Lenze i550

10.8.7 Maximum overload current of the inverter
For the purpose of current limitaon, a maximum overload current can be set for the inverter.
If the current consumpon of the motor exceeds this current limit, the inverter changes its
dynamic behaviour, in order to counteract this exceedance.
Details
•
The maximum overload current of the inverter can be set in 0x6073 (P324.00).
•
Reference for the percentage seng of the maximum overload current is the rated motor
current set in 0x6075 (P323.00).
•
The actual motor current is displayed in 0x2D88 (P104.00).
If the change in the dynamic behaviour carried out by the inverter does not
result in exing the overcurrent state, the inverter outputs an error.
When 0x6078 (P103.00) (current actual value in %) exceeds 0x6073 (P324.00) (max. current
actual value in %), a message 0x238A is displayed. The status is also displayed in the following
network status word bits:
•
0x400C:001 bit 14
•
0x400C:002 bit 2
Load response Impact
Overload during acceleraon in
motor mode
A longer me is required for reaching the frequency setpoint than has been set.
Overload during deceleraon in
generator mode
A longer me than is required for reaching standsll is set.
Increasing load at constant fre-
quency
If the motor current limit value is reached:
•
The inverter reduces the eecve speed setpoint unl a stable working is set or an eecve speed setpoint
of 0 rpm is reached.
•
If the load is reduced, the inverter increases the eecve speed setpoint unl the setpoint speed is
reached or the load reaches the current limit value again.
When the generator current limit value is reached:
•
The inverter increases the eecve speed setpoint unl a stable working point is reached or up to the max-
imum permissible output frequency 0x2916 (P211.00).
•
If the load is reduced, the inverter reduces the eecve speed setpoint unl the setpoint speed is reached
or the load reaches the current limit value again.
If an abrupt load is building at the motor sha (e.g. drive is blocked), the overcurrent switch-o funcon may
respond.
Example: Overcurrent switch-o in case of a sudden load at the motor sha
0 Hz
30 Hz
10 Hz
20 Hz
40 Hz
50 Hz
60 Hz
t
0 Hz
30 Hz
10 Hz
20 Hz
40 Hz
50 Hz
60 Hz
t
0 %
100 %
t
0x6073
Motor load
Frequency setpoint selection
Output frequency
Conguring the motor control
Motor protecon
Maximum overload current of the inverter
240