Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011 L 235
8400 StateLine C | Reference manual
Motor control (MCTRL)
Monitoring
[5-29] 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
( 122)
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
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