Echelon SmartServer 2.2 Hardware - Manual (Page 18)

Connecting the Screw Terminals
The SmartServer has two rows of screw terminals located on the top and bottom edges of the
enclosure. The screw terminals on the bottom row are numbered 1 to 12 (from left to right), and the
screw terminals on the top row are numbered 13 to 28 (from right to left). There is no polarity for DC
connections.
The screw terminals accept 0.22mm – 3.3mm (22 – 12AWG) gauge solid wire. The optimum
tightening torque for the screw terminals is 0.75 Newton-meters (6 lbs. in.) maximum. The ideal
flathead screwdriver tip width for use with the screw terminal connectors is 3mm (0.12”). Strip wires
to a length of 7mm (0.28”). Optionally, you can use a soldering iron to tin the stripped lengths of any
stranded wires to prevent fraying and inadvertent contact with adjacent terminals.
The screw terminals are divided into the following groups, which are each detailed in the subsequent
sections.
• Power supply
• L
ON W ORKS network
• RS-232/RS-485 serial ports
• Digital outputs
• Pulse meter inputs
• Digital inputs
• +12V<20mA output
Power Supply
The SmartServer is powered by a 100/240V AC, -6% to +10%, 50/60Hz VAC power mains
connection.
!
Safety Warning
When connecting a unit, always connect earth ground first, then Neutral, and then Line.
This minimizes the risk of shock or damage should power inadvertently be present on
Line.
!
Safety Warning
Fuse F350 in the SmartServer uses a Wickmann rated 250 VAC, .5 A, SLO-BLO fuse,
and it is not field replaceable
.
6 Assembling the SmartServer Hardware