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Top Level Module Removal In...
7.1.5 F-Frame Service Shelf
The rectifier and inverter modules weigh up to 136 kg/300
lbs each and require special handling. An easy to assemble
service shelf, part number 176F8835, is available from
Danfoss to provide support of the modules for removal
from the units. This shelf, or other suitable support
equipment, is recommended.
Illustration 7.1 F-Frame Service Shelf Assembly Drawing
High Power Service Manual for Modular F Frame Drives
7.2 Instructions
NOTE for 12-pulse frequency converters. Instructions
presented here are the same for 12-pulse units as F-frame
units with the exception that 12-pulse units may vary in
the number of SCR and diode modules as described for F-
frame units. Also, for F8/F9 model 12-pulse units, an
additional MPIC card is connected to the power card to
provide control to the additional SCRs present on those
units.
7.2.1 AC Line Input Fuses
AC Fuse Location
AC line fuses are optional. AC fuses are located in the
rectifier cabinet if they are the only power option added to
the frequency converter. If additional power options are
present, the AC fuses will be located in the options
cabinet.
AC Fuses Located in the Rectifier Cabinet
AC Fuses Located in Options Cabinet
®
MG90K202 - VLT
is a registered Danfoss trademark
1.
Remove bottom safety cover from rectifier
cabinet.
Note: Fuses must be removed sequentially, front
to back. If only the fuse located in the back
needs to be replaced, remove front and middle
fuses to gain access to the back fuse. If additional
access is necessary, the left-most inverter module
can be removed from the inverter cabinet. Refer
to inverter removal instructions.
2.
Remove bolts (8mm) securing fuses in place.
1.
Remove covers from options cabinet to access
fuses.
2.
Remove bolts (8mm) securing fuses in place.
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