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Technical Information
If any signal isn't applied (no connection) the driving frequency is set to "Maximum
ROTATIONAL frequency" (the default value is 650 Hz; it is settable via serial line by
means of window 121: see the serial command table).
If a continuous signal is applied (for example pin 5 connected to pin 9 and pin 6
connected to pin 15 t
/T = 0%) the driving frequency is set to "Low Speed"
off
(the default value is 680 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 communication with
window 1, and the low speed value can be adjusted via window 117.
Both low speed value (win.117) and high-speed value (win.120) are limited between
440 Hz (value that can't be set by the user) and "Maximum excitation frequency"
(win.121, 825 Hz default).
SOFT START: input signal (opt isolated) to activate the Soft Start function. This
function must be activated (pin 7 shorted with pin 9 and pin 8 shorted with pin 15)
if the pump remains unused for a protracted stop, and de-activated for the next run-
up. See the paragraph "SOFT START" for a more detailed description.
PROGRAMMABLE ANALOG SIGNAL: this signal is an output voltage (from 0
to 10 Vdc, max load 1.5 mA) proportional to a reference quantity (frequency, power,
pump temperature) chosen by the user (by means of the front panel commands or
through serial command – window 111). The default setting is frequency (see the
following example diagrams).
Figure 35
Agilent TwisTorr Medium-TMP Rack Controller User Manual
157
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