Replacing Fuses; Emergency-Off Equipment; Opening The Transmitter - R&S N 8000 Series System Manual

4.1.2

Replacing Fuses

Replace the safety fuses accessible in the operator area only if no voltage is being ap-
plied to the instruments. The safety fuses may be replaced only by fuses with identical
electric data, identical switching characteristics and identical switch-off capacity.
Motor and line circuit breakers accessible in the transmitter's operator area may be op-
erated. If their response range is selectable, do not change the settings made by the
manufacturer. If the settings are accidentally changed, reset them by using the correct
values specified in this documentation.
4.1.3

Emergency-Off Equipment

If the customer requests, the transmitters are equipped with emergency keys. When the
transmitters are supplied, these keys have basically no function. The transmitter opera-
tor is responsible for ensuring that these emergency keys function safely and to inte-
grate them into the emergency-off system of the operator area in accordance with the
regulations. If you subsequently decide not to use the emergency keys as an emergen-
cy-off system, you must remove them.
Extremely important! A transmitter normally has several AC supply circuits that are
independent from each other, such as main AC supply circuit, AC current supply for ac-
cessory equipment (main control unit, antenna switch, etc) or AC current supply for a
disabled socket.
The transmitter operator is responsible for making sure that all these circuits are inte-
grated correctly into the emergency-off system. Circuits not integrated have to be la-
beled accordingly.
Never set up a transmitter that is equipped with disabled emergency-off equipment.
4.1.4

Opening the Transmitter

When you open the transmitter to carry out mechanical/electrical tasks (e.g. cleaning,
repair, etc) always follow the five basic rules for working with electrical systems:
– Disconnect the transmitter from the power supply
– Secure it against inadvertent switch-on
– Verify safe isolation from any power
– Ground or short-circuit it
– Cover adjacent active circuits.
Extremely important! A transmitter normally has several AC supply circuits that are in-
dependent from each other, such as main AC supply circuit, AC current supply for ac-
cessory equipment (main control unit, antenna switch, etc) or AC current supply for a
disabled socket.
Prior to performing any work, check the current status of the circuits. Also disconnect
adjacent circuits to prevent inadvertent contact.
2 Not all transmitter types can be grounded or short-circuited by using a grounding or short-circuit switch. If a
suitable device for grounding or short-circuiting is not available, the skilled personnel must take appropriate
measures as deemed necessary.
2098.1190.72
Chapter 1
2
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Safety Instructions
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