Addressing High Coolant Conductivity - Rockwell Automation Allen-Bradley PowerFlex 7000 User Manual

Figure 127 - Reservoir Circuit

Addressing High Coolant Conductivity

When the conductivity of the coolant approaches the alarm level of 1.0 μS, a
conductivity alarm and/or fault occurs. To correct the problem, clean the fine
mesh filters (see Figure
Check the filters periodically and replaced when worn out. If the conductivity
does not decrease after cleaning the filters, replace the deionization cartridge.
If the filters are clogged, coolant conductivity will increase even if the
deionization cartridge is still functioning properly. The filters and the
deionization cartridge can be changed while the drive is running.
1. Close valves V8 and V9 (if provided) and unscrew the housing (see
Figure 127).
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.
ATTENTION: Do not recycle the resin cartridge. It has been contaminated
with ethylene glycol.
4. Add one 4 L jug of concentrated ethylene glycol with corrosion inhibitor
(Rockwell Automation PN 80026-739-01) to the reservoir. If the coolant
level is high in the reservoir, drain some coolant from the reservoir
before adding the ethylene glycol. Use the small transfer pump with
tubing that is mounted on the right side of the pump cabinet to add or
remove the coolant.
5. Open valves V8 and V9 (if provided) after cleaning. The high conductivity
warning will stop once the conductivity decreases to its normal level.
Rockwell Automation Publication 7000L-UM303F-EN-P - April 2022
Chapter 3 Power Component Definition and Maintenance
126) and put the purification system back online.
Vent Button
Filter
V8
V9
Deionizing Cartridge
139