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Steps
Figure 26: DC Terminal Block Cover Installed on Rear of Power Tray
Step 2
Verify the following resistance values:
• The resistance between the positive and negative power terminal studs of each input must be greater than 90 Kohm.
• The resistance between each positive terminal stud and bare metal surface on the power tray must be greater that 10
Mohm.
• The resistance between each negative terminal stud and bare metal surface on the power tray must be greater that
10 Mohm.
Typical hand held ohm meters will not measure 10 Mohm; instead they will auto-range to acquire a measurement
Note
and give an out-of-range reading. This is an acceptable reading provided that the meter is in calibration.
Step 3
Use the crimping tool mandated by the lug manufacturer to crimp the lugs to the DC input cables. For details on lugs,
see the
DC Power System, on page
The cable should be sized according to local and national installation requirements. Use only copper cable.
The power supply terminal block lug width is 0.60 inches (1.50 cm). The terminal posts are centered 0.63 inches
Note
(16 mm) apart and are 1/4-20 thread. We recommend that you use an appropriately sized 90-degree,
industry-standard, dual-hole, standard barrel compression lug.
Step 4
Using the wrench, attach the positive and negative cable pairs to each terminal block on the power tray (PT0). Start with
PM0 (located on the right side) and move left, finishing with PM3 (located on the left side). Use the torque wrench to
tighten to a torque of 45 to 55 in-lb (5.1 to 6.2 N-m).
Step 5
Align the DC terminal block cover with the cover latch tab.
Step 6
Slide the terminal block cover upwards to align the screw with the mounting standoff.
Step 7
Use the screwdriver to secure the screw into the mounting standoff and tighten to a torque of 5 to 7 in-lb (0.56 to 0.79
N-m).
Installing Power Components
26
6.
Installing Power Components
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