4-10 Cooling Loop Installation
PowerFlex® 700L Liquid-Cooled Drive User Manual
Publication 20L-UM001D-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
Liquid-Cooled Frame 2 drives, refer to 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 psig).
Coolant supply and return lines should be sized 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.G
.
The rated working pressure of the Frame 3A or 3B Power Module is 12.76
bar (185 PSI). Coolant supply and return lines should be sized 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.G
.
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
. The mating process includes
the following 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)
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