HP rp7440 User Service Guide, Fourth Edition - HP Integrity rx7640 and HP 9000 - Page 69

Verifying the Safety Ground (Dual Power Source), Safety Ground Reference Check, WARNING

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Figure 3-22 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. 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. 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. 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. 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 3-23 for ground reference points when performing these measurements. Cabling and Power Up 69

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Figure 3-22
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.
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.
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.
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.
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 3-23
for ground reference points when performing these measurements.
Cabling and Power Up
69