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Quad Amp Hardware Reference Manual
Troubleshooting
32
Motor moves after a
command is issued but
under voltage fault
comes on shortly after.
Also, the Soft Start
resistor heats up (and
possibly burns).
Verify if the bus voltage sags when
the motor is commanded to move.
The Main IGBT probably does not
turn on. Check if the wiring between
E1 and G1 (of Main IGBT) and J4-5, -
6 (Soft Start board) is okay. Then
verify if G1 with respect to E1
switches from approx. –10 VDC to
+15 VDC after the Main power is
turned on. If it does, the Main IGBT
is probably open. If it does not, the
problem is most likely with the Soft
Start board.
Call Delta Tau for an RMA.
Under voltage fault
stays displayed even
after several enable
commands.
Check if there is bus voltage across
15k Ohm bleed resistor.
If not, examine if the 10-pin flat cable between
the Soft Start and the I/O Logic board is
connected on both sides and in good shape.