NORDAC PRO (SK 500P) – Users Manual for Frequency Inverters
208 BU 0600 en-2319
8.4.4 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 400 V 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
Une tz
Une tz( )
480320 Une tz
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
Figure 14: Output current due to mains voltage
8.4.5 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.
8.5 Operation on the FI circuit breaker
For devices with an active mains filter (standard configuration for TN- / TT networks) leakage currents
of ≤ 16 mA are to be expected. These are designed for operation with leakage current circuit breakers
for the protection of persons.
For devices with an inactive mains filter (special configuration for TN networks) leakage currents
of ≤ 30 mA are to be expected. These are not suitable for operation with leakage current circuit
breakers for the protection of persons.
Only all-current sensitive FI circuit breakers (type B or B+) must be used.
( Section 2.5.3.2 "Mains connection (PE, L1, L2/N, L3)")
( See also document TI 800_000000003
.)
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