Watson-Marlow 520Du - Manual (Page 66)

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 66
22.5 Run / stop input
Remote run / stop: connect a remote switch between pins 7 and 19 of the lower D-
connector. Alternatively a logic input may be applied to pin 7 of the lower D-connec-
tor, ground to pin 18. High input stops the pump, low input runs the pump. With no
connection or with the switch open, the pump will default to running. To change or
set the sense of the run / stop input, see 18.11 Remote stop in the Setup menu.
Important: general instructions for remote control inputs
All remote control inputs can be wired in two ways:
Logic
A logic voltage between 5V TTL and 24V industrial logic may be wired to the
input pin. The pump is configured to operate without modification anywhere
in this range. Any of the 0V pins is connected to the control device’s 0V to
make the circuit. One 0V pin is identified in the wiring diagram, but any may
be used. Low is equivalent to 0V. High is equivalent to 5V
24V.
Switch
A remote switch may be connected between the input pin and any positive
voltage supply from the pump. One 5V supply pin is identified in the wiring
diagram but there are several which will do, either 5V or other positive volt-
age. However, do not use pin 21 on the lower D-connector or pin 20 on the
upper D-connector.