HP Integrity rx7640, Installation Manual

Page: 76 / 101

Chapter 2
Installing the Server
Cabling and Power Up
76
Verifying the Safety Ground (Dual Power Source)
Use this procedure to measure the voltage level between A0 and A1, between B0 and B1, between A0 and B0,
and between A1 and B1. Take all measurements between ground pins. Refer to Figure 2-23 for ground
reference points when performing these measurements.
Figure 2-23 Safety Ground Reference Check
WARNING
SHOCK HAZARD
Risk of shock hazard while testing primary power.
Use properly insulated probes.
Be sure to replace access cover when finished testing primary power.
Step 1. Measure the voltage between A0 and A1 as follows:
1. Take the AC voltage down to the lowest scale on the volt meter.
2. Insert the probe into the ground pin for A0.
3. Insert the other probe into the ground pin for A1.
4. Verify that the measurement is between 0-5 V AC.
If the measurement is 5 V or greater, escalate the situation. Do not attempt to plug the power cord
into the server cabinet.
Step 2. Measure the voltage between B0 and B1 as follows:
1. Take the AC voltage down to the lowest scale on the volt meter.
2. Insert the probe into the ground pin for B0.
3. Insert the other probe into the ground pin for B1.