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Before you begin, be sure that you understand
the following important requirements:
AC Power Requirements
The TracPhone 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 TracPhone
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 (see 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 TracPhone system to
ship's ground is critically important, as it protects
the equipment from lightning and electrostatic
discharges (ESD). Failure to ground both the
chassis of the ICM and the antenna’s AC power
cable to the ship’s common ground risks damage
to the antenna and electric shock.
TracPhone Equipment
Ground
Neutral
100-240 VAC
Ground Fault
Monitor
(when required)
TracPhone Equipment
Ground
50-120 VAC
Shipboard
Two-Phase,
Split-Phase,
or Delta Power
50-120 VAC
Leakage Current
TracPhone Equipment
Shipboard
3-Wire
Single-Phase
AC Power
Ground
Neutral
N
100-240 VAC
OR
OR
Single-Phase
Power Input
Isolation Transformer
Ground
Ground
50-120 VAC
50-120 VAC
Shipboard
Two-Phase,
Split-Phase,
or Delta Power
N
Figure 45: AC Power Options
Connect Power
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