Agilent Technologies Turbo-V 903 Notice De Mode D'emploi page 272

18 Technical Information
Earth (ground) Connection
Contact: this output signal (OPTOMOS solid state relay) is enabled when the
reference quantity chosen (frequency, current, time) is higher than the set
threshold. The signal is "normally open" (it will close the circuit when
activated) or "normally close".
The factory default setting are:
These setting can be changed by serial interfaces (see "windows meaning"
table: windows 101 to 105). The same settings are used by the "programmable
set point".
Speed setting: PWM input signal 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 signal
NOTE
Programmable analog signal: this output signal is a voltage (from 0 to 10 Vdc)
proportional to a reference quantity (frequency or power) set by the user. The
default setting is the frequency (see the following example diagram).
272/306
Frequency: 720 Hz (90% of the max rotational frequency)
Hysteresis: 2%
Activation type: normally open
Delay time: 0 sec.
frequency: 100 Hz +/-20%
amplitude: 24 V max
duty cycle range: from 25% to 75%
corresponding to an output frequency from 300 Hz to 800 Hz linearly.
Turbo-V 903 Pumping System User Manual / 87-901-016-01 (A)