Signal Description - Agilent Technologies TwisTorr 305-IC Mode D'emploi

8 Technical Information

Signal Description

Signal Description

Start/Stop: input signal to start or stop the pump. With the supplied cover connector
the START/STOP (+) signal is connected to the +24 Vdc pin and the START/STOP (-)
signal to the GROUND pin: in this condition the pump automatically starts as soon as
the controller recognises the input supply ("Plug & Pump").
Interlock: input signal to control the pump rotation. With the supplied cover connector
the interlock (+) signal is connected to the +24 Vdc pin and the interlock (-) signal to
the GROUND pin.
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:
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(1) The Speed Setting input is able to work also with a PWM signal having an
NOTE
amplitude equal to 13VDC or to 33VDC. In these conditions, the accuracy of
the speed setting is affected by a deviation value <1%.
(2) Due to the fact that the rotational target frequency value is adjustable via
serial command (refer to the "Windows meanings"), the input
condition in which the PWM duty cycle >75% will ensure a rotational
frequency equal to the one that has been set via the serial command;
the default factory setting for the rotational target frequency is 1010Hz.
268/302
frequency: 100 Hz +/-20%
amplitude: +24VDC ± 10%
duty cycle range: from 25% to 75% (t
frequency varying linearly from 700 Hz to the target frequency value set
via serial command (default factory setting 1010 Hz). With duty cycle <25%
rotational frequency = 700 Hz, duty cycle >75% rotational frequency = target
frequency value (deviation value <0.25%).
/T) corresponding to a rotational
off
TwisTorr 305-IC User Manual / 87-901-058-01