Lenze 8400 TopLine - Manual (Page 295)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
295
5 Motor control (MCTRL)
5.13 Monitoring
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Adjustment of the motor utilisation meter
The motor utilisation meter for indicating the motor load in
C00066 begins to count when the
apparent motor current ( C00054 ) is greater than the motor overload setting ( C00120 ).
The overload threshold ( C00120 ) is to be set as follows:
• If you reduce C00120 starting from the calculated value, the motor utilisation meter will already
be counted up before the rated overload threshold is reached.
• If you increase C00120 starting from the calculated value, the motor utilisation meter will not
be counted up until the rated overload threshold is reached.
[5-33] Tripping characteristic of the I 2 xt monitoring
Example in Figure [5-33] :
C00120 = I
r
/I
rated
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").
f: Output frequency
t: Release time
I
N
: Rated device current 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
C00120
Rated motor current (C00088)
Rated device current (C00098)
------------------------------------------------------------------------------ 100 % ⋅
=
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 >