The Branch Control Function - HP E1135C Operating And Service Manual

OPERATING DESCRIPTIONS

The Branch Control Function

If you are installing a single PDU, not controlling or controlled by
another PDU, ignore this section. Set S2 on the Control Board to the
MAIN position.
An HP E1135C PDU can be used to control one or more other HP E1135 PDUs in a
hierarchy as shown on page 19. The PDUs are defined as:
Main PDU: There can be only one main PDU in a hierarchy. It controls one or more
downstream branch or sub-branch PDUs, but cannot be controlled by another PDU. Set S2
on the Control Board to MAIN.
Branch PDU: There can be one or more branch PDUs. They are controlled by upstream
PDUs and control downstream PDUs. Set S2 on the Control Board to BRANCH.
Sub-branch PDU: There can be one or more sub-branch PDUs. They are always at the
bottom of the control path. They are controlled by an upstream main or branch PDU but
cannot control another PDU. Set S2 on the Control Board to BRANCH.
If the main PDU goes off, all other PDUs go off. If a branch PDU goes off, only the branch
and sub-branch PDUs below it go off; no PDUs above it are affected.
Every main, branch, and sub-branch PDU can also have its own Outputs Enable and EMO
Switches. These switches are optional; you can use them if you want local control at each PDU.
To implement branch PDUs, see "Setting Up Branch PDUs" on page 19.
HP E1135C POWER DISTRIBUTION UNIT Rev. C
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