Lenze DSD - Manual (Page 348)

11 Drive Dimensioning
11.6 Inverters
348
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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11.6.1.2 Thermal utilisation (Ixt)
For determining the thermal utilisation the required current is evaluated via a device-internal mon-
itoring function. It is simulated for the steady state.
• The momentary current utilisation of the inverter is calculated from the ratio of the required
motor current to the inverter output current available. The inverter output current is reduced
according to the applicable basic conditions.
• The maximum value of the thermal utilisation reflects the monitoring function of the inverter.
[11-19] Inverter diagram: Thermal utilisation
Description
 Instantaneous utilisation
 Max. value of the thermal utilisation
 100 % utilisation
• 100 % corresponds the rated threshold.
 Thermal utilisation
• Simulated value, calculated with the time constant of the motor.
 I×t pulse utilisation
 Performance features
• The performance features can also be found in the selection table. Selection table ( 355)