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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 272 Hz
to 714 Hz (see the following diagram).
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 150 min.
PROGRAMMABLE ANALOG SIGNAL: this output
signal is a voltage (from 0 to 10 Vdc) proportional
to a reference quantity (frequency or power) set by
the user. The default setting is the frequency (see
the following example diagrams).
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 frequency
or the current drawn, it is possible to set the hys-
teresis (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 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: 643 Hz
- hysteresis: 2%
- activation type: high level
- delay time: 0 second
The Navigator Software (optional) allows the op-
erator to set all the programmable feature.
32
TECHNICAL INFORMATION
NOTE
87-900-934-01(B)
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