44
Commander SE Advanced User Guide
Issue Number: 4
The rated full load rpm is used with the motor rated frequency and No. of poles to calculate the rated slip of the induction
machine in Hz.
Rated slip
= motor rated frequency - (No. of pole pairs x motor full load rpm / 60)
=
5.06
- ((
5.11
/ 2) x
5.08
/ 60)
The rated slip is used to calculate the frequency adjustment required to compensate for slip from the following equation:
Slip compensation
= rated slip x active current / rated active current
If slip compensation is required this parameter should be set to the name-plate value, which should give the correct rpm for a
hot machine.
Sometimes it will be necessary to adjust this when the drive is commissioned because the nameplate value might be
inaccurate. Slip compensation will operate correctly for below base speed and field weakening operation. Slip compensation
is used to prevent a “droop” in motor shaft speed as load is applied. If the motor full load speed is set below the synchronous
speed, the slip compensation will increase the output frequency with a motoring load and decrease the frequency with a
regenerative load both operating in the forward direction. The opposite is true for reverse direction.
A value of zero entered into parameter 07 means slip compensation is disabled
If the full load speed of the motor is above 9999rpm, enter a value of 0 in parameter 07. This will disable slip
compensation as values greater than 9999 cannot be entered into this parameter.
Slip compensation should be disabled when using Commander SE on a high inertia load, e.g. fan.
This voltage is used in conjunction with the motor rated frequency
5.06
to define the voltage to frequency characteristic
applied to the machine. If fixed boost is selected (
5.14
= 2) the following characteristic is used.
If vector mode is selected (
5.14
= 0 or 1) the voltage characteristic is a function of the stator resistance (
5.17
), voltage offset
(
5.23
) and power factor (
5.10
), all are required to be set up accurately for optimum performance. At no load, the output
voltage will be equal to the rated voltage at the rated frequency.
5.08
Motor rated full load rpm
Ú
0 ~ 9999
Ö
Eur> 1500
USA> 1800
rpm
RW
Uni
5.09
Motor rated voltage
EUR: 50Hz Defaults
Ú
400V units > 0 ~ 480
200V units> 0 ~ 240
Ö
400V units> 400
200V units> 230
V
RW
Uni
USA: 60Hz Defaults
Ú
400V units > 0 ~ 480
200V units > 0 ~ 240
Ö
400V units> 460
200V units> 230
V
RW
Uni
NOTE
NOTE
NOTE
voltage boost
output
voltage
05.09
05.09 / 2
05.06 / 2
05.06
output
frequency
Output voltage characteristic
Содержание COMMANDER SE
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Страница 142: ...142 Commander SE Advanced User Guide Issue Number 4 Figure 6 9 Input line reactor 4400 0241 All dimensions in mm...
Страница 144: ...144 Commander SE Advanced User Guide Issue Number 4 Figure 7 3 Commander SE Size 4 All dimensions in mm...