EN 30
YASKAWA ELECTRIC
TOEP C710617 17B YASKAWA AC Drive GA700 Initial Steps
EF
FWD/REV Run Command
Input Error
A forward command and a reverse
command were input at the same time
for longer than 500 ms.
Make sure that the sequence is correct. Do not set
the forward and reverse inputs at the same time.
EF1 to EF8 External Fault (Terminal
Sx)
One of the digital inputs caused an
external fault through an external
device.
The digital input settings are incorrect.
•
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.
GF
Ground Fault
A current short to ground was more than
50% of the rated current on the output
side of the drive.
•
Make sure that the output wiring is correct.
•
Make sure that the motor does not have short
circuits or damaged insulation.
The motor wiring or insulation are
damaged.
Replace damaged parts.
Too much parasitic capacitance at drive
output.
Reduce the carrier frequency in
C6-02 [Carrier
Frequency Selection]
.
STo
Safe Torque OFF
The two Safe Disable inputs are open.
The drive output is safely disabled and
the motor will not start.
•
Find the problem causing the host controller
safety device to disable the drive.
•
If the Safe Disable function does not disable the
drive or if it is not used for the ISO/EN 13849-1
(PL e (Cat.III)), and IEC/EN 61508 (SIL3),
connect a jumper between terminals HC, H1,
and H2.
SToF
Safe Torque OFF Hardware
Opening only one Safe Disable input
disables drive output. (Usually inputs
H1 and H2 must open to disable drive
output.)
•
One input is damaged and will not
switch off after removing the external
signal.
•
The host controller switched off one
input.
•
Make sure that the wiring from the host
controller is correct and the controller set the two
signals correctly.
•
If the signals are correct and the alarm continues
to occur, replace the drive.
oC
Overcurrent
•
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.
•
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.
oL1
Motor Overload
The motor load is too heavy.
Decrease the motor load.
Operating a general-purpose motor
slower than the rated speed with a high
load.
Use a motor with external cooling and set the
correct motor type in
L1-01 [Motor Overload (oL1)
Protection]
.
Cycle times are too short during
acceleration and deceleration.
Increase the acceleration and deceleration times.
The motor rated current setting is
incorrect.
Make sure that the motor rated current in
E2-01
[Motor Rated Current (FLA)]
is correct.
oL2
Drive Overload
•
The load is too heavy.
•
The drive capacity is too small.
•
Torque is too high at low speed.
•
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.
ov
Overvoltage
•
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.
•
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.
