Agilent Technologies Turbo-V 2K-G Notice De Mode D'emploi page 312

17 Technical Information
Interconnections
High Speed is the nominal rotational frequency of the pump (555Hz). Low Speed
NOTE
(475 Hz) corresponds to the rotational frequency for a stand by status, to
preserve the bearing life. Users can set rotational frequency between these two
values.
If any signal isn't applied (no connection) the driving frequency is set
to "Maximum excitation frequency" (the default value is 555 Hz; it is
settable via serial line by means of window 121: see the serial
command table).
If a continuous signal is applied (pin 5 connected to pin 9) the
driving frequency is set to "Low Speed" (the default value is 475 Hz;
it is settable via serial line by means of window 117: see the serial
command table).
The "Low Speed" function can also be activated by serial line with
win.001, and the low speed value can be adjusted via serial command
win.117.
Both low speed value (win.117) and high-speed value (win.120) are
limited between 475Hz (can't be set by the user) and "Maximum
excitation frequency" (win.121, 555Hz default).
The duty cycle percentage is referred to the low level portion of the PWM
NOTE
period.
SOFT START: input signal to activate the soft start function. This
function must be activated (pin-7 shorted with pin-9) if the pump
remains unused for 1 month or more, and de-activated for the next
run-up. The soft Start phase is around 55 minutes long. The soft start
function is factory enabled for the first system start-up. After the first
pump start-up until the normal status, the soft start is automatically
disabled.
ANALOG OUTPUT: this output signal is a voltage (from 0 to 10 Vdc)
proportional to a reference quantity (frequency or power) set by the
user through serial line (window 111). The default setting is the
frequency (see the following example diagram).
312/360 Turbo-V 2K-G Pumping System User Manual / 87-900-968-01 (H)