Hach sc200, Руководство пользователя

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Sixnet Slim Line Switch Installation Guide Page 18 of 30
Section 4 Power and Output Wiring
Overview
These industrial Ethernet switches can be powered from the same DC source that is used
to power your other devices. A voltage in the range of 10 to 30 VDC needs to be applied
between the P1 (plus) terminal and the Minus terminal as shown in the diagrams on the
next page. The chassis screw terminal should be tied to panel or chassis ground. To
reduce down time resulting from power loss, these industrial Ethernet switches can
optionally be powered redundantly with a second power supply as shown in the diagrams.
The managed models also have an “OK” output that can be tied to a PLC input or other
device to indicate when there is a power loss. When ON, this output will source the same
voltage that is applied to the switches power terminals. See the wiring diagrams on the
next page.
Screw Torque
When tightening the screws be careful to tighten to a max. torque of 5 in/lb (0.57 Nm).
WIRING
WARNINGS
BEFORE PERFORMING ANY WIRING TO THESE SWITCHES MAKE SURE …
x
THE AREA IS CURRENTLY NONHAZARDOUS (ESPECIALLY WHEN
WORKING IN CLASS I, DIV 2 OR ZONE 2 HAZARDOUS LOCATIONS)
x
TO TURN OFF THE POWER TO THE SWITCH
x
TO UNPLUG THE SCREW TERMINAL BLOCK (This is especially important on
the units that have a metal case as shown below. Connecting or disconnecting
wires to the screw block when it is in place and the power is turned on can
allow the screwdriver to short the power to the case.)
UL Requirements
To meet the requirements for UL you must do one of the following:
1. Install a 3.33 Amp maximum fuse at the input of the switch.
OR
2. Use a Class 2 rated power supply to power the switch.
TO PREVENT
SHORTING THE
POWER TO THE
CASE ALWAYS
UNPLUG THE
SCREW
TERMINAL
BLOCK BEFORE
PERFORMING
ANY WIRING!