Inverter Faults - YASKAWA VS-626M5 Instruction Manual

Vector-controlled inverter drives with power regenerative function for machine tools
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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
for OFF, using the signals output from pins 26 to 29 on 6CN.
F
Fig
Table 12.2
Fault No.
Name
Overcurrent
Ground fault *
Main circuit
fuse blown
Inverter output
overload
Motor over-
load
Motor Over-
load (When the
motor is
locked)
Converter fault
Main
overvoltage
*
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.
Error code
fFFf
6CN pin 26 (FC0)
6CN pin 27 (FC1)
6CN pin 28 (FC2)
6CN pin 29 (FC3)
12.1
Error Code Outputs
Inverter Faults
Contents
Output current exceeded overcurrent
detection value, or Inverter output
(load) was short-circuited.
Inverter output side ground current
exceeded grounding detection level.
DC circuit fuse was blown.
Output current of 120% of 30-minute
rating runs for over one minute.
Motor overload capacity exceeded.
The motor exceeded the overload
level at low speed (30 min
A fault occurred in Converter Unit.
circuit
Main circuit DC bus voltage exceed-
ed the overvoltage set value.
12 - 5
(6CN pin 30 is the common.)
Corrective Actions
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.
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.
S Check for damage to transistor,
short-circuits on load side,
ground fault, etc.
S Check the Inverter output wir-
ing.
S Reduce the load.
S Check the load shaft (Inverter,
Servo) capacity.
Reduce the load.
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
−1
or less).
or a contact between the rotor
and the stator occurs, or if a
bearing is damaged.)
Check fault contents by using
Converter LED.
S Check the input supply voltage.
S Check the load shaft (Inverter,
Servo) capacity.
S Check the control constants.
12.3 Inverter Faults
for ON and
f
12
Error Code
FFFF
FFFF
FFFF
FFFF
FFFF
FFFF
FFFf
FFFf

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