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2.3.1 Fusing Requirements
If compliance with IEC 61010 is required, install an external bipolar circuit breaker or
switch near the clock so that both current-carrying conductors of the power supply are
interrupted. DO NOT interrupt the protective ground conductor.
The use of a 10A, category C, IEC 60947-2 compliant, bipolar circuit breaker with an interruption capacity
of at least 25kA is recommended.
If using a clock with redundant power supplies, use a separate circuit breaker or switch for the wiring of the
second power supply.
2.3.2 Grounding
For optimal electromagnetic compatibility, use a grounding wire with at least 10 AWG (6mm
to connect the grounding bolt at the rear panel of the clock to a good ground point on the mounting cabinet.
2.4
Antenna Installation
Clocks require an active antenna in order to track satellites. NovaTech recommends using the antenna
provided with the clock (see Antenna), but any other active antenna that can be powered with 3.3V dc and
100mA maximum consumption can be used. Contact NovaTech for further information if you wish to use a
different antenna.
2.4.1 Antenna Location
Mount the antenna outdoors, with the radome pointing skywards and with an unobstructed view of the sky.
As far as possible, mount the antenna above any surrounding buildings.
Note:
A partially obstructed sky view might delay or even prevent the initial satellite fix required
to start operation of the clock.
2.4.2 Antenna Mounting
The NovaTech antenna mount is described in section
2.4.3 Antenna Cables
The antenna has to be connected to the clock by using a coaxial cable with TNC male connectors at both
ends.
Note:
The antenna cable should be routed through a conduit, shielded from rain and/or solar
radiation. The conduit should not be shared with any power cabling.
Total cable attenuation should be less than 40dB which can be determined from the cable length and the
attenuation per foot.
Antenna
Mount.
12
Kronos Series 3
2
) cross section
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