Accsense
VersaLog Data Loggers User’s Manual
Page 34
Alarm1 and A2/EXT can be associated with alarm state and/or excitation control. Please refer
to Alarm Output and Excitation Control for details.
Alarm Output
The logger will be in a state of alarm if
ALL
of the following conditions are met:
1.
Channel alarms are enabled.
2.
The logger is logging the data.
3.
Current sampled reading is beyond low or high alarm thresholds.
4.
Alarm-On Delay counter has moved down to zero.
When the logger is in alarm state, Alarm1 and/or A2/E terminal strips can be configured by
Accsense VersaLog to be activated certain time after an alarm was triggered. The delay time
selections are: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 minutes.
The following alarm output combinations can be set by Accsense VersaLog:
Alarm1 & A2/E Options
Description
Disable any output -> Alarm1 and A2/EXT
No output connects to Alarm1 and
A2/E terminals.
High alarm -> A2/EXT only
High-alarm state controls A2/EXT
terminal.
Low alarm -> Alarm1 only
Low-alarm state controls Alarm1
terminal.
High alarm -> A2/EXT and low alarm -> Alarm1
High-alarm state controls A2/EXT
terminal and low-alarm state controls
A1 terminal.
High alarm and low alarm -> Alarm1
Both high and low alarm states control
A1 terminal.
Excitation control -> A2/EXT
Excitation controls A2/EXT terminal.
Excitation control -> A2/EXT and both alarms ->
Alarm1
Excitation controls A2/EXT and both
high and low alarm states control
Alarm1 terminal.
Excitation control -> A2/EXT and low alarm ->
Alarm1
Excitation controls A2/EXT terminal
and low alarm state controls Alarm1
terminal.
Excitation control -> A2/EXT and high alarm ->
Alarm1
Excitation controls A2/EXT terminal
and high alarm state controls Alarm1
terminal.
The following schematics illustrate the physical connections required to control and drive an
external device by the alarm output:
