Optidrive E3 Set-up Guide
P a g e
|
39
14
Motor Control Parameters
Low frequency torque boost – Parameter P-11
Low frequency torque boost is used to increase the applied motor voltage and hence motor current & torque
at low motor output frequencies.
In most applications, the default boost setting along with simple vector
mode is adequate to provide good starting torque performance.
Increasing the low frequency torque boost can improve low speed starting torque especially on high starting
torque loads e.g. loaded conveyors or mixers etc. It can also improve low speed torque in applications where
high levels of low speed torque is required.
In general, the lower the motor power, the higher the boost setting require although caution must be taken
not to set the boost value too high.
A method for achieving a suitable setting for low frequency torque boost is to run the motor at 0Hz and adjust
parameter P-11 until the motor current is approximately the motor magnetizing current (if known) or as
suggested in the table or in the range as shown below:
Model Number
Frame
size
Input
voltage
Number
of input
phases
Output
voltage
kW
Motor rated
current in
P-08 (A)
Suggested magnetising
current value (A)
ODE-3-120023-1F1#
1
200 to
240VAC
±10%
1
0 to
230V
(250V
max)
0.37
2.3
1.4
ODE-3-120043-1F1#
1
0.75
4.3
2.5
ODE-3-120070-1F1#
1
0.75
7.0
4.2
ODE-3-220070-1F4#
2
1.5
7.0
4.2
ODE-3-220105-1F4#
2
2.2
10.5
5.2
ODE-3-320153-1#4#
3
4
15.3
7.2
ODE-3-140022-3F1#
1
380 to
480VAC
±10%
3
0 to
400V
(500V
max)
0.75
2.2
1.3
ODE-3-140041-3F1#
1
1.5
4.1
2.4
ODE-3-240041-3F4#
2
1.5
4.1
2.4
ODE-3-240058-3F4#
2
2.2
5.8
2.9
ODE-3-240095-3F4#
2
4
9.5
4.4
ODE-3-340140-3F4#
3
5.5
14
6.5
ODE-3-340180-3F4#
3
7.5
18
8.1
ODE-3-340240-3F4#
3
11
24
10.5
ODE-3-340300-3F4#
4
15
30
14.0
ODE-3-340390-3F4#
4
18.5
39
18.2
ODE-3-340460-3F4#
4
22
46
21.5
ODE-3-440610-3F42
5
30
61
27.6
ODE-3-440720-3F42
5
37
72
31.5
NOTE:
The above magnetizing current figures are based on the drives maximum motor rated current value set
in P-08. These values may need adjusting based on the actual motor rated current.
E3 frame size 1: 60% to 80% of motor rated current
E3 frame size 2: 50% to 60% of motor rated current
E3 frame size 3: 40% to 50% of motor rated current
E3 frame size 4: 35% to 45% of motor rated current
E3 frame size 5: 35% to 45% of motor rated current
Caution:
If the low frequency torque boost is increased too high, the motor can be over magnetised and this
will cause the motor to stall while trying to start the load.
