Agilent Technologies TV 801 Navigator Bedienungshandbuch Seite 221

Fault: this open collector output signal is ON when a system fault
condition is detected.
Programmable set point: this open collector output signal is enabled
when the reference quantity chosen (frequency, current or time) is
higher than the set threshold. The signal can be "high level active" (that
is the output is normally at 0 Vdc and becomes 24 Vdc when activated),
or "low level active" (that is the output is normally at 24 Vdc and
becomes 0 Vdc when activated). Moreover, if the reference quantity is
the frequency or the current drawn, it is possible to set the hysteresis
(in % of the threshold value) to avoid bouncing.
For example:
Figure 13
The set point output stays at 0 Vdc until the fre-quency becomes
higher than 505 Hz (that is 500 Hz + 1% of 500 Hz), then the output
goes at 24 Vdc and stays at 24 Vdc until the frequency be-comes
lower than 495 Hz (that is 500 Hz – 1% of 500 Hz).
It is possible to delay the set point checking for a programmable
delay time.
TV 801 Navigator User Manual / 87-900-953-01
reference quantity: frequency
threshold: 500 Hz
hysteresis: 1%
activation type: "high level"
Set point output
Technical Information
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Interconnections
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