Lenze E84DSxxx - Manual (Page 182)

5 Motor control (MCTRL)
5.10 Monitoring
182
Lenze · 8400 protec StateLine · Reference manual · DMS 4.2 EN · 03/2013 · TD05
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[5-19] Tripping characteristic of the I 2 xt monitoring
Example:
C00120 = I
r
/I
N
x 100 %
C00054 = 150 % rated motor current
• After approx. 60 seconds, C00066 has reached the final value (100 %) at output frequencies
f > 40 Hz.
• The controller outputs the " OC6: I2xt overload motor " error message and triggers the response
set in C00606 (default setting: "Warning").

Tip!
• If forced ventilated motors are used, a premature response of the overload threshold can
be avoided by deactivating this function if necessary ( C00606 = "0: No Reaction").
• The current limits set in C00022 and C00023 influence the I 2 xt calculation only in an
indirect way. However, the operation of the motor at maximum possible load can be
averted.  Defining current and speed limits ( 111)
f: Output frequency
t: Release time
I
N
: Rated current of drive controller at a switching frequency of f = 8 kHz
I
r
: Rated motor current (see nameplate of motor)
C00054 : Apparent motor current
C00120 : Motor overload setting
60
180
240
300
360
t [s]
0.5 0
0
1.0 1.5 2.0 C00054
I
r
120
f = 0 Hz
f = 20 Hz
f > 40 Hz
I x 100 %
I
r
N
C00120 <
I x 100 %
I
r
N
C00120 =
I x 100 %
I
r
N
C00120 >