Fuji Electric FRENIC-ECO, Инструкция по эксплуатации

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6-9
Possible Causes What to Check and Suggested Measures
(4) The value set for torque
boost (F09) was too large.
(F37 = 0, 1, 3, or 4)
Check that the output current decreases and the motor does not come to
stall if you set a lower value than the current one for F09.
Î Lower the value for torque boost (F09) if the motor is not going to stall.
(5) The acceleration/
deceleration time was too
short.
Check that the motor generates enough torque required during
acceleration/deceleration. That torque is calculated from the moment of
inertia for the load and the acceleration/deceleration time.
Î Increase the acceleration/deceleration time (F07 and F08).
Î Enable current limitig (F43).
Î Raise the inverter capacity.
(6) Malfunction caused by
noise
Check if noise control measures are appropriate (e.g., correct grounding and
routing of control and main circuit wires).
Î Implement noise control measures. For details, refer to "Appendix A" of
the FRENIC-Eco User’s Manual.
Î
Enable the auto-resetting (H04).
Î Connect a surge absorber to the coil or solenoid of the magnetic contactor
causing the noise.
[ 2 ] ef Ground fault (125 HP or above)
Problem A ground fault current flew from the output terminal of the inverter.
Possible Causes What to Check and Suggested Measures
(1) The output terminal of
the inverter is
short-circuited to the
ground (ground fault, or
earthed).
Disconnect the wires from the output terminals ([U], [V], and [W]) and perform
a megger test.
Î Remove the earthed path (including the replacement of the wires, the
terminals, or the motor as necessary).
[ 3 ]
0u
n Overvoltage
Problem The DC link bus voltage was over the detection level of overvoltage.
0u1 Overvoltage occurs during the acceleration.
0u2 Overvoltage occurs during the deceleration.
0u3
Overvoltage occurs during running at constant speed.
Possible Causes What to Check and Suggested Measures
(1) The power supply voltage
was over the range of the
inverter’s specifications.
Measure the input voltage.
Î Decrease the voltage to within that of the specifications.
(2) A surge current entered
the input power source.
If within the same power source a phase-advancing capacitor is turned ON
or OFF or a thyristor converter is activated, a surge (temporary precipitous
rise in voltage or current) may be caused in the input power.
Î Install a DC reactor.
(3) The deceleration time was
too short for the moment
of inertia for load.
Recalculate the deceleration torque from the moment of inertia for load and
the deceleration time.
Î Increase the deceleration time (F08).
Î Enable the regenerative braking (H69 = 3), or automatic deceleration
(H71 = 1).
Î Set the rated voltage (at base frequency) (F05) to "0" to improve braking
ability.
(4) The acceleration time was
too short.
Check if the overvoltage alarm occurs after rapid acceleration.
Î Increase the acceleration time (F07).
Î Select the S-curve pattern (H07).