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

Issue 03/01
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
Inverter
Switching frequency
Load on inverter
Frequency setpoint
Scope current (long cable)*
Drive current
% difference (inverter/scope)*
MICROMASTER 411 & COMBIMASTER 411
6SE6400-5CA00-0BP0
Measured Current Monitoring Accuracy
Frame Size B, 400 V
1,5 kW
4 kHz
Nominal load
45 Hz
4,00 A
4,05 A
1,32 %
Operating Instructions
10 Engineering Information
Frame Size C, 400 V
3,0 kW
4 kHz
4 A
Nominal load
45 Hz
7,70 A
7,46 A
-3,9 %
7,7 A
117