Agilent Technologies TwisTorr Medium-TMP Mode D'emploi page 151

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 8
The set point output stays at 0 Vdc until the frequency 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).
TwisTorr Medium-TMP onboard Controller User Manual / 87-901-050-01 (B)
•
reference quantity: frequency
•
threshold: 500 Hz
•
hysteresis: 1%
•
activation type: "high level"
Set point output
Technical Information
Interconnections
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