Firmware 03.00 - DMS EN 5.0 - 07/2009 L 97
8400 BaseLine D | Software Manual
Motor control (MCTRL)
Definition of current and speed limits
5.4.2 Definition of current limits
The 8400 controllers are provided in the various operating modes with functions which
determine the dynamic behaviour under load and counteract the exceedance of the
maximum current in motor or generator mode.
The max. motor or generator current is limited with the codes C022
or C023.
The current limits must be selected depending on
the permissible maximum motor current
– Recommendation: I
max
< 1.5 ... 2.0 I(mot)
N
the permissible maximum inverter current
the required motor or generator torque for the application
How to adapt the peak current limitation:
SLVC:
• Reduce slip compensation with C021
.
• Reduce nTorqueMotLim C728/1
and nTorqueGenLim C728/2.
Note!
Highly dynamic applications
(e.g. low acceleration and deceleration ramp times or greatly fluctuating loads)
The overcurrent disconnection may respond (fault message OC1 or OC11) when
the parameterisation of the maximum current in motor mode C022
approximately corresponds to the maximum permissible value of the respective
inverter.
Remedy by
• Increase of the acceleration and deceleration ramp time,
• Reduction of the maximum current C022
/ C023 in motor/generator mode
• Adaptation of the indirect peak current limitation which is implemented
depending on the type of operation (for procedure see below)
• Reduction of the reset time of the current limitation controller with C074/1
.
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