Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 173)

PC NC Maintenance Manual The VS-626M5
4-152
Table 4.37: Fault Diagnosis and Inverter Corrective Actions
Fault Number Name Contents Corrective Action Fault Code
Overcurrent Output current exceeded
overcurrent detection value, or
inverter output (load) was
short-circuited. Check for loose wires. _œ_œ_œ_œ
Ground fault Inverter output side ground
current exceeded grounding
detection level. Check the motor for deteriora-
tion of insulation.
Check the wiring between
inverter and motor. _œ_œ_œ_œ
Main circuit fuse
blown DC circuit fuse was blown. Check for damage to transistor,
short-circuits on load side,
ground fault, etc.
Check the inverter output wir-
ing. _œ_œ_œ_œ
Inverter output
overload Output current of 120% of 30-
minute rating runs for over
one minute. Reduce the load.
Check the load shaft (inverter,
servo) capacity. _œ_œ_œ_œ
Motor overload Motor overload capacity
exceeded. Reduce the load. _œ_œ_œ_œ
Converter fault A fault occurred in the con-
verter unit. Check fault contents by using
converter LED. _œ_œ_œ_›
Main circuit over-
voltage Main circuit DC bus voltage
exceeded the overvoltage set
value. Check the input supply voltage.
Check the load shaft (inverter,
servo) capacity.
Check the control constants. _œ_œ_œ_›
Main circuit under-
voltage Main circuit DC bus voltage
became lower than undervolt-
age detection level during run. Check the input supply voltage. _œ_œ_œ_›
Control circuit und-
ervoltage Control circuit power supply
became lower than undervolt-
age detection level. Check the control supply volt-
age. _œ_œ_œ_›
Winding selection
fault Winding selection was not
completed within set time. Check the control constant C1-
25.
Check magnetic contactor wir-
ing for winding selection. _œ_œ_›_œ
Emergency stop
fault Inverter did not stop within 10
seconds after emergency stop
command. Check control constant C1-25.
Check the setting of control con-
stant C1-24 and whether exter-
nal torque limit signals TLL and
TLH are input. _œ_œ_›_œ
Encoder signal
cable disconnec-
tion Motor encoder signal was dis-
connected or connected
improperly. Check the wiring of encoder sig-
nal lines. _œ_œ_›_›
Motor overspeed Motor speed exceeded 120%
of set rated speed. Check that encoder signal lines
are separated from main circuit
or other power lines.
Check the control constants. _œ_œ_›_›