Pro-face LT series, Hardware Manual

Page: 36 / 143

LT System General Rules for Implementing
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Protective circuit B: this protection circuit can be used for DC load power circuits and
source outputs (positive logic).
Protective circuit B: this protection circuit can be used for DC load power circuits and
sink outputs (negative logic).
Use a diode with the following ratings:
z
Reverse withstand voltage: power voltage of the load circuit x 10.
z
Forward current: more than the load current.
Protective circuit C: this protection circuit can be used for DC load power circuits and
source outputs (positive logic).
Protective circuit C: this protection circuit can be used for DC load power circuits and
sink outputs (negative logic).
z
In applications where the inductive load is switched on and off frequently and/or
rapidly, ensure that the continuous energy rating (J) of the varistor exceeds the
peak load energy by 20% or more.