Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control - Manual (Page 78)

78 Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014
Chapter 2 Drive Installation
Before welding or assembly:
• Remove debris, particulate, oils and greases from inside pipes and valves
before welding.
• Use a high-pressure water spray to remove debris and particulate from
pipes and valve.
• Remove oils and greases with solvents.
Finished pipe system
1. Circulate hot water with industrial detergent through external piping
system only for at least 4...8 hours. Maintain a water temperature of
60…71 °C (140…160 °F). Do not circulate through the drive piping.
2. Circulate clean hot water until the effluent is clear.
Do not allow oils, greases, solvents, cleaning detergents or other cleaning
agents to contact or enter the drive piping as this may cause stress cracking
of CPVC piping.
Refer to ASTM A 380-06 "Standard Practice for Cleaning, Descaling, and
Passivation of Stainless Steel Parts, Equipment, and Systems" for additional
information.
Controlled Siphon into Open-
top Reservoir Rockwell Automation recommends this method of pipe routing for pipes and
heat exchangers higher than the reservoir coolant level. The reservoir is located in
the VFD pump cabinet. This method controls the siphoning of coolant into the
open top reservoir when the coolant pumps are off for maintenance. It prevents
the siphoning of all pipes higher than the reservoir liquid level causing reservoir
overflow. Siphoning occurs only when both pumps are off.
1. Ensure vertical pipe from drive to vent valve is the same size (1-1/2" or
2.0") as the main VFD pipe. The rear outlet flanges may be 1-1/2" or 2.0"
size. Keep the vertical pipe this exact size to maintain minimum coolant
siphon flow into reservoir. Add 1-1/2" Ball Check Valve (Rockwell Part
80025-750-01, Flow Coefficient Cv 80 or equivalent) into vertical exit
piping. Increase pipe size to 2.0" or 3.0" respectively for the remainder of
the pipe circuit.
2. Vents to the top of the reservoir may be 1.0" CPVC pipe or PVC hose. The
end shall not be immersed into the reservoir coolant. Cut a hole into the
top of the reservoir to allow leakage flow.
Vent valve ARV100VS-CP may be obtained from www.plastomatic.com .