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C-2 A
PPENDIX
C: MSH P
OWER
C
ONSUMPTION
L
IMITS
DUA1800-0AAA04
Power consumption calculations must include the power used by
the chassis and its components.
■
The basic chassis (3C18000), fitted with display panel, thermal
management unit and backplane, consumes 67 watts (5.7 A @
+5V and 3.2A @ +12V).
■
A chassis fitted with an FDDI backplane (3C18001 or converted
3C18000) consumes an additional 19 watt (an additional 3.8A @
+5V).
These figures must be included in the calculation of the total
power consumption. If you are using ECS modules with
converters, remember to include the power and current
consumed by the converter. The maximum allowable power
consumption will vary with the choice of PSUs you have made.
The individual limits listed in the table below must not be
exceeded.
†You will have resilience provided these limits are not exceeded.
‡These figures are the maximum current and power you may take from the combined
power supply.
Table C-1 Power consumption limits
PSU
configuration
Resilient
5V supply
(A
1 amps
)
12V supply
(A
2 amps
)
Total power
(watts)
single 375W PSU No 45 15 375
single 525W PSU No 90 15 525
two 375W PSUs
Yes† 45 15 375
No 90 30 750‡
two 525WPSUs
Yes† 90 15 525
No 90 30 750‡
one 375W PSU &
one 525W PSU
Yes† 45 15 375
No 90 30 750‡
Chassis.bk : APPENDC Page 2 Monday, February 10, 1997 1:11 PM