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Chapter 3: Hardware Installation
3.3 Wiring
WARNING:
Do not disconnect modules or wires unless power has been switched off or the area is known to be non-hazardous. The devices
may only be connected to the supply voltage shown on the type plate.
ATTENTION:
1. Be sure to disconnect the power cord before installing and/or wiring your switches.
2. Calculate the maximum possible current in each power wire and common wire. Observe all electrical codes dictating the
maximum current allowable for each wire size.
3. If the current goes above the maximum ratings, the wiring could overheat, causing serious damage to your equipment.
4. Use separate paths to route wiring for power and devices. If power wiring and device wiring paths must cross, make sure the
wires are perpendicular at the intersection point.
5. Do not run signal or communications wiring and power wiring through the same wire conduit. To avoid interference, wires
with different signal characteristics should be routed separately.
6. You can use the type of signal transmitted through a wire to determine which wires should be kept separate. The rule of
thumb is that wiring sharing similar electrical characteristics can be bundled together.
7. Separate input wiring from output wiring.
8. Label the wiring to all devices in the system.
3.3.1 Grounding
Grounding and wire routing help limit the effects of noise due to electromagnetic interference (EMI). Run the ground connection
from the ground screws to the grounding surface prior to connecting devices.
3.3.2 Fault Relay
The relay contact of the 2-pin terminal block connector is used to detect user-configured events. The two wires attached to the
fault contacts form an open circuit when a user-configured event is triggered. If a user-configured event does not occur, the fault
circuit remains closed.
3.3.3 Redundant Power Inputs
The LE2700 Series Hardened Managed Modular Switches switches support dual redundant power supplies, Power Supply 1
(PWR1) and Power Supply 2 (PWR2). The connections for PWR1, PWR2 and the RELAY are located on the terminal block.
Step 1: Insert the negative/positive DC wires into the V-/V+ terminals, respectively.
Step 2: 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.
Step 3: Insert the plastic terminal block connector prongs into the terminal block receptor.
Figure 3-7. Redundant power inputs.