Proface LT4300M - 5.7 Modular HMI + Control" - Manual (Page 35)

LT-4201TM/4301TM Hardware Manual
35
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:
 Reverse withstand voltage: power voltage of the load circuit x 10.
 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).
 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.