Emerson Affinity User Manual

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Affinity User Guide 107
Issue Number: 5 www.controltechniques.com
Pr 0.06 limits the maximum output current of the drive (and hence
maximum motor torque) to protect the drive and motor from overload.
Set Pr 0.06 at the required maximum torque as a percentage of the rated
torque of the motor, as follows:
(%)
Where:
T
R
Required maximum torque
T
RATED
Motor rated torque
Alternatively, set 0.06 at the required maximum active (torque-
producing) current as a percentage of the rated active current of the
motor, as follows:
(%)
Where:
I
R
Required maximum active current
I
RATED
Motor rated active current
6.2.4 Voltage boost, (open-loop), Speed-loop PID
gains (RFC)
Open-loop
There are six voltage modes available, which fall into two categories,
vector control and fixed boost. For further details, refer to section Pr
0.07 {5.14} Voltage mode on page 122.
RFC
Pr 0.07 (3.10) operates in the feed-forward path of the speed-control
loop in the drive. See Figure 11-4 on page 154 for a schematic of the
speed controller. For information on setting up the speed controller
gains, refer to Chapter 8 Optimization on page 121.
Open-loop
When 0.07 Voltage mode selector is set at Fd or SrE, set Pr 0.08 (5.15)
at the required value for the motor to run reliably at low speeds.
Excessive values of Pr 0.08 can cause the motor to be overheated.
RFC
Pr 0.08 (3.11) operates in the feed-forward path of the speed-control
loop in the drive. See Figure 11-4 on page 154 for a schematic of the
speed controller. For information on setting up the speed controller
gains, refer to Chapter 8 Optimization on page 121.
Open-loop
Set Pr 0.09 (5.13) at 0 when the V/f characteristic applied to the motor is
to be fixed. It is then based on the rated voltage and frequency of the
motor.
Set Pr 0.09 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.
Figure 6-2 Fixed and variable V/f characteristics
RFC
Pr 0.09 (3.12) operates in the feedback path of the speed-control loop in
the drive. See Figure 11-4 on page 154 for a schematic of the speed
controller. For information on setting up the speed controller gains, refer
to Chapter 8 Optimization on page 121.
6.2.5 Monitoring
Open-loop
Pr 0.10 (5.04) indicates the value of motor speed that is estimated from
the following:
0.12 Post-ramp frequency reference
0.42 Motor - no. of poles
0.06 {4.07} Current Limit
RW Uni RA US
Ú
0 to Current_limit_max %
Ö
110
0.07 {5.14} Voltage mode selector
RW Txt US
OL
Ú
Ur_S (0), Ur (1), Fd (2),
Ur_Auto (3), Ur_I (4),
SrE (5)
Ö
Fd (2)
0.07 {3.10} Speed controller proportional gain
RW Uni US
RFC
Ú
0.0000 to 6.5535
1/rad s
-1
Ö
0.0300
0.08 {5.15} Low frequency voltage boost
RW Uni US
OL
Ú
0.0 to 25.0% of motor
rated voltage
Ö
Size 1 to 3: 3.0
Size 4 & 5: 2.0, Size 6: 1.0
0.06[]
T
R
T
RATED
--------------------
100×=
0.06[]
I
R
I
RATED
-------------------
100×=
0.08 {3.11} Speed controller integral gain
RW Uni US
RFC
Ú
0.00 to 655.35
1/rad
Ö
0.10
0.09 {5.13} Dynamic V/F / flux optimize select
RW Bit US
OL
Ú
OFF (0) or On (1)
Ö
OFF (0)
0.09 {3.12} Speed controller differential feedback gain
RW Uni US
RFC
Ú
0.00000 to 0.65535(s)
Ö
0.00000
0.10 {5.04} Estimated motor speed
RO Bit FI NC PT
OL
Ú
±180,000 rpm
Ö
Motor
voltage
Frequency
AC supply
voltage
IMOTOR

Emerson Affinity Specifications

General

Brand	Emerson
Model	Affinity
Category	Controller
Language	English