structure
Keypad and
format
Advanced
parameter
descriptions
Serial comms
2:
Torque
control
with
speed
override
The output of the speed loop defines the torque demand, but is limited between 0 and the resultant torque reference (Pr
4.08
+ Pr
4.09
(if
enabled)). The effect is to produce an operating area as shown below if the final speed demand and the resultant torque reference are both
positive. The speed controller will try and accelerate the machine to the final speed demand level with a torque demand defined by the resultant
torque reference. However, the speed cannot exceed the reference because the required torque would be negative, and so it would be clamped
to zero.
Current
Pr
4.08
+
Pr
4.09
(if enabled)
Pr
3.01
Speed
Depending on the sign of the final speed demand and the resultant torque the four areas of operation shown below are possible.
+ final speed demand
+ resultant torque
- final speed demand
+ resultant torque
+ final speed demand
-resultant torque
- final speed demand
- resultant torque
This mode of operation can be used where torque control is required, but the maximum speed must be limited by the drive.
3:
Coiler/uncoiler
mode
Positive final speed demand: a positive resultant torque will give torque control with a positive speed limit defined by the final speed demand. A
negative resultant torque will give torque control with a negative speed limit of -5 rpm.
Negative final speed demand: a negative resultant torque will give torque control with a negative speed limit defined by the final speed demand. A
positive resultant torque will give torque control with a positive speed limit of +5 rpm.
Example
of
coiler
operation:
This is an example of a coiler operating in the positive direction. The final speed demand is set to a positive value just above the coiler reference
speed. If the resultant torque demand is positive the coiler operates with a limited speed, so that if the material breaks the speed does not exceed a
level just above the reference. It is also possible to decelerate the coiler with a negative resultant torque demand. The coiler will decelerate down to -
5 rpm until a stop is applied. The operating area is shown in the following diagram:
Area for coiler operation, speed
limited to ref and positve torque
Torque
Final speed
demand
Speed
-5rpm
Area for decelerating the coiler, reverse
speed limited and negative torque
62
Mentor MP Advanced User Guide
www.onxcontrol.com
Issue Number: 4
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