5-4
LiquiFlo AC Power Modules, Hardware Reference Version 6.4
5.3 Installing a Required External/Separate Input
Disconnect
An input disconnect must be installed in the line before the drive input terminals in
accordance with local, national, and international codes (e.g., NEC/CEC). The
disconnect should be sized according to the in-rush current as well as any additional
loads the disconnect might supply. The trip rating for the inrush current (10-12 times
full load current) should be coordinated with that of the input isolation transformer, if
used. Refer to section 5.1 for additional information.
5.4 Installing Power Wiring from the AC Input Line to the
Drive’s Power Terminals
Use the following steps to connect AC input power to the drive:
Step 1. Wire the AC input power leads by routing them as shown in figure 4.1. Tables
3.3. 3.4, and 3.5 contains the recommended power wiring sizes.
Step 2. Connect the three-phase AC input power leads (three-wire 380-480 VAC) to
the appropriate terminals.
On 6-pulse rectifier drives, connect the AC input power leads to the L1, L2,
and L3 terminals. See figure 5.1.
On 12-pulse rectifier drives, connect the AC input power leads to the L1, L2,
L3, L4, L5, and L6 terminals. See figure 5.2.
Step 3. Tighten the AC input power terminals to the proper torque as shown in table
5.1.
!
ATTENTION: Do not route signal and control wiring with power wiring in
the same conduit. This can cause interference with drive operation.
Failure to observe this precaution could result in damage to, or
destruction of, the equipment.
Table 5.1 – Terminal Tightening Torques
Drive Type Terminals Hardware Type
Maximum Tightening Torque
(+10%)
B-Frame
L1 to L6 1/4-20, Gr. 5 13 Newton-meters (10 ft-lb)
U, V, W 5/16-18, Gr. 5 24 Newton-meters (18 ft-lb)
GND, PE 5/16 Hex 31 Newton-meters (23 ft-lb)
C-Frame
L1 to L6 1/2-13; Gr. 5 100 Newton-meters (75 ft-lb)
U, V, W 3/8-16, Gr. 5 42 Newton-meters (31 ft-lb)
GND, PE 5/16 Hex 31 Newton-meters (23 ft-lb)
D-Frame L1 to L6 1/2-13; Gr. 5 100 Newton-meters (75 ft-lb)
U, V, W 1/2-13; Gr. 5 100 Newton-meters (75 ft-lb)
GND, PE 1/2 Hex 58 Newton-meters (42 ft-lb)
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