Chapter 8: Installation and Wiring
Do-more T1H Series PLC User Manual, 1st Edition, Rev. C
8-33
Example: Small Inductive Load with Only Integrated Suppression
T h e
n e x t
example uses the same circuit as above, but with a larger 24V/ 290mA/ 7W relay, thereby
creating a larger inductive load. As you can see, the transient voltage generated is much
worse, peaking at over 50V. Driving an inductive load of this size without additional
transient suppression is very likely to permanently damage the PLC output.
Example: Larger Inductive Load with Only Integrated Suppression
Additional transient suppression should be used in both these examples. If you are unable
to measure the transients generated by the connected loads of your control system, using
additional transient suppression on all inductive loads would be the safest practice.
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