IBM DR550, Problem Determination And Service Manual

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Chapter 3. DR550 rack power control assembly
Model DR1 power control assembly power problems
Use the following information and Figure 1 when debugging a power problem
with the model DR1 power control assembly.
The power control assembly (PCA) is located at the rear of the rack at EIA position
1 and receives power through the rack power cord which is plugged into the
client’s power source.
With the PCA plugged into the client's power source (and source is on), the right 5
PCA power outlets (J1 through J5) turn on and then 2.5 seconds later the left 5
PCA power outlets (J6 through J10) turn on.
Checking CB1
CB1 is the main circuit breaker for the PCA. When CB1 is on (pushed in), AC
power is being distributed. When CB1 is off (pulled out), AC power is not being
distributed.
Make sure that CB1 is pushed in. If the AC present LCD is off, check the client’s
wall CB to make sure it is on and that the power cord is properly plugged at the
PCA and the client’s power source. Then proceed to “Checking CB2 and CB3.”
Checking CB2 and CB3
CB2 and CB3 control the 10 power outlets on the PCA. CB2 controls power outlets
J1 through J5 and CB3 controls power outlets J6 through J10.
When CB2 is on (pushed in) AC power is being distributed to J1 through J5. When
CB2 is off (pulled out), AC power is not being distributed to J1 through J5.
Figure 1. DR550 Model DR1 power control assembly
© Copyright IBM Corp. 2008
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