IBM 7014 T00, Manual

Page: 48 / 196

15. If the B PWR LED is green (normal operation), test the B PWR relay and contact the alarm terminal.
• Ensure that there is continuity (0Ω) between Terminals C and NC.
• Ensure that there is an open circuit (∞Ω) between Terminals C and NO.
Attention: Turn off all -48V DC power sources that are connected to the PDP.
16. After the -48V DC power sources are turned off, ensure that there is a tag or label over each of the
power source switches or fuses (lock-out/tag-out) to indicate that the power source has been turned
off intentionally.
17. If there are system components you must connect to the PDP, go to “Connecting the system
component power to the PDP” on page 34. If there aren't any system components that need
connecting, continue with the next step.
18. Replace the A and B side plastic bus bar covers that you removed in step 3. To replace the covers,
perform the following tasks:
a. Position the A side cover over the A side connections.
b. Install the two retaining screws for the A side cover.
c. Position the B side cover over the B side connections.
d. Install the two retaining screws for the B side cover.
DANGER:
The bus bar covers must be correctly reinstalled to protect against possible injury when
maintenance is performed on the power distribution panel.
19. Replace the PDP top that you removed. To replace the PDP top cover, perform the following tasks:
a. Position the PDP top cover onto the PDP.
b. Install the four retaining screws.
20. Install the cable channel cover that you removed. To install the cable channel cover, perform the
following tasks:
a. Position the cover over the retaining screws and align the larger openings in the cover with the
retaining screw heads.
b. Set the cover down over the retaining screws and slide it towards the rear of the rack so the
screws are now located in the narrow slots.
c. Tighten the four retaining screws.
Attention: Ensure that all the circuit breakers are in the off position.
21. Restore power to both the A and B sides of the PDP.
22. Continue with “Powering on the DC-powered system components” on page 43.
Connecting the system component power to the PDP
This section provides information about installing the component -48V DC power cable assemblies into
the PDP. Power cables are supplied with the IBM device that you want to install.
About this task
Note: If the device to be installed is not provided by IBM, you must provide your own DC power cables.
Note: Ensure that you remove any oxidation on the copper bus bars and/or copper terminals.
Note: If required, lightly coat anti-oxidant on the output power cable lugs and on the -48V output
terminals and return bus bar terminals.
Note: Some system components may have the power supply identified alphabetically instead of
numerically.
34 Power Systems: Racks and rack features