Lenze DSD - Manual (Page 350)

11 Drive Dimensioning
11.6 Inverters
350
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
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11.6.1.4 Overcurrent operation for i700
Temporarily, the power supply modules and axis modules can be operated with output currents
higher than the rated current.
Two utilisation cycles are specified, each with a running time and a recovery time. A running time
must be followed by a recovery time. The current must not exceed the indicated value in the recov-
ery time. All values refer to the rated output current.
• 15-s cycle: pulse utilisation
• 3 s running time with peak current (200 %)
• 12 s recovery time with limited current (66 %)
• 180-s cycle: permanent utilisation
• 60 s running time with peak current (150 %)
• 120 s recovery time with limited current (75 %)
The illustration below shows typical curves of utilisation cycles:
[11-21] Overcurrent capability i700 at 40 °C
 15-s cycle: pulse utilisation Equation:
 Peak current
 Limited current during the recovery time
t
1
Running time with peak current
t
2
Recovery time with limited current
 180-s cycle: permanent utilisation Equation:
 Peak current
 Limited current during the recovery time
t
3
Running time with peak current
t
4
Recovery time with limited current
t 0
100 %
1
0
2
I [%]
N,out
t
2
t
3
t
4
t
1

‚
A t
1
C t
2
⋅ + ⋅
t
1
t
2
+
-------------------------------- 100 % ≤
A t
3
C 4 ⋅ + ⋅
t
3
t
4
+
------------------------------ 100 % ≤