KVH Industries TracVision HD11, Installation Manual

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11
AC Power Requirements
The TracVision 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
TracVision 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 in “Grounding Requirements” on
page 12.
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.
Continued
Plan the Belowdecks Installation
Figure 11 Power Requirements
TracVision Equipment
Ground
Neutral
N
100-240 VAC
Isolation Transformer
50-120 VAC
50-120 VAC
Ground
Shipboard
Two-Phase,
Split-Phase,
or Delta Power
Single-Phase
Power Input
Ground Fault
Monitor
(when required)
Not Used
TracVision Equipment
Ground
50-120 VAC
Shipboard
Two-Phase,
Split-Phase,
or Delta Power
50-120 VAC
Leakage Current
TracVision Equipment
Shipboard
3-Wire
Single-Phase
AC Power
Ground
Neutral
N
100-240 VAC
OR
OR
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