Afde Cooling Circuit - Trane Liquid-Cooled Adaptive Frequency AFDE Installation, Operation And Maintenance Manual

AFDE Cooling Circuit

The AFDE Adaptive Frequency Drive is cooled with liquid
refrigerant from the chiller. The refrigerant pump on the
chiller takes refrigerant from the condenser sump and
pushes it upwards to the motor to provide motor cooling.
The AFDE taps into this refrigerant flow and diverts a
portion of the refrigerant to the drive.
The refrigerant coolant enters the drive through the lower
flange fitting(s) on the back of the drive enclosure. The
refrigerant flows upwards through the drive and removes
heat from the assembly. The refrigerant exits the drive at
the top flange fitting(s) and flows to join the refrigerant
return from the motor, which then flows to the condenser.
Frame 3 (405A, 608A) utilizes a single chill plate.
Figure 13. Schematic of the cooling circuit
AFDE
Refrigerant
Pump
AFDE-SVU02F-EN
Chiller
Motor
A small orifice is installed in the lower flange inlet at the
drive. The purpose of the orifice is to regulate the amount
of refrigerant that enters the drive. Frame 4 (900A, 1210A)
utilizes dual chill plates. No orifices are used on the lower
flange inlets.
The differential pressure across the refrigerant pump is
normally 10 to 15 psid (68.9 to 103.4 kPad).
The temperature within the drive is monitored by the drive
controls and is displayed on the chiller's Tracer AdaptiView
display. The UC800 shuts the chiller down if the displayed
drive temperature exceeds 185°F (85°C).
The AFDE is not water-cooled, so water-cooling loop
maintenance is NOT needed for the drive.
Condenser
Refrigerant
Supply
Lines
Refrigerant
Return
Lines
35