5-2. Output Current Detection Characteristics
Frequency inverter has several detection characteristics for output current to protect IGBT from break
down, or to protect motor from over heat.
[1] Over current
Frequency inverter shuts off the output instantaneously when output current exceeds to 220%(190)
of its rated current. (OC level is no link with Electronic thermal level)
e.g. Over current protection level of SJ100-015NFE (7.1 Amps of rated current) is
7.1 [Arms] * 200% = 14.2 [Arms] = 20.1 [A peak]
[2] Over load (Electronic thermal protection)
Frequency inverter shuts off the output when integration value of output current and time exceeds
specific value.
This Electronic thermal level can be changed from 50% to 120%. (Initial setting is 100%.)
220%(190%)
150%
180s
120s
time
150%, 60s
E-Thermal Level = [100]
No over load trip with
115% load
60s
180%, 10s
% output current of the rated current of the frequency inverter
0
100%
220%(190%)
150%
180s
120s
time
150%, 60s
60s
180%, 10s
% output current of the rated current of the frequency inverter
0
100%
50%
E-Thermal Level = [50]
5-3
Over Current trip
220%(-> 4kW)
190%(5.5kW ->)
Summary of Contents for SJ100 Series
Page 3: ...Revisions Revision history table No Revision contents Date of issue Manual No ⅰⅰ ...
Page 40: ......
Page 56: ......
Page 57: ......
Page 58: ......
Page 59: ......
Page 60: ......
Page 61: ......
Page 62: ......
Page 63: ......
Page 64: ......
Page 65: ......
Page 66: ......
Page 67: ......
Page 68: ......
Page 69: ......
Page 70: ......
Page 71: ......
Page 72: ......
Page 73: ......
Page 74: ......
Page 75: ...End of page ...