HP Server rp7420 HP 9000 rp7420 Server - User Service Guide, Fifth Edition - Page 53

Verifying the Safety Ground, Voltage Reference Points for IEC 320 C19 Plug, IMPORTANT

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Figure 4-3 Voltage Reference Points for IEC 320 C19 Plug IMPORTANT: Perform the following measurements for every power cord that plugs into the HP 9000 rp7420 server. 1. Measure the voltage between L1 and L2. This is considered to be a phase-to-phase measurement in North America. In Europe and certain parts of Asia-Pacific, this measurement is referred to as a phase-to-neutral measurement. The expected voltage measured should be between 200-240 VAC regardless of the geographic region. 2. Measure the voltage between L1 and ground. In North America, verify this voltage is between 100-120 VAC. In Europe and certain parts of Asia-Pacific, verify this voltage is between 200-240 VAC. 3. Measure the voltage between L2 and ground. In North America, verify this voltage is between 100-120 VAC. In Europe and certain parts of Asia-Pacific, verify this voltage is 0 (zero) VAC. Table 4-1 provides single phase voltage measurement examples dependent on the geographic region where these measurements are taken. Table 4-1 Single-Phase Voltage Examples Japan North America Europe1 L1-L2 210 V 208 V or 240 V 230 V L1-GND 105 V 120 V 230 V L2-GND 105 V 120 V 0V 1 In some European countries there might not be a polarization. Verifying the Safety Ground This measures the voltage level between B0 and A0. The measurement is taken between ground pins of the two power cords. For ground reference points when performing this measurement, see Figure 4-4. Checking the Voltage 53

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Figure 4-3 Voltage Reference Points for IEC 320 C19 Plug
IMPORTANT:
Perform the following measurements for every power cord that plugs into the
HP 9000 rp7420 server.
1.
Measure the voltage between L1 and L2. This is considered to be a phase-to-phase
measurement in North America. In Europe and certain parts of Asia-Pacific, this measurement
is referred to as a phase-to-neutral measurement. The expected voltage measured should
be between 200–240 VAC regardless of the geographic region.
2.
Measure the voltage between L1 and ground. In North America, verify this voltage is between
100–120 VAC. In Europe and certain parts of Asia-Pacific, verify this voltage is between
200–240 VAC.
3.
Measure the voltage between L2 and ground. In North America, verify this voltage is between
100–120 VAC. In Europe and certain parts of Asia-Pacific, verify this voltage is 0 (zero) VAC.
Table 4-1
provides single phase voltage measurement examples dependent on the geographic
region where these measurements are taken.
Table 4-1 Single-Phase Voltage Examples
Europe
1
North America
Japan
230 V
208 V or 240 V
210 V
L1-L2
230 V
120 V
105 V
L1-GND
0V
120 V
105 V
L2-GND
1
In some European countries there might not be a polarization.
Verifying the Safety Ground
This measures the voltage level between B0 and A0. The measurement is taken between ground
pins of the two power cords. For ground reference points when performing this measurement,
see
Figure 4-4
.
Checking the Voltage
53