PD2-6210
Helios Large Display Analog Input Batch Controller Instruction Manual
43
Total Relay Sampling Operation
When the batch total reaches the set point, the relay trips and the sample time starts. After the sample
time has elapsed, the relay resets. The cycle repeats every time the set point value is added to the batch
total.
Signal Loss or Loop Break Relay
Operation
The following graph shows the loop break relay
operation for a high alarm relay.
When the meter detects a break in the 4-20 mA
loop, the relay will go to one of the following
selected actions:
1. Turn
On
(Go to alarm condition)
2. Turn
Off
(Go to non-alarm condition)
3. Ignore (Processed as a low signal
condition)
Time Delay Operation
The following graphs show the operation of the
time delay function.
When the signal crosses the set point, the
On
time
delay timer starts and the relay trips when the time
delay has elapsed. If the signal drops below the
set point (high alarm) before the time delay has
elapsed, the
On
time delay timer resets and the
relay does not change state. The same principle
applies to the
Off
time delay.
Note: If “Automatic or Manual (
A-mAn
)” reset
mode is selected, the LED follows the reset
point and not the relay state when the relay
is acknowledged.
Relay
LED
Input
Loop Break = Ignore
de-energized
energized
off
on
Relay
LED
Loop Break = Off
Relay
LED
Loop Break = On
Set
Reset
www.calcert.com
1.888.610.7664
0
5
10
15
20
25
30
