9 Additional Information
BU 0200 GB
Subject to technical alterations
245
9.5 Reduced output power
The SK 200E frequency inverter series is designed to handle certain overload situations. For example, 1.5x
overcurrent can be used for 60 sec. For approx. 3.5 sec a 2x overcurrent is possible. A reduction of the
overload capacity or its time must be taken into account in the following circumstances:
o
Output frequencies < 2Hz and constant voltages (needle stationary)
o
Pulse frequencies greater than the rated pulse frequency (P504)
o
Increased mains voltage > 400V
o
Increased heat sink temperature
On the basis of the following characteristic curves, the particular current / power limitation can be read off.
9.5.1
Increased heat dissipation due to pulse frequency
This illustration shows how the output current must be reduced, depending on the pulse frequency for 230V
and 400V devices, in order to avoid excessive heat dissipation in the frequency inverter.
For 400V devices, the reduction begins at a pulse frequency above 6kHz. For 230V devices, the reduction
begins at a pulse frequency above 8kHz.
Even with increased pulse frequencies the frequency inverter is capable of supplying its maximum peak
current, however only for a reduced period of time. The diagram shows the possible current load capacity
for continuous operation.
1.2
0.4
k 400V f puls
k 230V f puls
16
3
f puls
4
6
8
10
12
14
16
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
I / I
N
Pulse frequency [kHz]
Summary of Contents for SK 200E Series
Page 1: ...GB BU 0200 NORDAC SK 200E Frequency inverter manual Quick commissioning page 123...
Page 2: ...NORDAC SK 200E Manual 2 BU 0200 GB...
Page 138: ...NORDAC SK 200E Manual 138 Subject to technical alterations BU 0200 GB 5 4 6 Certificate...
Page 262: ...NORDAC SK 200E Manual 262 BU 0200 GB...
Page 263: ...10 Keyword index BU 0200 GB 263...
Page 264: ...NORDAC SK 200E Manual 264 BU 0200 GB Part No 607 2002 1310...
Page 265: ...The Nordac SK 200E is available to order from www inverterdrive com...