Emerson Unidrive SPM - Page 115

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Information
Unidrive SPM User Guide 115
Issue Number: 3 www.controltechniques.com
Use Pr 0.05 to select the required frequency/speed reference as follows:
Setting Pr 0.05 to 1, 2 or 3 will re-configure T28 and T29. Refer to
Pr 8.39 (Pr 0.16 in OL) to disable this function.
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
8.2.4 Voltage boost, (open-loop), Speed-loop PID
gains (closed-loop)
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 137.
Software V01.10.00 and later, the defaults are as above.
Software V01.09.01 and earlier, the default is 0.0100 in Closed-loop
vector and servo mode.
Closed-loop
Pr 0.07 (3.10) operates in the feed-forward path of the speed-control
loop in the drive. See Figure 13-4 on page 174 for a schematic of the
speed controller. For information on setting up the speed controller
gains, refer to Chapter 10 Optimization on page 136.
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.
Software V01.10.00 and later, the defaults are as above.
Software V01.09.01 and earlier, the default is 1.00 in Closed-loop vector
and servo modes.
Closed-loop
Pr 0.08 (3.11) operates in the feed-forward path of the speed-control
loop in the drive. See Figure 13-4 on page 174 for a schematic of the
speed controller. For information on setting up the speed controller
gains, refer to Chapter 10 Optimization on page 136.
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 8-2 shows the change in V/f slope when the motor
current is reduced.
0.05 {1.14} Reference selector
RW Txt NC US
Ú
0 to 5
Ö
A1.A2 (0)
Setting
A1.A2 0
Analog input 1 OR analog input 2 selectable by digital
input, terminal 28
A1.Pr 1
Analog input 1 OR preset frequency/speed selectable
by digital input, terminal 28 and 29
A2.Pr 2
Analog input 2 OR preset frequency/speed selectable
by digital input, terminal 28 and 29
Pr 3 Pre-set frequency/speed
PAd 4 Keypad reference
Prc 5 Precision reference
0.06 {4.07} Current Limit
RW Uni RA US
Ú
0 to Current_limit_max %
Ö
OL 138.1
VT 165.7
SV 150.0
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
Ur_I (4)
0.06[]
T
R
T
RATED
--------------------
100×=
0.06[]
I
R
I
RATED
-------------------
100×=
0.07 {3.10} Speed controller proportional gain
RW Uni US
CL
Ú
0.0000 to 6.5535
1/rad s
-1
Ö
VT 0.0300
SV 0.0100
0.08 {5.15} Low frequency voltage boost
RW Uni US
OL
Ú
0.0 to 25.0% of motor
rated voltage
Ö
1.0
0.08 {3.11} Speed controller integral gain
RW Uni US
CL
Ú
0.00 to 655.35
1/rad
Ö
VT 0.10
SV 1.00
0.09 {5.13} Dynamic V/F / flux optimize select
RW Bit US
OL
Ú
OFF (0) or On (1)
Ö
OFF (0)