Yaskawa VARISPEED-600 SERIES INVERTER - Manual (Page 45)

46
5. TROUBLESHOOTING
Only authorized personnel should be permitted to perform maintenance and inspec-
tions or replace parts.
No. Fault Status Cause Corrective Action
Braking resistor
: Without braking unit
Inverter built−in main circuit dis-
charging transistor short circuited
Replace the inverter.
1
Braking resistor
unit overload
relay (or thermal
overload protec-
t ) t i h t
: With braking unit
Braking unit main circuit discharging
transistor short circuited
Replace the unit.
p
tor) trips when not
decelerating.
Improper braking unit power supply
voltage selection connector setting
(Power supply voltage > power sup-
ply voltage selection position)
Set it again.
2
Inverter trips at
Insufficient braking resistor unit ca-
pacity
Examine the braking
conditions again.
2
Inverter trips at
overvoltage (OV). Improper wiring Check and repair. overvoltage (OV).
Braking unit fault Replace the unit.
3
Braking resistor
unit overload
relay (or thermal
protector) some-
times trips.
Insufficient braking resistor unit ca-
pacity
Examine the braking
conditions again.
Braking unit trips
Excessive start/stop switching fre-
quency
Examine the operat-
ing conditions again
4
Braking unit trips
by heat sink over-
Excessive load inertia
ing conditions again.
4 by heat sink over-
heat.
Improper combination of braking
unit and braking resistor unit
Reset.
Ambient temperature 104EF (40EC) Reduce it.