Owner's manual

Cooling Loop Installation 4-7
PowerFlex 700L Frames 2, 3A, and 3B Liquid-Cooled AC Drives User Manual
Publication 20L-UM001E-EN-P
Drive Coolant Connections
Frame 2 Drive or Frame 3A or 3B Power Module
For locations of the coolant inlet and outlet connections on PowerFlex 700L
Frame 2 drives, see Figure 2.10
. For locations on Frame 3A and 3B Power
Modules, see Figure 3.20
.
The rated working pressure of the Frame 2 drive is 6.89 bar (100 psi). Size
coolant supply and return lines for 76 LPM (20 gpm) / 6.89 bar (100 psi)
service with a maximum operating temperature of 50 °C (122 °F). The
required operating flow rate and pressure drop is specified in Table 4.C
.
The rated working pressure of the Frame 3A or 3B Power Module is 12.76
bar (185 psi). Size coolant supply and return lines for 38 LPM (10 gpm) /
12.76 bar (185 psi) service with a maximum operating temperature of 40 °C
(105 °F). The required operating flow rate and pressure drop is specified in
Table 4.C
.
Coolant connections for Frame 2 drives and Frame 3A and 3B Power
Modules are made using 37 degree flare fittings which have a:
• 3/4-inch nominal size
• “-12” SAE dash size
• 1-1/16-12 UN/UNF-2B external thread size
The mating connection is shown in Figure 4.7
. To make the mating coolant
connection, follow these steps.
1. Assemble the mating version of the fitting (with swivel nut) to each
fluid fitting, and tighten to a wrench resistance of approximately 3.4
N•m (30 lb•in).
2. Using a backup wrench on the Power Module fitting, tighten the swivel
nut fitting by either of the following two methods:
– Hex flats from wrench resistance method (recommended): one and
one-quarter (1-¼) hex flat from wrench resistance.
– Torque method: 69…77 N•m (51…57 lb•ft).
Figure 4.7 Power Module Mating Coolant Connection
37° Flare Fitting
Wrench Flats
Swivel Nut
Backup Wrench
(use to prevent twisting
during swivel nut tightening)