C
HEETAH
864XR
V
IDEO
M
ATRIX
S
WITCHER
Publication 81-9059-0595-0, Rev. C
October 2010
Proprietary Information of
PESA
3-8
Output VDC
(-)
(+)
½ of
Cheetah’s
Power
Supply Bank
Filter
Bridge
Rectifier
AC
1
AC 1
Breaker
Output VDC
(-)
(+)
½ of
Cheetah’s
Power
Supply Bank
Filter
Bridge
Rectifier
AC
2
AC 2
Breaker
Figure 3-5 - International Power Supplies Configuration
In each Cheetah assembly, the entire power supply backplane is divided in half and each half is powered
and isolated separately. The following apply to the Cheetah international supply power inputs:
•
Two banks of power supplies are required in each Cheetah switcher assembly and each bank
must be capable of supplying ALL of the power that is required by the specific Cheetah
switcher.
•
Both banks must be powered under normal conditions.
•
Loss of either AC supply power feed is considered a fault condition.
•
When experiencing a loss of one AC supply power feed (fault condition), the remaining
supplies will typically operate at 100% of their rated load. An increase in chassis operating
temperature is normal as the supplies are typically changing from approximately 50% load to
approximately 100% of their rated load.
WARNING:
The maximum applied voltage between any leg of either of
the isolated AC power inputs must not exceed 250VAC. In addition, the
maximum applied voltage between any leg of one AC input and any leg of
the other AC power input must not exceed 380VAC nominal at any time.
That is, whenever two phases of a three-phase power source is applied using
different phases on each power input, the voltage between the phases must
not exceed 380VAC nominal. Failure to heed this warning will result in
serious equipment damage.
