may require fine tuning. For a motor of frame
size different to that of the inverter, Functions
71 and 72 will require adjustment.
For Function 71, use the rating plate data.
Function 72 can be approximated from:
Io = Ir x
√
[1 - (cos
φ
)
2
]
Motor 2 only.
Setting range
0.01 to 99.9 amps
For a standard 4-pole motor. Selected when
Function 62, base frequency 2, is active.
Motor 1 only.
Setting range
0 = Inactive
1 = Active
Provides for auto-tuning the inverter to the pri-
mary resistance and the leakage reactance of a
motor and its cable. The motor must be cor-
rectly connected to the inverter, and the invert-
er must be in STOP mode. Set Function 74 =
1 and press the FUNC/DATA key. Tuning
will be completed in about 10 seconds. The
display reads ‘F 75’ when tuning is complete.
The results of the auto-tuning can be inspected
and changed in Functions 75 and 76 if desired.
NOTES
1 It is essential that motor 1 capacity,
Function 70, is correctly set prior to tuning.
2 If BX-P24 is closed, auto-tuning is not
possible.
3 If the auto-tuning procedure is not success-
ful (may happen with non-standard
motors), code Er7 will be displayed on the
keypad. In this event, tune manually using
Functions 75 and 76.
4 The Jaguar VXS does not measure motor
magnetising current (entered manually,
Function 72), therefore the motor does not
rotate during tuning.
5 Auto-tuning may be unsuccessful, and
manual tuning will be required if:
a) the motor line is open-circuited;
b) the motor line length is >50m;
c) output inductors are fitted.
Motor 1 only.
Setting range
0.00 to 50.0% in steps of 0.01%
NOTE The R
1
and R
cable
values for a motor
and its supply cable can be directly mea-
sured (star or delta) using a multimeter.
This Function allows the manual insertion of a
value for the percentage resistive impedance
of the motor. If Function 74, auto-tuning, is
used first and is successful the %R value will
be shown in Function 75.
To calculate %R, the following expression
may be used (for star-connected motors):
%R =
√
3 . I . (R
1
+ R
cable
)
x 100
V
where
I is the rated full load current of a
star-connected motor,
V is the motor rated voltage,
Function 05, (= line voltage V
L
)
and
R
1
and R
cable
values are in ohms.
Setting range
0.00 to 50.0% in steps of 0.01%
NOTE The results of tuning to the primary
reactance are stored in Function 76 and can
be examined after the auto-tune function.
However, if necessary, the %X value can
be calculated and entered manually into
Function 76.
Users are advised to consult the manufacturer
of the motor to obtain the motor ‘equivalent
circuit’ parameters to use as shown in the
example on the following page.
41
73 Motor 2 rated current
74 Automatic tuning
75 Impedance %R setting
76 Impedance %X setting
CAUTION %R and %X should be set to
values appropriate for the motor to be
used, otherwise the motor may not
operate correctly and there may be a
risk of damage.
Function 75 — %R
Function 76 — %X
Содержание Jaguar VXS
Страница 1: ......
