Emerson AXP640-AC2-110VAC, Installation & Use Manual

Page: 97 / 190

AXP640 Shelf Installation
AXP640 Installation and Use (6806800M24E)
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Procedure
Have the following tools on hand before you begin these steps: standard Phillips screwdriver,
nut driver, torque wrench, multimeter, and lugs.
1. Locate the target power input cable’s terminals at the branch circuit or power
distribution unit. Open the external circuit breakers that provide DC feed power to
the chassis.
2. Lock and tagout the circuit breakers on the branch circuit or power distribution
unit.
3. Using the appropriate tool, carefully remove the plastic covering over the terminal
blocks.
4. Confirm that there is no power to the chassis lug bolts. Using a multimeter,
measure between the two lugs and then measure between the chassis ground and
each lug. If the DC potential is 3.0VDC or less, then power is not present.
5. Attach the DC power cables (input and return) to the dual lug bolts on each chassis
power feed.
6. Using a torque wrench, tighten the nuts with a recommended torque setting of
35.5 to 38.5 inch-pounds. Make sure all DC leads are fastened securely.
7. Replace the plastic cover over the terminal blocks.
Cables may or may not be preinstalled at the branch circuit or power distribution unit.
If the DC power cables are not connected to the branch circuit or power distribution unit,
connect the power cables to the chassis before connecting the DC power cables to the
external power source.
If the DC power cables are connected to the branch circuit or power distribution unit, a
qualified service person must confirm that the power to the cables is terminated (off) before
continuing the steps to attach the cables to the PEMs.
In either case, use a multimeter to check the PEM end of the terminals to confirm there is no
power present.