NORD Drivesystems BU0505 - Manual (Page 175)

8 Additional information
BU 0505 GB-1013 175
1
8.5.4 Reduced output current due to mains voltage
The devices are designed with thermal characteristics according to the nominal output currents.
Accordingly, for lower mains voltages, higher currents cannot be taken off in order to maintain the
stated power constant. For mains voltages above 400v there is a reduction of the permissible
continuous output current, which is inversely proportional to the mains voltage, in order to
compensate for the increased switching losses.
1.2
0.4
k Unetz Unetz ( )
480 320 Unetz
320 340 360 380 400 420 440 460 480
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
Mains voltage [V]
I / I
N
Fig. 17: Output current due to mains voltage
Pos : 454 /Anleit ungen/8. / 9. Zusatzinfor mationen [BU 0500 / BU 0200]/ 8. 5. 5 R eduzi erter Ausgangsstrom aufgrund der Kühl körpert emperatur @ 0\ mod_1328189183973_388. doc x @ 14397 @ 3 @ 1
8.5.5 Reduced output current due to the heat sink temperature
The temperature of the heat sink in included in the calculation of the reduction of output current, so
that at low heat sink temperatures, a higher load capacity can be permitted, especially for higher pulse
frequencies. At high heat sink temperatures, the reduction is increased correspondingly. The ambient
temperature and the ventilation conditions for the device can therefore be optimally exploited.
Pos : 455 /Anleit ungen/8. / 9. Zusatzinfor mationen [BU 0500 / BU 0200]/ 8. 6 Betrieb am FI- Schutz schalt er [ BU 0500] @ 0\ mod_1328189221206_388. doc x @ 14420 @ 2 @ 1
8.6 Operation with FI circuit breakers
SK 5xxE frequency inverters are designed for operation with a 30mA all-current sensitive FI circuit
breakerFI circuit breaker. If several frequency inverters are operated on a single FI circuit breaker, the
leakage currents to earth must be reduced. For further details, please refer to Section 2.10.2.
Pos : 456 /Anleit ungen/8. / 9. Zusatzinfor mationen [BU 0500 / BU 0200]/ 8. 7 Energieeffizi enz @ 0\mod_1328189266800_388. doc x @ 14443 @ 2 @ 1