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Installation guide

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Chapter 4
Cabling and Power Up
Voltage Check
45
Safety Ground Verification (Dual Power Source)
This procedure measures the voltage level between A0 and A1, between B0 and B1, between A0
and B0, and between A1 and B1. All measurements will be taken between ground pins. See
Figure 4-3 for ground reference points when performing these measurements.
Figure 4-3 Safety Ground Reference Check—Dual Power Source
Step 1. Measure the voltage between A0 and A1. Take the AC voltage down to the lowest scale on the volt
meter. One probe is inserted into the ground pin for A0. The other probe is inserted into the ground
pin for A1. Verify that the measurement is between 0–5 VAC. If the measurement is 5 V or greater,
escalate the situation. Do not attempt to plug the power cords into the server cabinet.
Step 2. Measure the voltage between B0 and B1. Take the AC voltage down to the lowest scale on the volt
meter. One probe is inserted into the ground pin for B0. The other probe is inserted into the ground
pin for B1. Verify that the measurement is between 0–5 VAC. If the measurement is 5 V or greater,
escalate the situation. Do not attempt to plug the power cords into the server cabinet.
Step 3. Measure the voltage between A0 and B0. Take the AC voltage down to the lowest scale on the volt
meter. One probe is inserted into the ground pin for A0. The other probe is inserted into the ground
pin for B0. Verify that the measurement is between 0–5 VAC. If the measurement is 5 V or greater,
escalate the situation. Do not attempt to plug the power cords into the server cabinet.
Step 4. Measure the voltage between A1 and B1. Take the AC voltage down to the lowest scale on the volt
meter. One probe is inserted into the ground pin for A1. The other probe is inserted into the ground
pin for B1. Verify that the measurement is between 0–5 VAC. If the measurement is 5 V or greater,
escalate the situation. Do not attempt to plug the power cords into the server cabinet.
Step 2
V
GND
L1 L2 L1 L2
GND
B0
B1
A0
GND
L1 L2
V
Step 1
L2
A1
L1
GND
Step 4
V
Step 3
V