Hitachi HBU-2015, Инструкция по эксплуатации

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Hitachi America, Ltd.
Tarrytown, NY
20
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 Symptom Possible Cause Solution
Wiring error Check the wiring
1
The “POWER” light of the braking
unit is not illuminated when the
inverter is energized
HBU set for “SLAVE”
Confirm that the jumper is
set for “MASTER”
Short circuit on Braking unit
IGBT
Change the braking unit
Wrong connection of the
braking resistor.
Examine the braking
resistance and its connection.
2
The “BRAKING” light is on all the
time.
AC Input to the inverter is
high
Check that AC supply is
within spec
Wiring error Recheck connections
3 “Over voltage” trip on inverter.
The capacity of braking unit
and braking resistor is not
enough.
Examine the design and
recalculate it.
Braking usage rate (%ED) is
too high
Examine the design and
recalculate it.
4
The braking unit trips because the
temperature of resistor is too high. The ambient temperature is
over 40 ˚ C
Reduce the ambient
temperature where the HBU
is installed.