Voltage Attenuator Resistors; Voltage Attenuator Resistors Software Supported Voltages - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Advanced Operating Functions

8.12 Voltage Attenuator Resistors

8.12 Voltage Attenuator Resistors
8.12.1 Voltage Attenuator Resistors
Input and output voltages are attenuated to provide a low voltage signal for measurement.
Typically, two resistors are used, on both the input and output sides, to support medium
voltages. The attenuator circuit is used to convert medium voltages to low voltage measurement
signals. Calculations are carried out at the Siemens factory. If issues exist with calculations,
consult Siemens.
Even if the discrete value of available resistors is not the same as the exact calculated value, no
scaling is required; the software automatically scales the voltages as needed.
NOTICE
Drive Stability
Selecting attenuator resistors incorrectly can cause unintended results that affect drive stability
and drive protections.
The input attenuator resistors must be selected to match the input transformer nameplate
rating. The output attenuator resistors must be selected to match the motor nameplate rating.
Electric Shock Hazard
Protection of the transorbs in the attenuator circuit is violated by placing a third resistor inside
the control cabinet in series with the medium voltage resistors.
If the protection of the transorbs in the attenuator circuit is violated, dangerous voltages are
introduced into the control cabinet, which could cause death or serious injury.
Never place a third resistor inside the control cabinet in series with the medium voltage
resistors to achieve the calculated values.
8.12.2

Voltage Attenuator Resistors Software Supported Voltages

Software Supported Voltages for Attenuator Resistors
Although the voltage ranges for the input, 200 to 125000 V, and the output, 200 to 23000 V,
allow for much flexibility, the usable voltages must be supported by the appropriate set of
attenuator resistors. The values input to the drive determine the rated input and output voltages
respectively. If not set to the values represented by the actual hardware devices, the drive may
not operate properly.
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WARNING
NXGPro+ Control Manual
Operating Manual, A5E50491925A