apfiff09 marine
VACON®
•
191
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
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P2.8.3
Torque Select
ID1278 (P2.2.9.6)
“
Torque Select
”
This parameter defines the speed limiting mode in torque control mode. This parameter
can be used as single motor control mode selection when no change is made between
open loop and closed loop controls.
0=
“SpeedControl”
- Speed control mode
The drive is forced to operate in speed control mode while the motor control mode
parameter is set to torque control mode thus allowing selection of speed control and
torque control mode with single parameter e.g. from Fieldbus.
1=”MaxFreqLimit”
- Positive and negative frequency limits
Speed is not limited by speed reference, only maximum frequency or Positive and
Negative frequency limit if set lower than maximum frequency parameter.
2=”RampOutput” –
Ramp output for both directions
Speed is limited by reference after ramp generator, thus speed will increase with set
ramp time until actual torque is equal to reference torque. If speed is below the reference
when load is removed from the shaft, the speed will increase without ramp.
This is the default selection. For master follower system, it is recommended to use a
selection that allows a little higher reference for torque follower that load will be balanced
equally, for example, in window control.
3=”Min” –
Minimum from speed reference and torque reference.
The minimum of the speed controller output and the torque reference is selected as final
torque reference.
4=”Max” –
Maximum from speed reference and torque reference
The maximum of the speed controller output and the torque reference is selected as final
torque reference.
5=”Window” –
Window control
Speed is limited within window from speed reference.
Speed control activation limit is different from the speed limit. Speed needs, therefore, to
go first to “Window Pos” or “Window Neg” limit before
the speed controller activates,
when speed controller is active speed will be restricted to l
imit defined by “Window Pos
Off” and “Windows Neg Off” from the “FinalFreqRef”
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