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120 Powerdrive F300 User Guide
Issue Number: 2
Set Pr 00.009 at 1 when reduced power dissipation is required in the
motor when it is lightly loaded. The V/f characteristic is then variable
resulting in the motor voltage being proportionally reduced for lower
motor currents. Figure 6-2 shows the change in V/f slope when the
motor current is reduced.
RFC-A / RFC-S
Pr 00.009 (03.012) operates in the feedback path of the speed-control
loop in the drive. See Figure 11-4 Menu 3 RFC-A, RFC-S logic
diagram on page 188 for a schematic of the speed controller. For
information on setting up the speed controller gains, refer to Figure
8 Optimization on page 151.
Figure 6-2 Fixed and variable V/f characteristics
6.3.5 Monitoring
Open-loop
Pr 00.010 (05.004) indicates the value of motor speed that is estimated
from the following:
02.001 Post Ramp Reference
00.042 Number Of Motor Poles
RFC-A / RFC-S
Pr 00.010 (03.002) indicates the value of motor speed that is obtained
from the speed feedback.
Open-loop and RFC-A
Pr 00.011 displays the frequency at the drive output.
RFC-S
Pr 00.011 displays the position of the encoder in mechanical values of 0
to 65,535. There are 65,536 units to one mechanical revolution.
Pr 00.012 displays the rms value of the output current of the drive in
each of the three phases. The phase currents consist of an active
component and a reactive component, which can form a resultant
current vector as shown in the following diagram:
The active current is the torque producing current and the reactive
current is the magnetizing or flux-producing current.
When the motor is being driven below its rated speed, the torque is
proportional to [00.013].
6.3.6 Ramp mode selector, Stop and torque mode
selectors
Pr 00.015 sets the ramp mode of the drive as shown below:
1: Standard ramp
Standard ramp is used. During deceleration, if the voltage rises to the
standard ramp level (Pr 02.008) it causes a controller to operate, the
output of which changes the demanded load current in the motor. As the
controller regulates the link voltage, the motor deceleration increases as
the speed approaches zero speed. When the motor deceleration rate
reaches the programmed deceleration rate the controller ceases to
operate and the drive continues to decelerate at the programmed rate. If
the standard ramp voltage (Pr 02.008) is set lower than the nominal DC
bus level the drive will not decelerate the motor, but it will coast to rest.
The output of the ramp controller (when active) is a current demand that
is fed to the frequency changing current controller (Open-loop modes) or
the torque producing current controller (RFC-A or RFC-S modes). The
gain of these controllers can be modified with Pr 04.013 and Pr 04.014.
00.010 {05.004} Motor Rpm
RW Bit US
OL
Ú
±180000 rpm
Ö
00.010 {03.002} Speed Feedback
RO Num FI ND NC PT
RFC-A
Ú
±VM_SPEED rpm
Ö
RFC-S
00.011 {05.001} Output Frequency (OL)
RO Num FI ND NC PT
OL
Ú
±VM_SPEED_FREQ_
REF Hz
Ö
RFC-A
Motor
voltage
Frequency
AC supply
voltage
IMOTOR
00.012 {04.001} Current Magnitude
RO Bit FI ND NC PT
OL
Ú
±VM_DRIVE_CURRENT_
UNIPOLAR A
Ö
RFC-A
RFC-S
00.013 {04.002} Torque Producing Current
RO Bit FI ND NC PT
OL
Ú
±VM_DRIVE_CURRENT
A
Ö
RFC-A
RFC-S
00.015 {02.004} Ramp Mode Select
RW Txt US
OL
Ú
Standard (1), Std boost (2)
Ö
Standard (1)
RFC-A
Ú
Standard (1)
Ö
Standard (1)
RFC-S
Active
current
Total current
Magnetising current
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