Reduced Overcurrent Due To Time; Table 14: Overcurrent Relative To Time - Nord Drivesystems NORDAC PRO SK 500P Manual With Installation Instructions

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
Time [s]
Pulse frequency
[kHz]
3...8
10
12
14
16
400V devices: Reduced overload capacity (approx.) due to pulse frequency (P504) and time
Time [s]
Pulse frequency
[kHz]
3...6
8
10
12
14
16

Table 14: Overcurrent relative to time

BU 0600 en-3221
> 600 60
110% 150%
103% 140%
96% 130%
90% 120%
82% 110%
> 600 60
110% 150%
100% 135%
90% 120%
78% 105%
67% 92%
57% 77%
8 Additional information
30 20
170% 180%
155% 165%
145% 155%
135% 145%
125% 135%
30 20
170% 180%
150% 160%
135% 145%
120% 125%
104% 110%
87% 92%
10 3.5
180% 200%
165% 180%
155% 160%
145% 150%
135% 140%
10 3.5
180% 200%
160% 165%
145% 150%
125% 130%
110% 115%
92% 100%
235