Seko K500 TB Manuel D'installation page 32

By programming an OFF value higher than the ON value (fig. 12.b), a DOWNWARD threshold
functionality can be obtained (when the value descends below the value of ON, the relay is enabled
and remains active until the value exceeds the value of OFF). See fig.12.
a)
b)
The Time ON and Time OFF parameters can also be used to set a DELAY time or a TIMING
function for Relay 1 during its activation.
The ON and OFF times can be programmed with either negative or positive values. (fig. 13)
If Negative Times are programmed, the DELAY function is enabled:
Ex. ON Time: –5sec , OFF Time -10sec. (fig. 13.a)
When the threshold is enabled, the relay will close after 5 seconds (ON Time) and will remain
closed for the entire time in which the threshold is enabled. Once the threshold is disabled, the relay
will remain closed for another 10 seconds (OFF Time) before opening.
If Positive Times are programmed, the TIMING function is enabled:
Ex. ON Time: 5sec , OFF Time 10sec. (fig. 13.b)
When the threshold is enabled, the relay will alternate between its open and closed positions based
on the programmed times. In the case of the example, the relay will close for 5 seconds (ON Time)
and will subsequently open for 10 seconds (OFF Time). This cycle will continue until Threshold 1
is disabled.
0000137221
Measurement
THRESHOLD ENABLED
Figure 12 – Threshold functionality
Rev. 3.1
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