A Power system earth
B Exposed conductive parts
Network type TT (Terra Terra) :
The TT power distribution system has one point that is directly earthed. In addition, the exposed conductive
parts of the installation are connected to earth electrodes that are independent from the power system's earth.
A Power system earth
B Exposed conductive parts
Network type IT (Impedance Terra) :
The IT power distribution system has no direct connection to Protective Earth (PE). It is earthed via a high
ohmic impedance, so that the network is effectively behaving like an unearthed floating network. The exposed
conductive parts of the installation are directly connected to earth. In the event of an initial earth leakage fault
of a motor phase, the power supply continues. However, the customer must detect the initial earth leakage
fault. The fault must be indicated as an alarm.
A Power system earth
B Exposed conductive parts
C Impedance
Ambient conditions
The drive must only be used in a heated, indoor and controlled environment. Environmental
limits are listed below.
Instruction book
94 2920 1728 05
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