Lantronix
Install Guide, SISPM1040-362-LRT and SISPM1040-384-LRT-C
21
of
51
Power Connection
ATTENTION
: This case must be earth grounded. No DC input may be earth grounded. Use
Isolated Power Supply. Negative DC voltage is not supported.
Recommended Best Practice
:
First, connect the power supply to the switch while powered
off. Then connect the power supply to power, otherwise product failure may occur. To properly connect power
to the switch, follow these steps:
1.
Verify that power is off to the Power source circuit that you are going to attach to the switch PoE DC-
input connector. This can be either of the two; power supplies (AC-input or DC-input) or site source DC.
2.
As an added precaution, place an appropriate safety flag and lockout device at the source power circuit
breaker, or place a piece of adhesive tape over the circuit breaker handle to prevent accidental power
restoration while you are working on the circuit.
3.
Insert the negative/positive DC wires into the V- and V+ terminals, respectively.
4.
To keep the DC wires from pulling loose, use a small flat-blade screwdriver to tighten the wire-clamp
screws on the front of the terminal block connector.
5.
Insert the terminal block connector prongs into the terminal block receptor.
6.
Insert the negative/positive DC wires into the power supply
V-
and
V+
terminals and tighten. See
Power
Supply Features and Specifications
on page
37
.
7.
Plug the power supply into an appropriate AC outlet.
8.
Check the
SYS
LED. If it is ON, the power connection is correct.
Figure 8: Connecting DC Power
Power Disconnection
To disconnect power from the switch after a successful boot, follow these steps:
1. Turn off power to the power supply that is powering the switch.
2. Make sure the Power LED is off on both the switch and power source.
3. Disconnect the cables.
