Configurable Digital Outputs - Santerno DCREG2 Series User Manual

15P0059B3
USER MANUAL
6.8

CONFIGURABLE DIGITAL OUTPUTS

DCREG drive is provided with 5 digital outputs (relay normally open contact). Any output may be assigned
to some configurations: for further details, see the chapter relating to par. P170(176)(182)(188)(194) and
to the others chapters relating to the configurable digital outputs.
Depending on the configuration assigned, every output enables either when a certain logic condition
occurs (e.g. 3:Motor at Speed) or when an analog quantity exceeds a certain level (e.g. 8:Ifld Threshold).
In both cases, the drive may be programmed in order to have a particular delay before enabling or
disabling the digital output.
At the same time, the logic may be defined, i.e. the digital output enabling determines the relay excitation
(so the contact closing) or the relay disexcitation (so the contact opening).
Moreover, if the digital input is to be enabled when an analog quantity exceeds a particular level, the
enabling level and the hysteresis - necessary to avoid any relay high frequency vibration when the
relevant analog quantity is near the level chosen - are to be defined.
For instance, suppose configurable digital output MDO1 is to be enabled when the armature current
reaches 38% of the drive nominal current. A hysteresis is to be entered in said current threshold, equal to
10% of the current level chosen. The output enabling is to have a 10-second delay. The output disable is
to have a 18 seconds delay.
In order to obtain this, the following setup is required:
P170 = 2:Iarm Threshold
P173 = 38%
P174 = 10%
P171 = 10 s
P172 = 18 s
The first diagram in the following figure shows a possible trend of the time-depending armature current.
The second diagram shows MDO1digital output enabling and disabling. The third and fourth diagram
show the physical state of the contact at terminals 25-27 respectively, provided that the logic setup is the
following:
P175 = 0:Normally Open
or
P175 = 1:Normally Closed.
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