Basler Electric DGC-2020HD - Manual (Page 77)

9469300990 Rev B 67
Analog Inputs
Analog inputs provide metering for a variety of industrial transducers. An element can be configured to trip
when the metered input increases above or decreases below the user-defined threshold.
DGC-2020HD units with the resistive sender option (style number xxxxxxxxR) are equipped with two
analog inputs whereas units with the analog sender option (style number xxxxxxxxA) are equipped with
four. The identical analog input protection elements are designated Analog Input #1, Analog Input #2,
Analog Input #3 (optional), and Analog Input #4 (optional). Element logic connections are made on the
BESTlogic
™Plus screen in BESTCOMSPlus® and element operational settings are configured on the
Analog Input #x (where x = 1 to 4 (3 and 4 optional)) settings screen in BESTCOMSPlus.
BESTCOMSPlus Navigation Path: Settings Explorer, Programmable Inputs, Analog Inputs
Front Panel Navigation Path: Settings Explorer > Programmable Inputs > Analog Inputs
Input Setup
Label Text
In order to make identification of the analog inputs easier, each of the inputs can be given a user-
assigned label. The label is an alphanumeric string with a maximum of 16 characters.
Hysteresis
The hysteresis setting provides a level of hysteresis between a threshold detection tripping and dropping
out. For instance, if the hysteresis is set for 5% and the threshold is set as an over threshold, once the
threshold detection trips, the measured value must drop to 95% of the threshold before the threshold
detection will drop out. This hysteresis helps prevent rapid or repeated transitions between trip and
dropout in cases where the measured input is nearly equal to the threshold level.
If the threshold is set as an under threshold with 5% hysteresis, once the threshold detection trips, the
measured value must rise to 105% of the threshold before the threshold detection will drop out.
Input Type
An analog input can be configured to monitor a voltage or current signal. Accepted ranges for the signals
are –10 to 10 Vdc and 4 to 20 mA.
Arming Delay
A user-adjustable arming delay disables analog input protection during engine startup. If the arming delay
is set to zero (0), the input protection is active at all times, including when the engine is not running. If the
arming delay is set to a non-zero value, the input protection is inactive when the engine is not running,
and does not become active until after the engine is started and the arming delay has elapsed.
Out-of-Range Alarm Type
An out-of-range alarm alerts the user of an open or damaged analog input wire.
Ranges
Ranges must be set for the selected input type. Param Min correlates to Min Input Current or Min Input
Voltage and Param Max correlates to Max Input Current or Max Input Voltage.
Thresholds
There are four programmable thresholds for each analog input element. Each threshold has a mode
setting, threshold setting, activation delay setting, and an alarm setting.
DGC-2020HD Analog Inputs