87
Power Supplies (MPWS139)
The InterServe 650 and 660 servers and StudioZ RAX workstations use redundant 550 watt current-
sharing power supplies. Each power supply has six outputs, is hot swappable, and is auto-ranging
between 90 - 132 VAC and 180 - 264 VAC. The input frequency range for each power supply is
47 - 63 Hz, single phase. The power supply has the following DC output specifications:
Output 1
4, 5
Output 2
4, 5
Output 3
6
Output 4
5
Output 5 Output 6 Unit
Nominal Output
Voltages
1, 3
+3.3 +5.1 +5.0 +12.0 -12.0 -5.0 VDC
Continuous Load
(Maximum.)
1
45 85 1 12 1 1 ADC
Continuous Load
(Minimum.)
1
0.0 3.5 0.0 1.0 0.0 0.0 ADC
Noise and Ripple
(PARD) (DC to
30 MHz)
50 50 50 100 250 100 mVp-p
Max
Initial Setting
Tolerance
3
3% 3% 3% 5% 10% 10% Max
Regulation
Line/Load
2, 3
3% 3% 3% 5% 10% 10% Max
Overshoot
(Turn on/off)
5% 5% 5% 10% 10% 10& Max
DC Output Specification Notes:
1. The power supply meets or exceeds these specifications.
2. These outputs are measured differentially at the Elcon connector terminated with 0.1
µ
f ceramic
capacitor.
3. The sum of the Initial Setting Tolerance and Line/Load Regulation does not exceed 3% for the
+3.3 V, +5.1 V, and +5.0 V (always on) outputs, 5% for the +12.0 V output, and 10% for the
negative output voltages.
4. Any combination of +3.3 V or +5.1 V do not exceed their maximum power or 450 watts of total
power.
5. Any combination of +3.3 V, +5.1 V, or +12 V do not exceed their maximum power or 550 watts of
total power.
6. This output is always on.
Operating characteristics of the power supplies include the following:
u
Over-Current Protection is provided on +3.3 VDC and +5.1 VDC outputs. The Over-Current
Protection disables the DC outputs (except the +5.0 V) and keeps them disabled until AC is
cycled.
u
Over-Voltage Protection is provided on +3.3 VDC and +5.1 VDC. The Over-Voltage Protection
disables the DC outputs (except the +5.0 V) when the output reaches 5.5 - 6.8 VDC for +5.1 V DC
or 3.7 - 4.4 VDC for +3.3 VDC. The DC outputs remain disabled until AC is cycled.
u
Once the +5.1 V output is turned on by the power supply, it reaches its nominal output (see the
table above) within 750 ms at all line and load conditions.
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