Agilent Technologies TwisTorr Medium Notice De Mode D'emploi page 218

17 Technical Information
Connection J1 Remote I/O Interconnections
The contact logic is configured depending on Activation Type
parameter status. If Activation Type is "high level active" the contact
is configured as "normally open" (it will close the circuit when
activated), if Activation Type is "low level active" the contact is
configured as or "normally closed" (it will open the circuit when
activated).
Then the default factory setting for this contact output is normally
open.
SPEED SETTING: PWM input signal (opt isolated) to set the pump
speed. The PWM signal characteristics must be the following:



The duty cycle percentage is referred to the low level portion of the PWM
NOTE
signal
High Speed is the nominal rotational frequency of the pump (825 or 725 Hz).
NOTE
Low Speed (680 Hz) corresponds to the rotational frequency for a stand by
status. Users can set rotational frequency between these two values.
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frequency: 100 Hz +/-20 %
amplitude: from 5 to 24 V
duty cycle range: from 25 % to 75 % (t
rotational frequency from 680 Hz to FMAX Hz linearly. With duty
cycle <25 % rotational frequency = 680 Hz, with duty cycle >75 %
rotational frequency = 825 Hz for X3501-64016 or 714 Hz for
X3501-64006
TwisTorr Medium-TMP Rack Controller User Manual / 87-901-049-01 (B)
/T) corresponding to a
off