Lantronix
SM24TBT2DPB Install Guide
33845 Rev. B
Page
28
of
48
Replacing a High Voltage (HVAC/HVDC) Power Supply
The switch requires two power supplies for redundancy. With one power supply providing the necessary power for
operations, you can replace the other power supply during operations.
Before you begin
:
•
The replacement power supply must have the same wattage as the power supply being replaced.
•
An HVAC/HVDC power source must be within reach of the power cable that will be used with the replacement
power supply. If you are using n+n power redundancy, there must be a separate power source for each
power supply installed in the chassis.
•
There must be an earth ground connection to the chassis in which you are installing the replacement power
supply. HVAC/HVDC power supplies connected to AC power sources are automatically grounded by their
power cable when connected to the power supply and AC power source. HVAC/HVDC power supplies
connected to DC power sources have Saf-D-Grid power cables with three connectors on the power source
end; you connect one of those connectors to the earth ground.
Step 1: Remove an HVAC/HVDC Power Supply
as follows:
a)
Turn off the circuit breaker for the power feed to the power supply that you are replacing. Be sure that the LEDs
turn off on the power supply that you are removing.
b)
Remove the power cable from the power supply by pressing the tab on the top of the Saf-D-Grid connector and
pull the cable and connector out of the power supply.
c)
Grasp the power supply handle while pressing the colored release latch towards the power supply handle.
d)
Place your other hand under the power supply to support it while you slide it out of the chassis.
Caution
: Do not touch the electrical connections on the back side of the module and prevent anything else from
contacting and damaging the connectors.
Step 2: Install the Replacement Power Supply
as follows:
a)
Holding the replacement power supply with one hand underneath the module and the other hand holding the
handle, turn the power supply so that its release latch is on the right side and align the back end of the power
supply (the end with the electrical connections) to the open power supply slot before carefully sliding the power
supply all the way into the slot until it clicks into place.
Note
: If the power supply does not fit into the open slot, turn the module over before sliding it carefully into the
open slot.
b)
Test the installation by trying to pull the power supply out of the slot without using the release latch. If the
power supply does not move out of place, it is secured in the slot. If the power supply moves, carefully press it all
the way into the slot until it clicks in place.
c)
Attach the Saf-D-Grid end of the adapter cable to the electrical outlet on the front of the power supply.
d)
Attach the other end of the Saf-D adapter cable to the IEC end of the power cable.
•
For an AC power source, plug the other end of the power cable into the AC power source.
•
For a HVDC power source, cut off the receptacle end of the Saf-D adapter cord, and strip the insulation
on each wire back approximately 0.25" (6mm). Twist the stranded wire ends to facilitate connection of the
wires to an appropriate DC power source of your choice, ensuring the specifications meet the designated
DC power requirements as listed previously in this Guide. Verify that the circuit breaker is turned off and
then connect each of the three cable connectors to the appropriate DC and grounding terminals on the
power source. If there is a cover plate for the DC terminals, install the plate to prevent accidental contact
with the terminals.
e)
If using an HVDC power source, turn on the circuit breaker for the power source.
f)
Verify that the power supply is operational by making sure that the power supply LED is green.
g)
If using Digital Electricity (DE), follow the DE equipment provider's instructions to connect the Saf-D plug on the
cable to the Saf-D receptacle on the switch's power. Note: Digital Electricity is a trademark of VoltServer. For
more information about Digital Electricity, visit