Parameter descriptions
7.9.4.2 Current limit value controller
610 Operation Mode (current limit value controller)
Via a load-dependent speed control, the current limit value controller ensures that the drive system is
not overloaded. This is extended by the intelligent current limits described in the previous chapter.
The current limit value controller reduces the load on the drive, e.g. during acceleration, by stopping
the acceleration ramp. The switch-off of the frequency inverter which happens when the acceleration
ramps have been set at an excessive gradient is thus prevented.
The current limit value controller is switched on and off via parameter
Operation Mode 610.
0 -
Off
The current limit value controller functions and the intelligent current
limits have been deactivated. Factory setting.
1 -
On The current limit value controller is active.
611 Amplification
612 Integral Time
The control behavior of the current limit controller can be set via the proportional part, parameter
Amplification
611 and the integrating part, parameter Integral Time 612. If, in exceptional cases,
optimization of the controller parameters is required, proceed with the following steps:
• Change parameter
Current Limit 613 with a big step, analyze the changes in the Scope.
• For a more dynamic behavior increase
Amplification 611 and/or decrease Integral Time 612.
• For a less dynamic behavior decrease
Amplification 611 and/or increase Integral Time 612.
611 Amplification 0.01 30.00 1.00
612 Integral Time 1 ms 10000 ms 24 ms
The dynamism of the current limit value controller and the voltage controller is influ-
enced by the setting of the parameter
Dyn. Voltage Pre-Control 605.
613 Current Limit
614 Frequency Limit
Behavior in motor operation:
If the current set via parameter
Current Limit 613 is exceeded, the activated current limit value con-
troller will reduce the output frequency until the current limit is no longer exceeded. The output fre-
quency is reduced as a maximum to the frequency set by the parameter
Frequency Limit 614. If the
current value drops below the
Current Limit 613, the output frequency is raised back to the refer-
ence value.
Behavior in generator operation:
If the current set via parameter
Current Limit 613 is exceeded, the activated current limit value con-
troller will increase the output frequency until the current limit is no longer exceeded. The output fre-
quency is increased, as a maximum, to the set
Maximum Frequency 419. If the current is below the
Current Limit 613, the output frequency is reduced to the required reference value again.
No. Description Min. Max. Fact. sett.
614 Frequency Limit 0.00 Hz 999.99 Hz 0.00 Hz
I
FIN
: Nominal value of frequency inverter
o
c
: Overload capacity of frequency inverter
228
Operating Instructions
Agile
06/2013 Control functions
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