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.
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3
Powering On and Off a DRH
After a DRH is powered on, check the status of DRH indicators and voltage. Before the DRH
is powered off, follow the normal power-off or emergent power-off procedure as required.
3.1 Powering On a DRH
Switch on the circuit breakers on the auxiliary power device for a DRH and observe the
indicators on the DRH to check the running status.
Prerequisites
The DRH hardware is installed and DRH cable connections are secure.
The input voltage of a DC DRH ranges from -36 V DC to -57 V DC.
The input voltage of an AC DRH ranges from 90V AC to 290 V AC.
Context
After you unpack a DRH, you must power on it within 24 hours. If you power off the DRH
for maintenance, you must restore power to the DRH within 24 hours.
Procedure
Step 1
To power on the DRH, set the corresponding circuit breaker on the auxiliary power device for
the DRH to ON.
Do not look into the optical module without eye protection after the DRH is powered on.
Step 2
Wait for three to five minutes, and then check the status of the indicators on the DRH. For
details, see section "DRH Indicators" in the
DRH Hardware Description
.
