58
ADVANCED USER GUIDE
IP66/Nema 4X variable speed drive
MENU 5: MOTOR CONTROL
CONTROL TECHNIQUES
3854 en - 03.2008 / b
: Boost
Adjustment range : 0 to 25.0% of motor Un (
5.09
)
Factory setting
: 0
For operation in U/F mode (
5.14
at 2) or in open loop flux
vector mode if
5.58
= 1, parameter
5.15
is used to overflux
the motor at low speed so that it delivers more torque on
starting. It is a percentage of the rated motor voltage (
5.09
).
: Not used
: Stator resistance
Adjustment range : 0 to 32.000
Ω
Factory setting
: 0
This parameter stores the motor stator resistance for flux
vector control mode (see parameter
5.14
).
The stator resistance value is only read if
5.14
= 0.
If the stator resistance cannot be measured (motor not
connected, value higher than the max. rating) an "rS" trip
occurs.
During autotuning (
5.12
= 1 or 2), the value of the stator
resistance is automatically stored in
5.17
.
: Maximum switching frequency
Adjustment range : 0 to 5
Factory setting
: 1
Sets the PWM switching frequency.
WARNING:
A high switching frequency reduces the magnetic noise,
but it increases the motor temperature rise and the level
of radio-frequency interference emission, and reduces
the starting torque.
If the temperature of the IGBTs becomes too high, the
drive can reduce the switching frequency selected by the
user (see
5.35
and
10.18
).
: High stability modulation
Adjustment range : 0 or 1
Factory setting
: 0
0 (Disabled) (OFF): Function disabled.
1 (Enabled) (On): Function enabled. Instabilities can occur:
- at 50% of the motor rated frequency for an underloaded
motor
- around and above the motor rated speed, when the motor is
underloaded or very heavily loaded.
This function is used to eliminate these instabilities.
It also enables a slight reduction in the drive temperature rise.
However, using this mode may result in a slight increase in
motor noise.
: Quasi square output
Adjustment range : 0 or 1
Factory setting
: 0
0 (Disabled) (OFF): Function disabled.
1 (Enabled) (On): The maximum drive output voltage is
higher, resulting in an increase in motor torque. This is
beneficial for applications where it is desirable to reduce
speed pick-up times in the event of long cycles.
However, the motor torque may have slight ripples when it is
lightly loaded.
Function not available.
and
:Not used
: Voltage offset
Adjustment range : 0 to 25.5 volts
Factory setting
: 0
This voltage offset is measured by the drive (see parameter
5.14
). It is used to correct imperfections in the drive,
especially voltage drops in the IGBTs and idle times. This
parameter plays an important role in low-speed operation, i.e.
when the drive output voltage is low.
During autotuning (
5.12
= 1 or 2), the value of the voltage
offset is automatically stored in
5.23
.
: Transient inductance
Adjustment range : 0 to 3200.0 mH
Factory setting
: 0
During autotuning with rotation (
5.12
= 2), the transient
inductance is stored in this parameter.
: Stator inductance (Ls)
Adjustment range : 0 to 3200.0 mH
Factory setting
: 150.0 mH
This is the motor stator inductance at rated flux.
to
: Not used
: Motor torque per amp (Kt)
Adjustment range : 0.01 to 320.00 NmA
-1
Factory setting
: 1.00 NmA
-1
Indicates the motor torque per Amp of active current used to
calculate the drive speed loop gains (
3.17
= 1).
Function not available.
5.18
LCD display
LED display
0
3 kHz
3hH
1
4.5 kHz
4.5hH
2
5.5 kHz
5.5hH
3
6 kHz
6hH
4
9 kHz
9hH
5
11 kHz
11hH
5.15
Motor
voltage
5.09
5.06
Boost
Motor
frequency
5.09
5.06
2
2
5.15
(
)
5.16
5.17
5.18
5.19
5.20
5.21
5.22
5.23
5.24
5.25
5.26
5.31
5.32