Check first when you have a trouble
654
6.5.12
Speed does not accelerate
6.5.13
Unable to write parameter setting
6.5.14
Power lamp is not lit
Check
points
Possible cause
Countermeasure
Refer to
page
Input
signal
Start command and frequency command are
chattering.
Check if the start command and the frequency command are
correct.
―
The wiring length used for analog frequency
command is too long, and it is causing a
voltage (current) drop.
Perform Analog input bias/gain calibration.
The 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 Maximum frequency, Pr.2 Minimum
frequency, Pr.18 High speed maximum
frequency, and Pr.902 to Pr.905
settings are
improper.
Check the settings of
Pr.1 and Pr.2
and set
Pr.18
.
Check the
Pr.902 to Pr.905
settings.
The maximum voltage (current) input value is
not set during the External operation.
(Pr.125,
Pr.126, Pr.18)
Check the settings of
Pr.125 Terminal 2 frequency setting
gain frequency
and
Pr.126 Terminal 4 frequency setting
gain frequency
.
To operate at 120 Hz or higher, set
Pr.18 High speed
maximum frequency
.
,
Torque boost
(Pr.0, Pr.46, Pr.112)
setting is
improper under V/F control, so the stall
prevention function is activated.
Increase/decrease the
Pr.0 Torque boost
setting value by
0.5% increments so that stall prevention does not occur.
V/F pattern is improper when V/F control is
performed.
(
Pr.3, Pr.14, Pr.19
)
Set rated frequency of the motor to
Pr.3 Base frequency
.
Use
Pr.19 Base frequency voltage
to set the base voltage (for
example, rated motor voltage).
Change
Pr.14 Load pattern selection
according to the load
characteristic.
Stall prevention (torque limit) function is
activated due to a heavy load.
Reduce the load weight.
―
Set
Pr.22 Stall prevention operation level (torque limit level)
higher according to the load. (If
Pr.22
is set too high, an
overcurrent trip (E.OC[]) is likely to occur.)
,
Check the capacities of the inverter and the motor.
―
Auto tuning is not performed under Advanced
magnetic flux vector control, Real sensorless
vector control, or vector control.
Perform offline auto tuning.
The setting of pulse train input is improper.
Check the specification of the pulse generator (open collector
output or complementary output) and check the adjustment of
the pulse train and frequency (
Pr.385 Frequency for zero
input pulse
and
Pr.386 Frequency for maximum input
pulse
).
During PID control, output frequency is automatically controlled to make measured value = set point.
Main
circuit
A brake resistor is connected across terminals
P3(P/+) and P1 or across P1 and PR by mistake.
Connect a brake resistor across terminals P3(P/+) and PR.
Check
points
Possible cause
Countermeasure
Refer to
page
Input
signal
Operation is being performed (signal STF or
STR is ON).
Stop the operation.
When
Pr.77
Parameter write selection
= "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 Parameter write selection
= "2" to enable
parameter write regardless of the operation mode.
,
Parameter write is disabled by the
Pr.77
Parameter write selection
setting.
Check the
Pr.77
setting.
Operation mode and a writing device do not
correspond.
Check
Pr.79, Pr.338, Pr.339, Pr.550
and
Pr.551
, and select an
operation mode suitable for the purpose.
,
Check
points
Possible cause
Countermeasure
Refer to
page
Main
circuit
Control
circuit
Wiring or installation is improper.
Check for the wiring and the installation.
Power lamp is lit when power is supplied to the control circuit
(R1/L11, S1/L21).
Summary of Contents for 800 Series
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