Nord Drivesystems SK 510P - Reduced Overcurrent Due to Time; Table 25: Overcurrent Relative to Time

NORDAC PRO (SK 500P) – Users Manual for Frequency Inverters
206 BU 0600 en-2319
8.4.2 Reduced overcurrent due to time
The possible overload capacity changes depending on the duration of an overload. Several values are
cited in this table. If one of these limiting values is reached, the frequency inverter must have sufficient
time (with low utilisation or without load) in order to regenerate itself.
If operated repeatedly in the overload region at short intervals, the limiting values stated in the tables
are reduced.
230V devices: Reduced overload capacity (approx.) due to pulse frequency (P504) and time
Pulse frequency
[kHz]
Time [s]
> 600 60 30 20 10 3.5
3...8
110%
150%
170%
180%
180%
200%
10 103% 140% 155% 165% 165% 180%
12
96%
130%
145%
155%
155%
160%
14
90%
120%
135%
145%
145%
150%
16 82% 110% 125% 135% 135% 140%
400V devices: Reduced overload capacity (approx.) due to pulse frequency (P504) and time
Pulse frequency
[kHz]
Time [s]
> 600 60 30 20 10 3.5
3...6 110% 150% 170% 180% 180% 200%
8
100%
135%
150%
160%
160%
165%
10
90%
120%
135%
145%
145%
150%
12 78% 105% 120% 125% 125% 130%
14
67%
92%
104%
110%
110%
115%
16 57% 77% 87% 92% 92% 100%
Table 25: Overcurrent relative to time