Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 420)

6-76 Component Definition and Maintenance
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
Replacing the Mesh Filters
When the conductivity of the coolant approaches the alarm level of
1.0 microSiemen, a conductivity alarm and/or fault occurs. To
correct the problem, first clean the fine mesh filters (see Figure 6.61)
and put the purification system back online. The filters should be
checked periodically and replaced when worn out. If the
conductivity does not decrease after cleaning the filters, the de-
ionization cartridge should be replaced. Note that if the filters are
clogged, coolant conductivity will increase even if the de-ionization
cartridge is still functioning properly. The filters and the de-
ionization cartridge can be changed while the drive is running.
1. Close valves V8 and V9, if provided, and unscrew the housing
(see Figure 6.62 ).
2. Drain some of the coolant by loosening the drain at the base of
the filter. Some spillage may occur so a pail should be placed
underneath.
3. The filter may be cleaned or replaced, however the de-ionizing
cartridge must be discarded and replaced with a new one.
Do not recycle the resin cartridge. It has been contaminated
with ethylene glycol.
4. Open valves V8 and V9, if provided, after cleaning. The high
conductivity warning will stop once the conductivity decreases
to its normal level.
Reservoir Circuit
The reservoir is a cross-linked, polyethylene fifteen-gallon container.
Level switch LS (see Figure 6.61) is a warning switch that
annunciates when the fluid drops down below the first level switch.
Level switch LSDL (see Figure 6.61) triggers the drive and cooling
pumps to shut down when the fluid drops below critical level.
Pump Maintenance and
Replacement (cont.)