Varian TV 301 Manual De Instrucciones página 36

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 out-
put signal is a voltage (from 0 to 10 Vdc) propor-
tional to a reference quantity (frequency or power)
set by the user. The default setting is the fre-
quency (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 collec-
tor 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 fre-
quency or the current drawn, it is possible to set
the hysteresis (in % of the threshold value) to
avoid
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bouncing.
31
TECHNICAL INFORMATION
For example:
- reference quantity: frequency
- threshold: 500 Hz
- hysteresis: 1%
- activation type: "high level"
The set point output stays at 0 Vdc until the fre-
quency 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 be-
comes lower than 495 Hz (that is 500 Hz – 1% of
500 Hz).
It is possible to delay the set point checking for a
programmable delay time.
The PROGRAMMABLE SET POINT signal has
the following default settings:
- reference quantity: frequency
- thereshold: 867 Hz
- hysteresis: 2%
- activation type: high level
- delay time: 0 second
NOTE
The Navigator Software (optional) allows the op-
erator to set all the programmable feature.
When no external input-output device is available
this connector must be closed with the supplied
mating connector that short-circuits the START
and INTERLOCK inputs with the GROUND input
(see the following figure).
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