© EPRAD Incorporated
Events
These three Line Voltage events can be assigned to triggers.
Line Voltage Low
- This event occurs when the line voltage goes below the ‘Lower Voltage
Threshold’, V
TL
for a time greater than the ‘Voltage Low Event Hold-Off Time’, T
VLH
.
Line Voltage OK 1
- This event can only occur inside the ‘Voltage Low Window’. This event occurs
when the line voltage returns to the okay condition and remains okay for a time greater than the
‘Voltage OK Event Hold-Off Time’, T
VOH
.
Line Voltage OK 2
- This event can only occur outside the ‘Voltage Low Window’. This event occurs
when the line voltage returns to the okay condition and remains okay for a time greater than the
‘Voltage OK Event Hold-Off Time’, T
VOH
.
This diagram illustrates how the Line Voltage events can be generated. The red line represents the
line voltage. When the voltage drops below the Lower Voltage Threshold, V
TL
, the Voltage Low Hold-
off, T
VLH
, and the Voltage Low Window, T
VLW
, timers start to tick. If the Voltage Low Hold-off timer,
T
VLH
, is allowed to expire, the Line Voltage Low Event is generated. If the voltage goes above the
Upper Voltage Threshold, V
TU
,
before
the Voltage Low Window timer, T
VLW
, expires, the Voltage Okay
Hold-off timer, T
VOH
, starts to tick. If this timer is allowed to expire, the Line Voltage OK 1 Event is
generated. If the voltage goes above the Upper Voltage Threshold, V
TU
,
after
the Voltage Low
Window timer, T
VLW
, expires, the Voltage Okay Hold-off timer, T
VOH
, starts to tick. If this timer is
allowed to expire, the Line Voltage OK 2 Event is generated.
• The Voltage Low Hold-off timer, T
VLH
, is reset if the voltage goes above the Upper Voltage
Threshold, V
TU
and the Line Voltage Low event will not be generated.
• The Voltage Okay Hold-off timer, T
VOH
, is reset if the voltage falls below the Lower Voltage
Threshold, V
TL
, and the Line Voltage OK 1 or the Line Voltage OK 2 event will not be generated.
• The Voltage Low Window timer, T
VLW
, is reset if the voltage goes above the Upper Voltage
Threshold, V
TU
.
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eCNA-10 Operation and Installation Manual Version 1.270-00
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