INVT DBU100H Series User Manual

Operational manual for dynamic braking unit
-15-
7 Fault analysis and the solution
The fault can be indicated through LEDs. When the FAULT LED is on, it means the dynamic
braking unit is abnormal. Check the faults one by one according to the information in the below
table. Find the possible reasons and the solutions. If not, please contact with the local INVT
office.
Serial
No.
Fault state
Reasons
Solutions
1
Serious
heat-releasing of
the braking resistor
during the braking
The power of the braking resistor
is too low.
Change a braking
resistor with bigger
power.
2
Serious
heat-releasing of
the braking resistor
when not braking
IGBT damage
Change the
braking unit
The voltage selection of the
braking unit is not correct.
Reset
Braking unit fault
Change the
braking unit
3
OU of the DBU
Insufficient braking capacity of the
braking resistor
Recheck the
braking condition
Wrong wiring
Check and correct
The voltage selection of the
braking unit is not correct.
Reset
Braking unit fault
Change the
braking unit
4
Output signal of
the fault relay
Valid external fault input
Recheck the
running condition
Short circuit of the braking resistor
Change the
braking resistor
The temperature of IGBT is over
85℃
Note: when the external grid voltage is too high, please set bigger voltage.
 Non-isolated circuit is applied in the control circuit of the braking unit.
Disconnect the wiring between (+) and (-) and ensure there is no voltage
during the operation and checking.

INVT DBU100H Series Specifications

General

Brand	INVT
Model	DBU100H Series
Category	Industrial Electrical
Language	English