The cable shield is to be grounded at both ends. For extremely EMC-prone environments, the GND may be
connected via a separate individually shielded wire pair to improve immunity to interference.
Fiber-optic Cables
WARNING
Laser Radiation! Class 1
²
Do not look directly into the fiber-optic elements!
Signals transmitted via optical fibers are unaffected by interference. The fibers guarantee electrical isolation
between the connections. Transmit and receive connections are represented by symbols.
The standard setting of the character idle state for the optical fiber interface is “Light off”. If the character idle
state is to be changed, use the operating program DIGSI as described in the SIPROTEC 4 System Description.
Checking the System Connections
WARNING
Warning of dangerous voltages
Non-observance of the following measures can result in death, personal injury or substantial prop-
erty damage.
²
Therefore, only qualified people who are familiar with and adhere to the safety procedures and
precautionary measures should perform the inspection steps.
CAUTION
Take care when operating the device without a battery on a battery charger.
Non-observance of the following measures can lead to unusually high voltages and consequently,
the destruction of the device.
²
Do not operate the device on a battery charger without a connected battery. (For limit values see also
Technical Data, Section 4.1 General Device Data).
If undervoltage protection is configured and enabled in the device and if, at the same time, the current crite-
rion is disabled, the device picks up right after auxiliary voltage has been connected, since no measuring
voltage is available. To make the device configurable, pickup is to be stopped, i.e. the measuring voltage is
connected or voltage protection is blocked. This can be performed by operation.
Before the device is energized for the first time, it should be in the final operating environment for at least 2
hours to equalize the temperature, to minimize humidity and to avoid condensation. Connections are checked
with the device at its final location. The plant must first be switched off and grounded.
Proceed as follows for checking the system connections:
3.2.2
Mounting and Commissioning
3.2 Checking Connections
330 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
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