Lenze EDB9300UES - Manual (Page 106)

Operation and Software
BA8230 101
4.4.2 Application parameter Speed limit
This is a higher level demand limit which takes effect after demand selection
and before the ramp. It serves to protect against excessive speed and is initialised at
rated synchronous speed by the type data module.
The parameter setting is adjusted in proportion if the ratio between "standard
frequency" and "no. of pairs of poles" is altered.
The speed limit corresponds to the "frequency limit” parameter.
Adjustment range: 0 ... 2 * "standard frequency" * 60/no. of pairs of poles
As supplied: 1500 min
-1
Ref. overspeed
This parameter can be used to preset a speed comparison value which, if exceeded,
causes the 8230 frequency inverter to shut down and enters a corresponding
message in the error log.
This error must be acknowledged before the drive can be restarted.
The parameter setting is affected proportionally if the ratio between "standard
frequency" and "no. of pairs of poles" is adjusted.
Adjustment range: 0 ... 2 * "standard frequency" * 60/no. of pairs of poles
As supplied: 1800 min
-1
Max. motor current limit
This parameter determines the motor overload current which can be sustained for
max. 60 s on a 10 % duty cycle. After the monitored overload duration the system
switches back to the “rated motor current limit”.
The value displayed is based on the load components in the motor rated current and
in the constant flux range therefore corresponds to the torque.
If a parameter should change, the type data module initialises the limit to 150 % if
permitted for the inverter maximum current.
If a value below the “rated motor current limit” is set as the overload limit, this is
limited to the value of “max. motor current limit”.
In the “frequency control” structure the inverter is shut down when the permitted
overload duration is reached.
Adjustment range: 0 ... value which provides the maximum inverter current
As supplied: ca. 135 %
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