DRH
Hardware Maintenance Guide
3 Powering On and Off a DRH
Issue 1.0(2013-04-10)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5
If DRHs are cascaded, check the status of all DRH indicators.
Step 3
Take corresponding actions based on the status of the indicators.
If...
Then...
The DRH is operating properly
End the power-on check task.
The DRH is faulty
Set the circuit breaker to OFF, rectify the
fault, and go to
----End
3.2 Powering Off a DRH
The procedure for powering off a DRH varies with the actual condition, for example, in a
normal situation or an emergency. You must power off the DRH in a normal situation such as
moving the equipment or anticipating a territorial blackout. You must also power off the DRH
in an emergency such as a fire, smoke, or water damage.
Procedure
To perform a normal power-off, perform the following steps:
If DRHs are cascaded, consider the impacts of power-off operations on lower-level DRHs to prevent
service interruption.
Step 1
Set the corresponding circuit breaker on the auxiliary power device for the DRH to
OFF.
To perform an emergent power-off, perform the following steps:
Emergent power-off may lead to damage on the DRH. Therefore, this type of power-off is not
recommended in normal cases.
Step 1
Disconnect the power supply from the auxiliary power device for the DRH.
Step 2
If time permits, set the corresponding circuit breaker on the auxiliary power device
for the DRH to OFF.
----End
