
If two-phase power is the only available power source
onboard, and if leakage current is unacceptable, KVH
recommends that you install a suitable isolation
transformer to supply single-phase power to the antenna
system and run a ground wire from the transformer to
ship's ground. In addition, since ground fault protection
devices cannot detect faults behind a transformer, you will
also need to install a ground fault monitoring device
between the isolation transformer and the antenna system
if ground fault protection is required on the vessel.
Grounding Requirements
Proper grounding of the TracNet system to ship's ground
is critically important, as it protects the equipment from
electrostatic discharges (ESD). Failure to ground the
chassis of the BDU risks damage to the antenna and
electric shock.
Figure 32: AC Power Options