Siemens MICROMASTER 411 - Figure 10-1 Current Limit Interaction; Table 10-1 Measured Current Monitoring Accuracy

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 %