Agilent Technologies Turbo-V 1K-G Bedienungshandbuch Seite 252

17 Technical Information
Interconnections – Controller Model 9698978M004
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:
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Figure 13
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 becomes 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.
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reference quantity: frequency
threshold: 500 Hz
hysteresis: 1%
activation type: "high level"
Set point output
Turbo-V 1K-G Retrofit User Manual / 87-900-996-01 (B)