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CONTROL PANEL
ETV 1591-H
24.03.2015
Page 41
6.3
Additional Protective Circuit
Each group of 4 outputs is also protected internally against 24V/3 to 24V/4. Braking of in-
ductive loads is limited to
– 12.7 V as shown in the graph below. However, an additional
protection circuit directly on inductive loads is recommended (freewheeling diode) to avoid a
system failure caused by voltage spikes (cross talk on analog lines). However, this results
in the internal voltage limit being effective up to -0.7 V only.