Mitsubishi Electric FR-A700 Series, Техническое руководство

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296
PARAMETER
2.9.8 Troubleshooting (speed control)
(A700)
A700
Case Cause Countermeasures
1
Motor does not
rotate.
(vector control)
(1) The motor wiring is wrong (1) Wiring check
V/F control (set 9999 in either [
Pr. 80
] or [
Pr. 81
]) and
check the motor rotation direction.
Check the speed monitor output from output terminal FM.
For the FR-V5RU, set 170V for 3.7kW or less and 160V
for more in [
Pr. 19 Base frequency voltage
], and set 50Hz in
[
Pr. 3 Base frequency
].
When the forward rotation signal is
input, the motor running in the
counterclockwise direction as viewed
from the motor shaft is normal. (If it runs
in the clockwise direction, the phase
sequence of the inverter secondary side
wiring is incorrect.)
(2) Encoder specifications (encoder specification
selection switch (FR-A7AP, FR-A7AL)) are wrong
(2) Check the encoder specifications
Check the encoder specifications selection switch (FR-
A7AP, FR-A7AL) of differential/complementary.
(3) The encoder wiring is wrong. (3) Check that FWD is displayed when running the motor in
the counterclockwise direction from outside during a stop
of the inverter with vector control setting.
If REV is displayed, the encoder phase sequence is
wrong.
Perform the correct wiring or match the [
Pr. 359 Encoder
rotation direction
] setting.
(4)The [ Pr. 369 Number of encoder pulses ] setting and
the number of encoder pulses used are
different.
(4) The motor will not run if the parameter setting is smaller
than the number of encoder pulses used. Set the [ Pr. 369
Number of encoder pulses ] correctly.
(5) Encoder power specifications are wrong. Or, power
is not input.
(5) Check the power specifications (5V/12V/15V/24V) of
encoder and input the external power supply.
2
Motor does not run
at correct speed.
(Speed command
does not match
actual speed)
(1) The speed command from the command
device is incorrect.
The speed command is compounded with noise.
(1) Check that a correct speed command comes from the
command device.
Decrease [
Pr. 72 PWM frequency selection ] .
(2) The speed command value does not match the
inverter-recognized value.
(2) Readjust speed command bias/gain [ Pr. 125, 126, C2 to
C7, C12 to C15 ].
(3) The number of encoder pulses setting is
incorrect.
(3)Check the setting of [ Pr. 369 Number of encoder pulses ].
(vector control)
3
Speed does not
rise to the speed
command.
(1) Insufficient torque.
Torque limit is activated.
(1)-1
(1)-2
Increase the torque limit value.
(Refer to torque limit of speed control on page 283)
Insufficient capacity
(2) Only P (proportional) control is selected. (2) When the load is heavy, speed deviation will occur under
P (proportional) control. Select PI control.
[ Pr. 359 ] Setting
Relationship between the
Motor and Encoder
0
1
(initial value)
A
Encoder
CW
Clockwise direction as viewed
from A is forward rotation
CCW
A
Encoder
Counterclockwise direction as
viewed from A is forward rotation