Siemens MICROMASTER 411 - Manual (Page 117)

Issue 03/01 10 Engineering Information
MICROMASTER 411 & COMBIMASTER 411 Operating Instructions
6SE6400-5CA00-0BP0 117
Figure 10-1 Current Limit Interaction
10.1.1 Current Monitoring Accuracy
Table 10-1 shows sample results comparing current measured with a current
scope, and the current displayed on the inverter, using measurements taken from a
variety of inverters at various switching frequencies, current loads, frequency
setpoints and cable lengths.
Table 10-1 Measured Current Monitoring Accuracy
Inverter Frame Size B, 400 V
1,5 kW Frame Size C, 400 V
3,0 kW
Switching frequency 4 kHz 4 kHz
Load on inverter Nominal load 4 A Nominal load 7,7 A
Frequency setpoint 45 Hz 45 Hz
Scope current (long cable)* 4,00 A 7,70 A
Drive current 4,05 A 7,46 A
% difference (inverter/scope)* 1,32 % -3,9 %