Lenze 8400 - Manual (Page 283)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
283
5 Motor control (MCTRL)
5.14 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 Motor overload setting ( C00120 ) is calculated 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.
[5-34] Tripping characteristic of the I 2 xt monitoring

Note!
From version 07.00.00 , the thermal motor load displayed in C00066 can be pre-
initialised when the device is connected to the mains, optionally using a fixed value or
the value used last at the time when the device was switched off. The desired
initialisation is selected in C00122 . In the Lenze setting of C00122 , the behaviour
remains unchanged (no initialisation).
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
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 >