Mitsubishi Electric FR-D720-0.2K-G, Инструкция по эксплуатации

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82
Special adjustment function
4.4 Special adjustment function
4.4.1 Motor wiring resistance adjustment (Pr. 658)
....... Specifications differ according to the date assembled. Refer to page 294 to check the SERIAL number.

The motor wiring resistance can be set. The set value is calculated from the following formula.
Wiring resistance = Resistance per 1m (

)

Wiring length (m)
Reference value

For special size cables, the value is calculated from the following formula.
4.4.2 Adjustment for motor long-wiring (Pr. 643)
.......Specifications differ according to the date assembled.
Refer to page 294
to check the SERIAL number.

For special size cables, refer to the following table to set the value.

Differs depending on the cross section area, type, or laying of cable.

If an unstable movement or error is not corrected, adjust the setting by decreasing the setting value by 5% to about 50%, as
a reference.

If an unstable movement or error persists after the setting value is decreased to less than 50%, it may be caused by
interference from the machines due to high responsivity of the motor. After changing the setting value of
Pr. 643 to the
reference value in the table above, adjust the setting by decreasing the response level of control gain set in
Pr. 820 Speed
control P gain or Pr. 821 Speed control integral time .
Purpose Parameter to Set Refer to Page
To improve the acceleration/
deceleration characteristics
Wiring resistance Pr. 658
82
To reduce the unstable movements or
the error occurrence Voltage compensation
amount setting
Pr. 643
82
Adjust if acceleration/deceleration characteristics are unstable. In normal condition, the setting is not required.
Parameter
Number
Name
Initial
Value
Setting Range Description
658 Wiring resistance
9999
0 to 5

Set the motor wiring resistance. PM sensorless vector
control is performed with the resistance that is sum of the
value for motor alone set in
Pr. 71 Applied motor and the
setting value of Pr. 658 .
9999
The motor wiring resistance calculated by the drive unit is
set. PM sensorless vector control is performed with the
calculated resistance.
Cable Size
Resistance
per 1m (

)
Resistance in the Wiring Length (

)
HIV Cables,
etc. (mm
2
)
AWG 1m 2m 5m 10m 20m 30m
0.75 19 0.029100 0.029 0.058 0.146 0.291 0.582 0.873
0.75 18 0.021800 0.022 0.044 0.109 0.218 0.436 0.654
2 14 0.008573 0.009 0.017 0.043 0.086 0.171 0.257
3.5 12 0.004926 0.005 0.010 0.025 0.049 0.099 0.148
R (

) =


(

: constant 1.7241

10
-2
(


mm
2
/m) (copper wire), A: cross section area (mm
2
), : length (m))
A
Adjust if the motor rotation is unstable or an error occurs when the high-response operation is set for control gain
of the motor having a long wiring.
Parameter
Number
Name
Initial
Value
Setting Range Description
643
Voltage
compensation
amount setting
9999
0 to 150%
Set this parameter according to the motor wiring length. For
setting values, refer to the table below.
9999
Disabled
Motor Wiring Length Less than 10m 10 to 15m 15 to 20m 20 to 25m 25 to 30m
Reference setting value
of Pr. 643

9999 85% 75% 65% 60%