617
6. PROTECTIVE FUNCTIONS
6.6 Check first when you have a trouble
1
2
3
4
5
6
7
8
9
10
6.6.8 Speed varies during operation
Under Advanced magnetic flux vector control, the output frequency varies between 0 and 2 Hz as the load fluctuates. This is
a normal operation and not a fault.
6.6.9 Operation mode is not changed properly
Check
point
Possible cause Countermeasure
Refer to
page
Load The load varies during an operation. Select Advanced magnetic flux vector control. 177
Input
signal
The frequency setting signal is varying. Check the frequency setting signal. —
The frequency setting signal is affected by
EMI.
Set filter to the analog input terminal using Pr.74 Input filter time
constant, Pr.822 Speed setting filter 1, etc.
355
Take countermeasures against EMI, such as using shielded wires
for input signal lines.
93
A malfunction is occurring due to the
undesirable current generated when the
transistor output unit is connected.
Use terminal PC (terminal SD when source logic) as a common
terminal to prevent a malfunction caused by undesirable current.
65
A multi-speed command signal is
chattering.
Take countermeasures to suppress chattering. —
Parameter
setting
Fluctuation of power supply voltage is too
large.
Under V/F control, change the Pr.19 Base frequency voltage
setting (approximately by 3%).
552
The Pr.80 Motor capacity and Pr.81
Number of motor poles settings are not
appropriate for the motor capacity under
Advanced magnetic flux vector control or
PM motor control.
Check the settings of Pr.80 and Pr.81. 177
Wiring length exceeds 30 m when
Advanced magnetic flux vector control or
PM motor control is performed.
Perform offline auto tuning 383
Under V/F control, wiring is too long and a
voltage drop occurs.
In the low-speed range, adjust the Pr.0 Torque boost setting by
0.5% increments.
551
Change the control method to Advanced magnetic flux vector
control.
177
Hunting occurs by the generated vibration,
for example, when structural rigidity of the
load is insufficient.
Disable automatic control functions, such as energy saving
operation, fast-response current limit function, regeneration
avoidance function, Advanced magnetic flux vector control, stall
prevention, and online auto tuning.
For PID control, set smaller values to Pr.129 PID proportional
band and Pr.130 PID integral time.
Lower the control gain to increase the stability.
—
Change the Pr.72 PWM frequency selection setting. 218
Check
point
Possible cause Countermeasure
Refer to
page
Input
signal
The start signal (STF or STR) is ON.
Check that the STF and STR signals are OFF.
When either is ON, the operation mode cannot be changed.
60, 563
Parameter
setting
The Pr.79 Operation mode selection
setting is not appropriate.
When the Pr.79 is set to "0 (initial value)", the operation mode is the
External operation mode at power ON. To switch to the PU
operation mode, press the key on the operation panel
(press the key on the parameter unit (FR-PU07)). At other
settings (1 to 4, 6, 7), the operation mode is limited accordingly.
240
Operation mode and a writing device do not
correspond.
Check Pr.79 Operation mode selection, Pr.338 Communication
operation command source, Pr.339 Communication speed
command source, Pr.550 NET mode operation command
source selection and Pr.551 PU mode operation command
source selection, and select an operation mode suitable for the
purpose.
240, 251
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