Agilent Technologies TV 401/301 NSF Mode D'emploi page 254

17 16BTechnical Information
148BInterconnections
If a continuous signal is applied (pin 5 fixed at +24 V and pin 6 fixed
to ground) the pump speed is set to "Low Speed".
The Low Speed frequency is settable by window "117" (see para. "RS
232/RS 485 Communication Description").
Programmable analog signal: this output signal is a voltage (from 0
to 10 Vdc) linearly proportional to a reference quantity (frequency or
power) set by the user (0 V = 0 W or 0 Hz; 10 V = 150 W or 1010 Hz).
The default setting is the frequency.
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.
The open collector output needs at least an external pull-up resistor (10 kΩ for
NOTE
example) between output and pin 9 (+24 Vdc) in order to "sec" a voltage switch.
254/290 TV 401/301 NSF User Manual / 87-900-963-01 (E)