5
| Switch Design
Wieland Electric GmbH | BA001106 (Rev. A) | 01/2017
13
5.7
Power connection
•
The device only supports the voltage outlined in the type plate. Do not use any other power compo-
nents except those specifically designated for the switch device.
•
Properly ground the device before connecting. Lack of a proper grounding setup may result in a safety
risk and could be hazardous.
•
Do not service equipment or cables during periods of lightning activity.
•
Do not service any components unless qualified and authorized to do so.
•
Do not block air ventilation holes.
5.7.1
Grounding the device
Electromagnetic Interference (EMI) affects the transmis-
sion performance of a device. By properly grounding the
device to earth ground through a drain wire, you can
setup the best possible noise immunity and emissions.
5.7.2
Overview
The switch can be powered by using the same DC
source used to power other devices. A DC voltage range
of 24 V or 48
V DC
must be applied between the V1+ ter-
minal and the V1- terminal (PWR1), see the following il-
lustrations. A Class 2 power supply is required to main-
tain a UL60950 panel listing. The chassis ground screw
terminal should be tied to the panel or chassis ground.
A redundant power configuration is supported through a
secondary power supply unit to reduce network down
time as a result of power loss.
The switch supports 24 and 48
V DC
. Dual power inputs
are supported and allow you to connect a backup power
source.
•
The Terminal Block (CN1) is suitable for 14-22 AWG (0.35 - 2.5 mm
2
). Torque value 5,6 lb-in.
•
The cross sectional area of the earthing conductors shall be at least 3.31 mm
2
.
•
Calculate the maximum possible current for each power and common wire. Make sure the power
draw is within limits of local electrical code regulations.
•
For best practices, route wiring for power and devices on separate paths.
•
Do not bundle together wiring with similar electrical characteristics.
•
Make sure to separate input and output wiring.
•
Label all wiring and cabling to the various devices for more effective management and servicing.
WARNING
Connection to grounding point
Drain wire with lug