Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010 L 199
8400 HighLine | Parameter setting & configuration
Motor control (MCTRL)
Monitoring
5.11.2 Motor load monitoring (I2xt)
The Inverter Drives 8400 are provided with a simple, sensorless, thermal I
2
xt motor
monitoring of self-ventilated standard motors which is based on a mathematical model.
C00066
displays the calculated motor load in [%].
If the calculated motor load reaches the switch-off threshold set in C00120
:
– The error response set in C00606
will be carried out (Lenze setting: "Warning").
–The "OC6: I2xt overload motor
" error message will be entered into the logbook of the
controller.
–The bMctrlI2xtOverload status output of the LS_DeviceMonitor
system block will be
set to TRUE.
A setting of C00606
= "0: No Reaction" deactivates the 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 set overload threshold (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.
Stop!
The I
2
xt motor monitoring does not present full motor protection! As the motor
utilisation calculated in the thermal motor model is lost after mains switching,
for instance the following operating states cannot be measured correctly:
• Restarting (after mains switching) of a motor that is already very hot.
• Change of the cooling conditions (e.g. cooling air flow interrupted or too
warm).
A full motor protection requires additional measures as e.g. the evaluation of
temperature sensors that are located directly in the winding or the use of
thermal contacts.
I
r
: Rated motor current (see nameplate of motor)
I
N
: Rated controller current at a switching frequency of f = 8 kHz
C00120
I
r
I
N
---- -
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