Yaskawa Varispeed 626M5 - Manual (Page 189)

12.3 Inverter Faults
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12.3 Inverter Faults
If a fault occurs during operation, protective functions are activated depending on the fault and operation is
stopped. The contents of the faults are displayed on the Digital Operator (option) in AL code, and on the Invert-
er, 7-segment display display as the last two digits of the AL code.
As shown in the following diagram, the error codes (for stand-alone drives only) are shown as
f for ON and
F for OFF, using the signals output from pins 26 to 29 on 6CN.
Error code
6CN pin 26 (FC0)
6CN pin 27 (FC1)
6CN pin 28 (FC2)
6CN pin 29 (FC3)
(6CN pin 30 is the common.)
fFFf
Fig 12.1 Error Code Outputs
Table 12.2 Inverter Faults
Fault No. Name Contents Corrective Actions Error Code
Overcurrent
Output current exceeded overcurrent
detection value, or Inverter output
(load) was short-circuited.
Check the wiring for looseness,
etc.
Note) Before turning the power
ON again, make sure that no
short-circuit or ground fault oc-
curs at the Inverter output.
FFFF
Ground fault *
Inverter output side ground current
exceeded grounding detection level.
S Check the motor for deteriora-
tion of insulation.
S Check the wiring between In-
verter and motor.
Note) Before turning the power
ON again, make sure that no
short-circuit or ground fault oc-
curs at the Inverter output.
FFFF
Main circuit
fuse blown
DC circuit fuse was blown.
S Check for damage to transistor,
short-circuits on load side,
ground fault, etc.
S Check the Inverter output wir-
ing.
FFFF
Inverter output
overload Output current of 120% of 30-minute
rating runs for over one minute.
S Reduce the load.
S Check the load shaft (Inverter,
Servo) capacity.
FFFF
Motor over-
load
Motor overload capacity exceeded. Reduce the load. FFFF
Motor Over-
load (When the
motor is
locked)
The motor exceeded the overload
level at low speed (30 min
−1 or less).
S Check if the load is heavy or a
tool is jammed.
S Make sure that the motor shaft
rotates. (Check if a motor fault
or a contact between the rotor
and the stator occurs, or if a
bearing is damaged.)
FFFF
Converter fault A fault occurred in Converter Unit.
Check fault contents by using
Converter LED.
FFFf
Main circuit
overvoltage
Main circuit DC bus voltage exceed-
ed the overvoltage set value.
S Check the input supply voltage.
S Check the load shaft (Inverter,
Servo) capacity.
S Check the control constants.
FFFf
* The ground fault here is one which occurs in the motor wiring while the motor is running.
A ground fault may not be detected in the following cases.
¯
A ground fault with low resistance which occurs in motor cables or terminals.
¯ A ground fault occurs when the power is turned ON.
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