6.3 If an Alarm Code Appears on the LED Monitor
6-26
[ 37 ] 0pl Output phase-failure detection
Phenomenon: Output phase loss occurred.
(1) Inverter output wires are
broken.
Measure the inverter output current.
➔ Replace the output wires.
(2) The motor winding is broken.
Measure the inverter output current.
➔ Replace the motor.
(3) The terminal screws for inverter
output were not tight enough.
Check if any screws on the inverter output terminals have become
loose.
➔ Tighten the terminal screws to the recommended torque.
(4) A single-phase motor has been
connected.
➔ The inverter cannot be used. FRENIC-MEGA has been designed for
driving three-phase induction motors and synchronous motors.
[ 38 ] 0s Overspeed protection
Phenomenon: Motor rotated at excessive speed (When motor speed ≥ (F03 x 1.2))
(1) Incorrect setting of function code
data.
Check the motor parameter “Number of poles” (P01*).
➔ Specify the P01* data in accordance with the motor to be used.
Check the maximum frequency setting (F03*).
➔ Specify the F03* data in accordance with the output frequency.
Check the speed limiting function (d32, d33) setting.
➔ Disable the speed limiting function (d32, d33).
Check the overspeed detection level (d35) setting.
➔ Set the overspeed detection level (d35) to 120%.
(2) The speed regulator gain is
insufficient.
Check whether the speed has overshot when performing high-speed
operation.
➔ Increase the speed regulator gain (d03*).
(Depending on the situation, it may be necessary to change the
filters or adjust the integral time.)
(3) Noise is superimposed on the
PG signal.
Check the PG signal input monitor, and check noise countermeasures
(grounding condition, signal line/main circuit wiring installation method,
etc.)
➔ Take noise countermeasures. For details, refer to Appendix A.
(4) The output frequency and motor
rotation speed exceeded 599
Hz.
If running the motor near 599 Hz, check whether the acceleration time is
too short, whether there are any load fluctuations. and whether the
speed regulator gain (d03*) and integral time (d04*) are appropriate.
➔ Reduce the operating frequency.
The explanations for function codes with an asterisk (*) are limited to motor 1. If using motor 2 to 4, replace
with the relevant function codes in Chapter 5 "Table 5.3-21 Function codes to be switched".
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