Troubleshooting - YASKAWA CDBR-2015B Installation Manual

5 TROUBLESHOOTING

Only authorized personnel should be permitted to perform maintenance and
inspections or replace parts.
No. Fault Status
Braking resistor
unit overload relay
(or thermal over-
1
load protector) trips
when not decelerat-
ing.
Inverter trips at
2
overvoltage (ov).
Braking resistor
unit overload relay
3
(or thermal protec-
tor) sometimes
trips.
Braking unit trips
4
by heat sink over-
heat.
The fault contact of
a braking unit
instantaneously
5
turned ON when
the power was
turned ON.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
Cause
• Without braking unit
Inverter built-in main circuit dis-
charging transistor short circuited
• With braking unit
Braking unit main circuit discharg-
ing transistor short circuited
Improper braking unit power supply
voltage selection connector setting
(Power supply voltage > power sup-
ply voltage selection position)
Insufficient braking resistor unit
capacity
Improper wiring
Braking unit fault
Insufficient braking resistor unit
capacity
Excessive start/stop switching fre-
quency
Excessive load inertia
Improper combination of braking
unit and braking resistor unit
Ambient temperature 104°F (40°C)
Braking unit fault
Neither a braking resistor nor a
braking resistor unit is connected to
the braking unit.
46
Corrective Action
Replace the inverter.
Replace the unit.
Set it again.
Examine the braking
conditions again.
Check and repair.
Replace the unit.
Examine the braking
conditions again.
Examine the operat-
ing conditions again.
Reset.
Reduce it.
Replace the unit.
Connect a braking
resistor or braking
resistor unit to the
braking unit.