Lenze i950

7.15.4 Speed
limitaon from the master
Reducing the line speed is used to:
•
R
educe the drive power of the winding drive.
•
The permissible input speed of the motor.
In this case, if the diameter is below d
V
max
, the line speed setpoint will be reduced in such a
way that the motor speed to be limited is not exceeded. In order to reduce the motor speed,
the system’s master drive needs to have a limiter with variable v
ref
- to v
max
- limitaon. The
values required for calculang the limitaon are stored in the winder drive.
The necessity of a limitaon of the line speed between v
ref
and v
max
is illustrated by the fol-
lowing graphics. The diagram refers to a rewinder that starts at d
min
and does not exceed
n
max
.
v [mm/s]
n [rev/s]
d [mm]
t
t
t
´
´
1
d p
Max permiss.winder speed
0x5051:097
Ref.winder
speed at dmin
0x5051:010
Master speed limit value
0x5051:038
Min. diameter
0x5051:016
Area of velocity
limitation
Reference line velocity
0x5051:012
Actual diameter
0x5051:096
Fig. 58: Dialogue overview "Monitoring seng -
Limitaon of master speed"
For an unwinder, a limitaon may also be required.
Source of the master value
When changing the parameter, the inverter must be inhibited.
The master values for the technology applicaon come from a variety of sources. The source
is select
ed via the Master value source parameter. 0x5020:014
The following sources can be selected:
•
System bus
•
Load encoder
•
Virtual master
•
Analog input 1
Conguring the "Winder Dancer" TA
Monit
oring
Speed limitaon from the master
149