Watson-Marlow 720UN and 720SN User Manual
61
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. The pump is configured to operate without modification anywhere in this
range. Any of the 0V terminals - though preferably the 0V terminal associated
with the desired input - is connected to the control device’s 0V to make the
circuit. Low is equivalent to 0V. High is equivalent to 5V
→
24V.
Switch
A remote switch may be connected between the input and any positive voltage
supply from the pump - though preferably the associated supply terminal. Do
not use the 10V supply from the Rem-pot connector, however.
19.6 Run/stop input
Remote run/stop: connect a remote switch between the
i/p
terminal and the
+5V
terminal of the Run/stop i/p connector
(J4). Alternatively a logic input may be applied to the
i/p
ter-
minal, ground to the
0V
terminal. 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 16.5
Remote stop
in
the Setup menu.
19.7 Direction input
To enable remote direction con-
trol and disable the
DIREC-
TION (SHIFT, 1)
key on the
keypad, link the terminals of
the Direction enable link con-
nector (J6).
Important: Apply
no voltage whatever to the
Direction enable link.
Con-
nect a remote switch between
the
+5V
terminal and the
i/p
terminal of the Direction i/p
connector (J2). Open switch for
clockwise rotation, closed switch for counter-clockwise rotation. Alternatively a logic
signal may be applied to the
i/p
terminal and the
0V
terminal of the Direction i/p con-
nector (J2). Low input for clockwise rotation, high input for counter-clockwise rota-
tion. With no connection the pump defaults to clockwise rotation.
