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C
HEETAH
S
ERIES
S
WITCHERS
– C
HAPTER
11
81-9059-0570-0 Rev. C
Proprietary Information of PESA S
WITCHING
S
YSTEMS
, I
NC
. 140
Chapter 11: Operational Descriptions
and Card/Module Installations
This section documents the operational descriptions of the various components of the Cheetah Series
Switchers. Typically, this section is accessed for more concise component information and how each
component is used in the Cheetah Series systems.
Additionally, this section will describe the installation of the various components of the Cheetah Series
Switchers. Even though the unit is shipped with all of the components preinstalled, this section is
typically accessed for basic component information and for their replacement (removal and installation)
sequences.
11.1 C
HEETAH
S
ERIES
P
OWER
S
UPPLIES
11.1.1 Cheetah Series Power Supply Information
Cheetah Series Power Supplies contain electrical shock hazards and should
only be serviced by qualified service personnel with experience in servicing
off-line switching regulators.
There are no user serviceable parts contained in the Cheetah Series Power
Supplies. All service performed on the Power Supplies should be performed
by the PESA Service Department.
High Leakage Current at 240VAC. The Cheetah Series Power Supply
leakage current exceeds 3.5mA when used at 240 VAC because of leakage
through emission filter capacitors.
The Cheetah Power Supply is responsible for providing a regulated ±28VDC @22A to the switching
frame. The Cheetah Power Supply is designed to operate automatically with input AC line voltage
ranges from 95-240 VAC and with AC line frequencies of 50/60 Hz. All Cheetah power supplies
have built-in, over-current protection circuitry. When two or more supplies are used, each supply is
electrically connected to a common/dedicated buss within the chassis and from there, to the fuse block
for overcurrent protection and distribution.
Additionally, each power supply contains dual internal fan controller systems that are isolated from
the main DC power output buss connections. Depending on the chassis, there are dependent power
supply installation configurations to satisfy the fan operations, which are described in each chassis
power supply locations and allocations configuration in this section.
In the event of a Cheetah Power Supply failure, return the malfunctioning unit to the PESA Service
Department for replacement. The power supplies contain lethal voltages when operating and should
only be serviced by the PESA Service Department. Please call the PESA Service Department for a
RMA number before returning any units for replacement. The Service Department’s phone number is
listed on the front page of this manual.