Omron RX2 Series User Manual page 288

6 Basic Parameter Settings
 Reduced Torque Characteristics [bC111]=00
Can be used for load reduction in accordance with the cooling performance at a low speed.
(Ex.2) Induction motor rated current 64A, [bC110]=64 (A)
For base frequency [Hb104]=60 Hz, output frequency=20 Hz
Reduction ratio
X1.0
X0.8
X0.6
0
0
Trip time (s)
×0.8
60
3
0
When the first electronic thermal level [bC110] is 64 A, the reduction ratio is ×0.8 for operations at a
base frequency of 60 Hz and output frequency of 20 Hz and the electronic thermal time-limited char-
acteristics are given in the lower part of Example 2.
Since Example 1 shows the case of the reduction ratio ×1, a trip occurs in 60 seconds when an elec-
tric current of 150% ×1 of the motor rated current flows continuously. However in Example 2, a trip
occurs in 60 seconds when an electric current of 150%×0.8=120% of the motor rated current flows
continuously.
6 - 50
Output frequency (Hz)
5 16 50
6 20 60
Base frequency
×1
Output current (A)
56.3 76.8 102.4
(Ratio to motor rated current)
(88%) ) (120%) (160%)
High-function General-purpose Inverter RX2 Series User's Manual