Agilent Technologies Turbo-V 2K-G Notice De Mode D'emploi page 314

17 Technical Information
Interconnections
For example:
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The set point output stays open until the frequency becomes higher
than 505 Hz (that is 500 Hz + 1% of 500 Hz), then the output goes
closed and stays colsed until the frequency becomes lower than 495
Hz (that is 500 Hz – 1% of 500 Hz).
It is possible to mask the set point checking for a programmable mask
time (window 103).
The SET POINT signal has the following default settings:
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reference quantity: frequency (window 101=0)
threshold: 500 Hz (window 102=500)
hysteresis: 1% (window 103=1)
activation type: "active close" (window 104=1)
reference quantity: controller status
thereshold: not relevant
hysteresis: not relevant
activation type: active close (NO)
delay time: 0 second
Turbo-V 2K-G Pumping System User Manual / 87-900-968-01 (H)