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The Power Filter Unit (PFU) is used in TJ1600 Type-2SR chassis to supply power. The unit provides a filtered input voltage of -40V to -57.6V to the chassis and the cards on the chassis.
There are two PFU cards in each system to provide input source redundancy. An EMI filter is used to restrict conducted emissions. The filters have transient voltage suppressors to prevent voltage surges affecting the system.
STATIC DISCHARGE WARNING: Static charge can damage the equipment. While handling cards for making system interconnections, wear an ESD strap to discharge the static buildup.
CAUTION: This equipment might have more than one power supply connection. All connection must be removed to de-energize the unit before accessing internal parts for maintenance or service.
DANGER: Do not jack-in/jack-out PFU card in the system with Power Cable connected. PFU has high energy and/or voltage level that can cause serious electrocution or burn.
Following figure shows the front panel diagram of the PFU:
Operational specifications of Power Filter Unit- PFU
Specification |
Range |
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Input Voltage Range |
-40V to -57.6V DC |
Reverse Polarity Protection |
Continuous |
Input Current |
11A continuous at nominal voltage, 12.5A maximum at -40V during the operation. |
Maximum operating Ambient Temperature |
-5°C to 55°C |
Output Voltage |
-40V to -57.6V DC |
Output Current |
8.68A (min) to 12.5A (min) from 40V to 57.6V, maximum power of 500W at any input voltage. |
Efficiency |
>99% Load when input is -48V DC |
Fuse |
20A Telecom fuse |
Under Voltage Protection |
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Hold-up Time (Interruption) |
0.5ms at 53.5V and above. |
Power Interface |
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Protections |
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Status Indication |
Power LED: Indicates presence of Output voltage (Green) |
Over Voltage Protection |
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Following are the functional features of the PFU: