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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.
SPEED SETTING: PWM input signal to set the pump speed. The
PWM signal characteristics must be the following:
frequency: 100 Hz +/-20 %
amplitude: 24 V max
duty cycle range: from 25 % to 75 %
corresponding to an output frequency from 750 Hz to 1010 Hz
(see the following diagram):
Figure 17
If any signal isn't applied (no connection) the pump speed is set to
"High Speed" (1010 Hz max and settable by window "120").
TV 401/301/21 NSF User Manual / 87-900-995-01 (C)
Technical Information
Interconnections
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