22 MicroLogix 1400 Programmable Controllers
Publication 1766-IN001D-EN-P - June 2015
Spade Lug Recommendation
The diameter of the terminal screw head is 5.5 mm (0.220 in.). The input and output
terminals of the MicroLogix 1400 controller are designed for the following spade lugs. The
terminals will accept a 6.35mm (0.25 in.) wide spade (standard for #6 screw for up to 14
AWG) or a 4 mm (metric #4) fork terminal.
When using spade lugs, use a small, flat-blade screwdriver to pry the finger-safe cover from
the terminal blocks, then loosen the terminal screw.
Surge Suppression
If you wire the terminal block with the finger-safe cover removed, you may not
be able to put it back on the terminal block if the wires are in the way.
Inductive load devices such as motor starters and solenoids require the use of
some type of surge suppression to protect the controller output. Switching
inductive loads without surge suppression can significantly reduce the life of
relay contacts or damage transistor outputs. By using suppression, you also
reduce the effects of voltage transients caused by interrupting the current to
that inductive device, and prevent electrical noise from radiating into system
wiring. Refer to the MicroLogix 1400 Programmable Controller User Manual,
publication 1766-UM001
, for more information on surge suppression.
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