GE AV-300i User Manual page 111

· Positive SpdTrq (4) Saturating the speed regulator output positive, the sum [Torque ref 1 + Torque ref 3]
can be positive or negative. The sum [Torque ref 1 + Torque ref 3] will be Torque ref
unless the Speed regulator output is more negative than the sum [Torque ref 1 +Torque
ref 3].
If sum [Torque ref 1 + Torque ref 3] is negative, while the Speed regulator output is
positive, an external control may be needed to keep from motor overspeed in the nega-
tive direction, during a material break or slippage.
· Negative SpdTrq (5) Saturating the speed regulator output negative, the sum [Torque ref 1 + Torque ref 3]
can be positive or negative. The sum [Torque ref 1 + Torque ref 3] will be Torque ref
unless the Speed regulator output is more positive than the sum [Torque ref 1 +Torque
ref 3]. If sum [Torque ref 1 + Torque ref 3] is positive, while the Speed regulator output
is negative, an external control may be needed to keep from motor overspeed in the
positive direction, during a material break or slippage.
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OTE
It is possible to assign Torque ref 3 src to Inertia compensation. This allows a user to inertia
conpensate a torque regulator internally. Using SpdTrq mode src from another variable
other than Int Spdtrq mode requires the variable to write an integer value to select the mode.
The corresponding integer is shown in parenthesis.
The Torque ref 3 src source allow to select the origin of the Torque ref 3 signal, which is adds with Torque ref
1. This source is standard connected to Int torque ref 3 [Nm] that can be set in the configurations.
The Torque ref 1 src source allow to select the origin reference signal to control the Current limit (Torque
ref 1). This source is standard connected to Int torque ref 1 [Nm] that can be set in the configurations.
The Torque ref 2 src source allow to select the origin of the Torque reference 2 signal.
This source is standard connected to Int torque ref 2 [Nm] that can be set in the configurations.
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OTE
During operation it's necessary to disable the Speed reguator output.
It is possible to set the Filter time constant on the Speed regulator proportional part, via Prop filter
parameter.
Current Torque limit control
After Torque control, the Torque Current Limit can modify Torque current reference.
Through the Tcurr lim sel parameter it is possible to select, into a list, the limit to be controlled:
off
T lim +/-
T lim mot/gen
T lim gen power
T lim Vdc ctrl
Furthermore, via the Tcurr lim + and Tcurr lim – parameters it is possible to set the positive and negative current
limit value.
Zero Torque control
The Block controls the Zero Torque sets the sum of Speed regulator output + Torque reference to zero. (Torque
reference is refered to Torque ref 1, Torque ref 2 and Torque ref 3).
The origin of the zero Torque command signal can be selected via the Zero trq cmd src source. The parameters
and the sources included into >>Torque<< are available only with a Sensorless and Field Oriented mode.
AV-300i Version 2 User's Guide
none
positive or negative limit
generator motor limit
limit on the generated power
limit on the DC link voltage control
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