Control Techniques Unidrive 1 Series User Manual page 73

Safety Product Mechanical
Information Information Installation
Use Pr 0.05 to select the required frequency/speed reference, as
follows:
Setting Control mode Function
Analog frequency / speed reference selected
0 Terminal
by ANALOG INPUT 1 / INPUT 2 contact
1 Terminal Analog frequency / speed reference 1 selected
2 Terminal Analog frequency / speed reference 2 selected
Preset frequency / speed references selected
3 Terminal
(not used with Menu 0)
4 Keypad Frequency / speed controlled by the keypad
Precision reference selected
5 Terminal
(not used with Menu 0)
0.06 {4.07} Current Limit
RW Uni
OL
0 to I %
VT
MAX
SV
*This parameter has a default setting of 120% in Unidrive VTC.
For the definition of I %, seesection 8.2 Current limits on page 98.
MAX
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:
T
R
×
Pr 0.06 = -------------------- 100 (%)
T
RATED
Where:
T Required maximum torque
R
T Motor rated torque
RATED
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:
I
R
×
----------------- -
Pr 0.06 = 100 (%)
I
RATED
Where:
I Required maximum active current
R
I Motor rated active current
RATED
Unidrive User Guide
Issue Number: 9
Electrical Getting
Menu 0
Installation Started
150*
150
175
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Running
Optimisation Macros
the motor
6.2.4 Voltage boost (open-loop),
Speed-loop PID gains (closed-loop)
0.07 {5.14} OL> Voltage mode selector
0.07 {3.10} CL> Speed controller proportional gain
RW Uni
Ur_S (0), Ur_l (1), Ur (2),,
OL
Fd (3)
CL 0 to 32,000 %
*This parameter has a default setting of Fd (3) in Unidrive VTC.
Open-loop
Setting
Motor stator resistance is measured each time the drive is
Ur_S 0
started.
Motor stator resistance is measured at power-up if the
Ur_I 1 EXTERNAL TRIP contact is closed and no other trip
condition exists.
Motor stator resistance is not measured (use this mode only
Ur 2 after having used Ur_S or Ur_I to measure the stator
resistance).
Fixed voltage boost that can be manually adjusted by
Fd 3
parameter 0.08 Boost voltage.
Use Pr 0.07 (Pr 5.14) to select fixed voltage boost, or Vector control of
voltage boost. Fixed boost requires a value to be set in Pr 0.08 Boost
voltage by the user. See Figure 6-3. Fixed boost should be used when
Pr 0.39 Synchronize to a spinning motor is set at 1.
Figure 6-3 Effect of fixed voltage boost on the voltage-to-
frequency characteristic
Motor voltage
[0.08]
Frequency
Voltage boost
Vector control causes the voltage boost to be automatically regulated
according to the load on the motor.
Vector control requires the value of stator winding resistance to be
stored in a parameter in the drive. The three Vector modes allow the
resistance to be measured under different circumstances.
Closed-loop
Pr 0.07 (Pr 3.10) operates in the feed-forward path of the speed-control
loop in the drive. See Chapter 8 Optimisation .
0.08 {5.15} OL> Voltage boost
0.08 {3.11} CL> Speed controller integral gain
RW Uni
0 to 25.0 % of motor rated
OL
voltage*
CL 0 to 32,000
*This parameter has a maximum range of 15% in Unidrive VTC.
Open-loop
When Pr 0.07 Voltage mode selector is set at Fd, set Pr 0.08 (Pr 5.15) at
the required value for the motor to run reliably at low speeds.
Advanced Technical
Diagnostics
Parameters Data
Ur_l (1)*
200
Function
Vector modes
Fixed boost mode
3.0
100
UL Listing
Information
OL> P
73