Agilent Technologies TV 301-P Bedienungshandbuch Seite 44

SOFT START: this input is used to provide a "soft start"
to the pump; in this condition the ramp-up time could be
up to 45 min.
SPEED SETTING: PWM input signal to set the pump
speed. The PWM signal characteristics must be the
following:
•
frequency: 100 Hz +/-20%
•
ampitude: 24 V max
•
duty cycle range: from 25% to 75%
•
corresponding to a pump speed from 187 Hz to 963
Hz (see the following diagram).
PROGRAMMABLE ANALOG SIGNAL: this output sig-
nal is a voltage (from 0 to 10 Vdc) proportional to a ref-
erence quantity (frequency or power) set by the user.
The default setting is the frequency (see the following
example diagram).
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.
For example:
- reference quantity: frequency
- threshold: 500 Hz
- hysteresis: 1%
- activation type: "high level"
The set point output stays at 0 Vdc until the frequency
becomes higher than 505 Hz (that is 500 Hz + 1% of
500 Hz), then the output goes at 24 Vdc and stays at 24
Vdc until the frequency becomes lower than 495 Hz
(that is 500 Hz – 1% of 500 Hz).
It is possible to delay the set point checking for a pro-
grammable delay time.
The PROGRAMMABLE SET POINT signal has the fol-
lowing default settings:
- reference quantity: frequency
- thereshold: 867 Hz
- hysteresis: 2%
- activation type: high level
- delay time: 0 second
The Navigator Software (optional) allows the operator to
set all the programmable feature.
When no external input-output device is available this
connector must be closed with the supplied mating con-
nector that short-circuits the START and INTERLOCK
inputs with the GROUND input (see the following figure).
38
TECHNICAL INFORMATION
NOTE
87-901-001-01 (A)