YASKAWA CIPR-GA70C Series Initial Steps page 30

13 Faults and Alarms
EF FWD/REV Run Command
Input Error
EF1 to EF8 External Fault (Terminal
Sx)
GF Ground Fault
oC Overcurrent
oL1 Motor Overload
oL2 Drive Overload
ov Overvoltage
PF Input Phase Loss
EN 30
A forward command and a reverse
command were input at the same time
for longer than 500 ms.
One of the digital inputs caused an
external fault through an external
device.
The digital input settings are incorrect.
A current short to ground was more than
50% of the rated current on the output
side of the drive.
The motor wiring or insulation are
damaged.
Too much parasitic capacitance at drive
output.
• There is a short circuit or ground fault
on the drive output side.
• The load is too heavy.
• The accel/decel times are too short.
• The motor data is incorrect.
• The V/f pattern settings are incorrect.
• A magnetic contactor was switched at
the output.
The motor load is too heavy.
Operating a general-purpose motor
slower than the rated speed with a high
load.
Cycle times are too short during
acceleration and deceleration.
The motor rated current setting is
incorrect.
• The load is too heavy.
• The drive capacity is too small.
• Torque is too high at low speed.
• The DC bus voltage is too high.
• The deceleration time is too short.
• Stall prevention is disabled.
• The braking resistor is missing or
damaged.
• Motor control is not stable.
• The input voltage is too high.
Drive input power has an open phase.
The drive input power terminals are not
tight.
Too much fluctuation in the drive input
power voltage.
YASKAWA ELECTRIC TOEP C710617 17D YASKAWA AC Drive GA700 Initial Steps
Make sure that the sequence is correct. Do not set
the forward and reverse inputs at the same time.
• Find the device that caused the external faults.
Remove the cause and reset the fault.
• Make sure that the digital input terminal
functions are correct.
• Make sure that the output wiring is correct.
• Make sure that the motor does not have short
circuits or damaged insulation.
Replace damaged parts.
Reduce the carrier frequency in C6-02 [Carrier
Frequency Selection].
• Replace damaged output wiring and motor
wiring.
• Repair damaged machine parts.
• Make sure that the drive parameter settings are
correct.
• Make sure that the output contactor sequence is
correct.
Decrease the motor load.
Use a motor with external cooling and set the
correct motor type in L1-01 [Motor Overload (oL1)
Protection].
Increase the acceleration and deceleration times.
Make sure that the motor rated current in E2-01
[Motor Rated Current (FLA)] is correct.
• Examine the load.
• Make sure that the drive is sufficiently large for
the load.
• The overload capability of the drive decreases at
low speeds. Decrease the load or replace the
drive with a larger capacity model.
• Increase the deceleration time.
• Set L3-04 [Stall Prevention during Decel] ≠ 0 to
enable stall prevention.
• Replace the braking resistor.
• Make sure that motor parameter settings are
correct and adjust torque and slip compensation
if necessary.
• Make sure that the power supply voltage meets
drive specifications.
Correct all wiring errors in the main circuit drive
input power.
Tighten the terminals to the correct tightening
torque.
• Measure the voltage from the drive input power.
• Make the drive input power stable.