BENSHAW M2L 3000, Руководство пользователя

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M2L 3000 Series VFD
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Table 22: Fault Conditions
Fault
Code
Fault Displayed
Reaction
Type
Description Course of Action
84
Precharge
timeout fault
The fault is triggered if the cell
capacitors do not charge to 90% of
nominal within 30 seconds of first
applying control power, or after resetting
of a fault.
Verify that all upstream switchgear for the
medium voltage supply to the drive is closed.
Reset the fault, then monitor capacitor
voltages on the Cell Status screen as the
drive attempts to precharge. If there is only
one cell with capacitors that are not charging
like the others, replace that cell.
If medium voltage is available to the drive,
and none of the cell capacitors charge, then
the Precharge Board is not closing its
precharge relays. The Precharge Board
receives the command to close its relays
from Digital Output 1 on the Remote IO block
by a 120VAC signal on wire 50.

Verify that Digital Output 1 is receiv-
ing 120VAC on wire 6B

Verify that Digital Output 1 closes
during precharge, and supplies
120VAC on wire 50

If the LED on Digital Output 1 indi-
cates that it is closed, but does not
supply 120VAC on wire 50, the digi-
tal output may have failed. Replace
the digital output module.
If Digital Output 1 is functioning normally, the
Precharge Board may have failed, or there
may be a loose connection to the Precharge
Board. Be sure to remove Medium Voltage
and allow time for the cell capacitors to
discharge before accessing the Precharge
Board.

Verify that wires 50 and 7 are se-
curely connected to the Precharge
Board

Verify that the thick white wires are
securely connected to the main con-
tactor tabs and studs on the Pre-
charge Board.

If all wires are securely connected,
the Precharge Board may have
failed. Replace the Precharge Board.
If medium voltage is available to the drive,
the drive has multiple Precharge Boards in
parallel, and all of the cells charge to a value
that is only a fraction of the expected voltage
before the Precharge timeout fault occurs,
one of the multiple precharge circuits may
have a loose connection, or failed
component. Follow the same troubleshooting
steps outlined above.