If using an unit with redundant power supplies, repeat the above steps for the
second power supply.
A 1.5 mm
2
(16 AWG) ground lead shall be connected to the terminal marked
DANGER
→
with the protective earth symbol to protect the operator against the risk of
electrical shock.
2.3.1 Fusing Requirements
If compliance with IEC 61010 is required, install an external bipolar circuit
ATTENTION
→
breaker or switch near the unit so that both current-carrying conductors of
the power supply are interrupted.
DO NOT interrupt the protective earth conductor.
The use of a 10 A, category C, IEC 60947-2 compliant, bipolar circuit breaker
with an interruption capacity of at least 25 kA is recommended.
If using an unit with redundant power supplies, use a separate circuit breaker
or switch for the wiring of the second power supply.
2.3.2 Equipment Grounding
For optimal electromagnetic compatibility, use a grounding wire with at least
ATTENTION
→
6 mm
2
(10 AWG) cross section to connect the grounding bolt at the rear panel
of the unit to a good ground point on the mounting cabinet, see figure
20
115
Figure 2.3: Grounding bolt location
2.4 Antenna Installation
tīma master clocks require an active antenna in order to track GPS satellites.
recommends using the antenna provided with the unit (SKU 90 02 01 5),
but any other active antenna that can be powered from 3.3 Vdc (100 mA max-
imum) can be used. Contact
on any of the addresses provided at
the back cover of this document 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.
Installation
7
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