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130 HVAC Drive H300
Issue Number: 3
Figure 6-2 Fixed and variable V/f characteristics
RFC-A / RFC-S
Pr 00.015 (03.011) operates in the feedback path of the speed-control
loop in the drive. See section 11-4 Menu 3 RFC-A, RFC-S logic
diagram on page 214 for a schematic of the speed controller. For
information on setting up the speed controller gains, refer to section
8 Optimization on page 151.
6.3.7 Motor parameters
Open-loop
This parameter is used in the calculation of motor speed, and in applying
the correct slip compensation. When Automatic (0) is selected, the
number of motor poles is automatically calculated from the Rated
Frequency (00.021) and the Rated Speed rpm (00.019). The number of
poles = 120 * rated frequency / rpm rounded to the nearest even
number.
RFC-A
This parameter must be set correctly for the vector control algorithms to
operate correctly. When Automatic (0) is selected, the number of motor
poles is automatically calculated from the Rated Frequency (00.021) and
the Rated Speed rpm (00.019) rpm. The number of poles = 120 * rated
frequency / rpm rounded to the nearest even number.
RFC-S
This parameter must be set correctly for the vector control algorithms to
operate correctly. When auto is selected the number of poles is set to 6.
Open-loop and RFC-A
Enter the value from the rating plate of the motor.
Open-loop
This is the speed at which the motor would rotate when supplied with its
base frequency at rated voltage, under rated load conditions (=
synchronous speed - slip speed). Entering the correct value into this
parameter allows the drive to increase the output frequency as a
function of load in order to compensate for this speed drop.
Slip compensation is disabled if Pr 00.019 is set to 0 or to synchronous
speed, or if Pr 05.027 is set to 0.
If slip compensation is required, this parameter should be set to the
value from the rating plate of the motor, which should give the correct
rpm for a hot machine. Sometimes it will be necessary to adjust this
when the drive is commissioned because the nameplate value may be
inaccurate. Slip compensation will operate correctly both below base
speed and within the field weakening region. Slip compensation is
normally used to correct for the motor speed to prevent speed variation
with load. The rated load rpm can be set higher than synchronous speed
to deliberately introduce speed droop. This can be useful to aid load
sharing with mechanically coupled motors.
RFC-A
Rated load rpm is used with motor rated frequency to determine the full
load slip of the motor which is used by the vector control algorithm.
Incorrect setting of this parameter can result in the following:
• Reduced efficiency of motor operation
• Reduction of maximum torque available from the motor
• Failure to reach maximum speed
• Over-current trips
• Reduced transient performance
• Inaccurate control of absolute torque in torque control modes
The nameplate value is normally the value for a hot machine, however,
some adjustment may be required when the drive is commissioned if the
nameplate value is inaccurate. The rated full load rpm can be optimized
by the drive (For further information, refer to section 8.1.2 RFC-A
Sensorless mode on page 154).
RFC-S
The rated speed is not used by the motor control algorithms, but is used
by the motor thermal protection system.
00.015 {03.011}
Speed Controller Integral Feedback Gain
Ki 1
RW Num US
RFC-A
Ú
0.00 to
655.35 s
2
/rad
Ö
0.10s
2
/rad
RFC-S
00.016 {05.015} Low Frequency Voltage Boost
00.016 {03.012}
Speed Controller Differential Feedback Gain
Kd 1
RW Num US
OL
Ú
.0 to 25.0 %
Ö
1.0 %
RFC-A
Ú
0.00000 to 0.65535 1/
rad
Ö
0.00000 1/rad
RFC-S
00.017 {05.011} Number Of Motor Poles
RW Num US
OL
Ú
Automatic (0) to
480 Poles (240)
Ö
Automatic (0)
RFC-A
RFC-S
Ö
8 Poles (4)
Motor
voltage
AC supply
voltage
0.015 =1
0.015 =0
Frequency
IMotor
00.018 {05.009} Rated Voltage
RW Num RA US
OL
Ú
±VM_AC_VOLTAGE_
SET
Ö
200 V drive: 230 V
50Hz default 400 V drive: 400 V
60Hz default 400 V drive: 460 V
575 V drive: 575 V
690 V drive: 690 V
RFC-A
RFC-S
00.019 {05.008} Rated Speed
RW Num US
OL
Ú
0 to 33000 rpm
Ö
50 Hz default: 1500 rpm
60 Hz default: 1800 rpm
RFC-A
Ú
0.00 to 33000.00 rpm
Ö
50 Hz default: 1450 rpm
60 Hz default: 1750 rpm
RFC-S
Ú
0.00 to 33000.00 rpm
Ö
3000.00 rpm
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