Siemens SIMEAS P 7KG7750 Operating Instructions Manual page 74

All of the terminals should be checked to verify proper
•
connections.
The polarities and phasing of all instrument transform-
•
ers should be checked.
Before initial energization with supply voltage, the de-
•
vice shall be situated in the operating area for at least
two hours to ensure temperature equalization and to
avoid humidity and condensation problems.
Notes for measurings
For measurements in three-phase networks without
•
neutral in V-connection and a nominal voltage of
U = 690 V, the voltage must be transformed to
LL
≤ 400 V. The measuring range to be parameterized
U
LL
is then also U
In IT networks, the SIMEAS P cannot be connected
•
directly because the voltage is measured against the PE
conductor connection and the input impedance of the
device causes a leakage current against earth. The leak-
age current can cause tripping of the leakage protective
system in IT networks. Please make sure that the
maximum permissible input voltage of the SIMEAS P
against earth U
an earth fault of one phase). Voltage transformers must
be used in IT networks.
= 690 V.
LL
= 480 V is not exceeded (e.g., due to
L-PE
72