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Back to Customer Replaceable Units
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In this section:
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Overview
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configured for DC power can accommodate dual redundant DC
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power supplies, as shown in figure DC Power Supply.
The DC
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power supply is a Customer Replaceable Unit (CRU). The product code is SBC-5400-PSUDC.
Anchor DC Power Supply DC Power Supply
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In a dual redundant
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power supply configuration, the Power Supplies are hot-swappable meaning that a
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power supply may be replaced without powering down the
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one power supply is operational).
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| Before replacing a |
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| power supply in a redundant |
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| power supply configuration, verify the status of the redundant |
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| power supply. The “POK” LED status must be “solid green”. Removing the |
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| power supply when the redundant |
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| power supply does not show a solid green status, may cause the system to power down. Contact Sonus Customer Support if required. |
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Parts and Tools Required
- Electrostatic discharge (ESD) strap
- Replacement DC supply.
- A #2 Phillips-head screwdriver
- Torque driver with #2 Phillips bit
- Voltmeter
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| The chassis is shipped with one |
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| power supply, unless a second |
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| power supply is added |
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| at the time the order is placed. |
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To prevent damage from electrostatic discharge, an ESD strap is provided in the accessory kit. |
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Refer to Connecting ESD Wrist Strap to install it. |
Replacing a Power Supply
Perform the following procedure to replace a
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power supply:
- Attach an Electrostatic Discharge (ESD) wrist strap to the ESD grounding point on the back of the chassis, and place the other end around your wrist (see Connecting Electrostatic Discharge Wrist Strap for details).
- Disconnect -48VDC power to the DC
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- power supply being replaced by shutting off circuit breaker or removing fuse on facilities power distribution panel or similar operation.
- Verify the POK LED is off on the DC
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- power supply being replaced.
- Ensure that power is no longer present on power cables using a voltmeter.
Remove clear plastic protective cover on terminal strip.
Caption 0 Figure 1 Removing the plastic protective cover 
Disconnect RTN and -48V connections by loosening two terminal strip screws using the #2 Philips screwdriver.
Caption 0 Figure 1 Disconnecting the RTN and -48V connections 
- Disconnect
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- power supply ground connection by removing the screw securing the green chassis ground wire to the DC
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- power supply using the #2 Philips screwdriver.
- Disengage the DC
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- power supply latch by moving the latch to the left.
- Pull on the loop handle to slide the DC
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- power supply out of the SBC chassis.
- Install the replacement DC
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- power supply into the
chassis by sliding it forward until the latch clicks in place.Spacevars 0 product - Reconnect the
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- green power supply ground wire to the DC
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- power supply using the torque driver supply and tighten the screw to 13.9 in/lb.
- Reconnect the RTN and -48V cables to the terminal strip screws and tighten to 13.9 in/lb using the torque driver.
- Reinstall the clear plastic protective cover on the terminal strip.
- Apply power to the
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- DC power supply by turning the circuit breaker or installing the fuse on facilities power distribution panel or similar operation.
- Verify that the POK green LED on the newly-replaced
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- power supply is solid green.
- From the application, verify that no
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- power supply alarms are generated.
CRU Storage
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All
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The storage environment for these CRUs is:
- Humidity must be less than 95% (non-condensing)
- Temperature must be between -40C and +70C.
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Overview
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