CONTROL PANEL
ETV 1591-H
24.03.2015
Page 39
6.1
General Information on the Digital Outputs
Up to 4 outputs are powered by a 24 V supply. The cross section of the +24 V
and 0 V supply must be designed for the maximum output current drawn by a group.
Caution!
When inductive loads are not equipped with a protective circuit, the high surge current flows
over the 0 V line when the load is disconnected since the internal protective circuit is wired
against 0 V An excessively long or too thin 0 V conductor can lead to undesired responses
from the outputs of the affected module.
The outputs can be turned off by disconnecting the +24 V supply voltage. Applying power to
an output whose supply voltage exceeds 0.7 V is not allowed. All outputs are electrically
protected a24V. Braking of inductive loads is limited to -24 V as shown in the graph
below. A Protective circuit connected directly to the inductive load is recommended howev-
er, to avoid system disruptions through voltage spikes (cross talk on analog lines). Howev-
er, this results in the internal voltage limit being effective only up to -0.6 V.