Lenze 8400 - Manual (Page 284)

5 Motor control (MCTRL)
5.14 Monitoring
284
Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
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Example:
C00120 = I
r
/I
rated
x 100 % = C00088 / C00098 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 ( 145)
5.14.3 Motor overcurrent monitoring
The ultimate motor current to be parameterised in C00939 is a limit value to protect the motor from
destruction, influence of the rated data and demagnetisation.
• This limit value must not be travelled cyclically in the drive process.
• If the instantaneous value of the motor current exceeds the limit value set in
C00939 , the error
response "Fault" occurs to protect the motor and the error message " oC7: Motor overcurrent " is
entered into the logbook.
• The maximum currents to be parameterised in C00022 and C00023 should have a sufficient
distance to this limit value.
Related topics:
 Maximum current monitoring ( 291)

Note!
If a Lenze motor is selected from the catalogue whose plant parameters are transferred
into the controller, the setting of the maximum current in C00022 and C00023 will
automatically be adapted to the selected motor.