Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 414)

6-70 Component Definition and Maintenance
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
Thermostatic Valve
The thermostatic valve (TV1) shown in Figure 6.56 is similar to an
automobile thermostat. When the fluid is cool, the valve bypasses the
flow away from the heat exchanger to re-circulate within the drive.
As the fluid increases in temperature, the valve gradually opens,
letting a trickle of fluid flow through the heat exchanger. The
thermostatic element is set to begin opening at 29ºC (85ºF) and is
fully open at 38ºC (100ºF). All flow then travels to the heat
exchanger. The thermostatic valve keeps the semiconductor devices
from getting too cold, and it keeps the chill block near room
temperature to prevent condensation.
TV1
Figure 6.56 – Thermostatic Valve
Pump Maintenance and
Replacement (cont.)