Parker Compax3S025V2, Operating Instructions Manual

Page: 132 / 314

Setting up Compax3 Positioning via digital I/Os
132
192-120101 N11 C3I11T11 November 2007
Reference point 2: Increased torque thanks to additional cooling
0 500 1000 1500 2000 2500 3000
0
0.5
1
2
2.5
3
3.5
S1 65°C DT
S3 50% 65°C DT
S3 20% 65°C DT
S1 105°C DT
[A]
[1/min]
2 2
I
0
n
2
I
2
rp2
I
0
Continual stall current
1: Nominal point
rp2: Reference point 2 (defined in the C3 ServoManager)
I
2
: Reference current to reference point 2
n
2
: Reference velocity to reference point 2
2: Forbidden range
In order to monitor the continous usage, the velocity-idenpendent current limit I
2
is
used.
If a r.m.s. current over the valid straight flows continually in the motor, the I²t
monitoring will issue the "effective motor current monitoring" error message
[0x5F48]. The period of time until the error occurs depends on the thermal time
constant of the motor defined in the motor parameters. The electronic temperature
monitoring simulates approximately the temperature behavior of the motor. By
defining a reference point different from the motor nominal data, the I²t monitoring
of the motor can be adapted to changed thermal ambient conditions (e.g. air
stream caused aby a ventilator fan).
Relevant appication parameters
In this chapter you can read about:
Switching frequency of the motor current / motor reference point ...................................................132
External Moment of Inertia...............................................................................................................135
Limit and Monitoring Settings ..........................................................................................................136
Application parameters relevant for the control (C3 ServoManager)
Compax3 is configured with the aid of the C3 ServoManager. Here you can make
application dependant settings. Among these are also parameters, that are
relevant for the control. They will be explained below.
Switching frequency of the motor current / motor reference point
In this chapter you can read about:
Following Error (Position Error) .......................................................................................................133
Reduction of the current ripple.........................................................................................................133
Motor parameters ............................................................................................................................133
Changing the switching frequency and the reference point.............................................................135
The higher the switching frequency, the better the quality of the current control. The
higher switching frequency reduces the dead time of the current control path as