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Troubleshooting - Hitachi HBU-2015 Instruction Manual

Dynamic braking unit
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IV. Troubleshooting
The internal protection circuit of the braking unit will cause it to shut down in the case of any internal malfunction.
Should this occur, it would likely result in an over voltage trip on the inverter.
In case of difficulty, use the table below to try to find possible solutions. Should this not resolve the problem, please
contact your Hitachi distributor for further assistance.
Item
The "POWER" light of the braking
1
unit is not illuminated when the
inverter is energized
The "BRAKING" light is on all the
2
3
"Over voltage" trip on inverter.
The braking unit trips because the
4
temperature of resistor is too high.
20
Symptom
Short circuit on Braking unit
time.
The capacity of braking unit
Braking usage rate (%ED) is
The ambient temperature is
Possible Cause
Wiring error
HBU set for "SLAVE"
IGBT
Wrong connection of the
braking resistor.
AC Input to the inverter is
high
Wiring error
and braking resistor is not
enough.
too high
over 40˚C
Hitachi America, Ltd.
Tarrytown, NY
Solution
Check the wiring
Confirm that the jumper is
set for "MASTER"
Change the braking unit
Examine the braking
resistance and its connection.
Check that AC supply is
within spec
Recheck connections
Examine the design and
recalculate it.
Examine the design and
recalculate it.
Reduce the ambient
temperature where the HBU
is installed.

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