Lenze 8200 vector series - Page 111

Safety instructions
Thermal motor monitoring
2

111
EDK82EV903 DE/EN/FR 5.1
Adjustment
1. Calculate C0120. This value corresponds to a motor utilisation of 100 %:
C0120[%] +
I
r
I
N
@ 100%
I
r
Rated motor current
I
r
Rated controller current at switching frequency 8 kHz
2. If you decrease C0120 on the basis of the value calculated, the monitoring already
responds at a motor utilisation < 100 %.
3. If you increase C0120 on the basis of the value calculated, the monitoring only
responds at a motor utilisation > 100 %.
The controller switches off with error OC6 if the apparent motor current is greater than the
rated motor current for a longer time.
60
180
240
300
360
t [s]
0.5
0
0
1.0
1.5 2.0
C0054
I
r
120
f=0Hz
f=20Hz
f>40Hz
I x 100 %
I
r
N
C0120 <
I x 100 %
I
r
N
C0120 =
I x 100 %
I
r
N
C0120 >
8200vec523
f Output frequency
t Release time
I
N
Rated controller current at switching frequency 8 kHz
I
r
Rated motor current
C0054 Apparent motor current
Example:
C0120 +
I
r
I
N
@ 100%
C0054 = 1.5 x rated motor current
The controller switches off at output frequencies f > 40 Hz with error OC6 after
approx. 60 s.