Basler Electric DGC-2020HD - Manual (Page 69)

9469300990 Rev B 59
Sender Failure Detection
The DGC-2020HD can be configured to annunciate a pre-alarm or alarm when a loss of signal is detected
at the coolant temperature, oil pressure, or fuel level sender input. Loss of signal is determined differently
for resistive senders than for analog senders. When the DGC-2020HD is equipped with resistive senders
(style number xxxxxxxxR), an open or short across the input terminals is considered to be a loss of signal.
When the DGC-2020HD is equipped with analog senders (style number xxxxxxxxA), any value outside of
the user-defined range is considered a loss of signal. Refer to the Analog Inputs chapter for details on
analog sender range settings.
The speed sender fail alarm is always enabled. A user-adjustable time delay is provided for each
sender/sensing alarm/pre-alarm.
Alarm and pre-alarm annunciations for loss of engine speed signals are not user-programmable and
operate as follows. If the MPU (magnetic pickup) or generator frequency is programmed as the sole
engine speed source and that signal source fails, an alarm (and shutdown) is triggered. If the engine
speed source is configured as MPU and generator frequency and a loss of one of the signal sources
occurs, a pre-alarm is annunciated. An alarm (and shutdown) is triggered if both speed signals are lost.
The BESTCOMSPlus Sender Fail screen is illustrated in Figure 23 and is found in the Settings Explorer
under Alarm Configuration.
Figure 23. Settings Explorer, Alarm Configuration, Sender Fail Screen
Table 29. Settings for Sender Fail Screen
Locator Setting Range Increment Unit
A Alarm Configuration
Status Only, Pre-
Alarm, or Alarm
n/a n/a
B Activation Delay 300 to 1,800 1 seconds
C Alarm Configuration
Status Only, Pre-
Alarm, or Alarm
n/a n/a
D Activation Delay 0 to 300 1 seconds
E Alarm Configuration
Status Only, Pre-
Alarm, or Alarm
n/a n/a
F Activation Delay 0 to 300 1 seconds
DGC-2020HD Engine Sender Inputs