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TECHNICAL TRAINING

Tech Tip Bundle

By: Donald Dougherty, Senior Technician

Wago Operating Tools:

Machines in our Loram fleet use connections that are known as
“high density” terminal blocks made by the WAGO company. They
provide an efficient use of space, are reliable, and are easy to termi-
nate using the special WAGO operating tools. These tools look a
lot like a common screwdriver but are designed specifically to oper-
ate the lever action and fully open the terminal. Thus, making it easy
to insert the appropriate size wires without having to twist them.
Another advantage is the tool will remain in the block allowing you
handle wires etc. without losing your place on the strip. These tools
are available at Newark Element 14, Amazon, and other retailers
that carry WAGO products. A complete set of 3 sells for around
$35.00 and can be ordered under WAGO part # 210-722.

Flush Cuts for Less Cuts:

Putting on a lot Ty-wraps? Zip ties? etc.? Don’t forget to cut off the
left-over tail ends. It’s important to use a pair of flush-cut diagonal
pliers. Using regular diagonal cutters to trim ty-wraps will leave
sharp edges that although plastic, can cut skin and cause injury. Flush
cut diagonals are purpose built to leave a smooth surface and will
only cut smaller wires and plastic, so you’ll still need bigger cutters
for the tough stuff.

4-20 mA current Loops:

A common method of receiving feedback from the various systems employed on Loram machines are 4-20 mA
current loops. Sharing a history that goes back to the early 3-15 PSI pneumatic systems for process control.
Modern electronics lead to the advent of 4-20mA current loops. Using only two wires, they provide better feed-
back, robust noise reduction, long distance, and are quite reliable.
Operation and Troubleshooting:

4-20mA circuits consist of a power source, a sensor/pickup for detecting pressure, temperature, etc. and a re-
ceiver to change the 4-20mA signal into a value displayed on the control system. A variable current will flow
through the transmitter depending on what the transmitter detects. For example, 0-1000 psi pressure transducer
will pass a 4mA signal at zero psi and 20mA at 1000 psi. For troubleshooting purposes our PLC’s monitor and
display the current of each channel. This information can be viewed by accessing the PLC layout screens on the

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