Menu 21 Introduction Parameter x.00
Parameter
description format
Keypad and
display
CT Modbus
RTU
User
programming
CT Soft Menu 0
Advanced parameter
descriptions
166 Commander SK Advanced User Guide
www.controltechniques.com Issue Number: 2
The active current limit is compared with the active current and if the current exceeds the limit the error value passes through the PI controller to give
a frequency component which is used to modify the ramp output. The direction of the modification is always to reduce the frequency to zero if the
active current is motoring, or to increase the frequency towards the maximum if the current is regenerating. Even when the current limit is active the
ramp still operates, therefore the proportional and integral gains (Pr 4.13 and Pr 4.14) must be high enough to counter the effects of the ramp. For
method of setting the gains see Pr 4.13 and Pr 4.14 on page 50.
In torque control mode the current demand is limited by the active current limit. For operation of this mode see Pr 4.11 on page 50.
PPr4.13
IPr4.14
Current limit
active
1
0
Active
current
limit
Post ramp
reference
Ramp
Active
current
-
+
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