270
Check first when you have a trouble
5.5.12 Speed does not accelerate
5.5.13 Unable to write parameter setting
Check
Points
Possible Cause
Countermeasures
Refer
to
Page
Input
Signal
Start command and speed command are chattering.
Check if the start command and the speed command
are correct.
—
The wiring length used for analog speed command is
too long, and it is causing a voltage (current) drop.
Perform analog input bias/gain calibration.
Input signal lines are affected by external EMI.
Take countermeasures against EMI, such as using
shielded wires for input signal lines.
Parameter
Setting
Pr. 1, Pr. 2, calibration parameter C2 to C7
settings are
improper.
Check the settings of
Pr. 1 Maximum setting
and
Pr. 2
Minimum setting
.
Check the
calibration parameter C2 to C7
settings.
The maximum speed is limited to the maximum speed of
the PM motor.
The maximum voltage (current) input value is not set
during the External operation.
(Pr. 125, Pr. 126)
Check the
Pr. 125 Terminal 2 speed setting gain speed
and
Pr. 126 Terminal 4 speed setting gain speed
settings.
Stall prevention function is activated due to a heavy
load.
Reduce the load weight.
—
Set
Pr. 22 Stall prevention operation level
higher according
to the load. (Setting
Pr. 22
too large may result in
frequent overcurrent trip (E.OC
).)
Check the capacities of the drive unit and the motor.
—
Offline auto tuning is not performed when driving a
motor other than S-PM geared motor.
Perform offline auto tuning.
During PID control, rotation speed is automatically controlled to make measured value = set point.
Main
Circuit
Brake resistor is connected between terminal P/+ and
P1 by mistake.
Connect an optional brake transistor (MRS type, MYS
type, FR-ABR) between terminal P/+ and PR.
Check
Points
Possible Cause
Countermeasures
Refer
to
Page
Input
Signal
Operation is being performed (signal STF or STR is
ON).
Stop the operation.
When
Pr. 77
= "0" (initial value), write is enabled only
during a stop.
Parameter
Setting
You are attempting to set the parameter in the External
operation mode.
Choose the PU operation mode.
Or, set
Pr. 77
= "2" to enable parameter write regardless
of the operation mode.
Parameter is disabled by the
Pr. 77 Parameter write
selection
setting.
Check
Pr. 77 Parameter write selection
setting.
Key lock is activated by the
Pr. 161 Speed setting/key lock
operation selection
setting.
Check
Pr. 161 Speed setting/key lock operation selection
setting.
Operation mode and a writing device do not
correspond.
Check
Pr. 79, Pr. 338, Pr. 339, Pr. 551,
and select an
operation mode suitable for the purpose.
Содержание FR-D720-0.2K-G
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Страница 294: ...291 APPENDIX This chapter provides the APPENDIX of this product Always read the instructions before using the equipment ...
