Watson-Marlow 620U - Manual (Page 70)

Watson-Marlow 620UN, 620U, 620SN, 620S User Manual 70
21.5 Direction input
To enable remote direction control and disable the DIRECTION (SHIFT, 1) key on
the keypad, link pins 6 and 18 of the lower D-connector. Connect a remote switch
between pins 5 and 19 of the lower D-connector. Open switch for clockwise rotation,
closed switch for counter-clockwise rotation. Alternatively a logic signal may be
applied to pin 5 of the lower D-connector, ground to pin 17. Low input for clockwise
rotation, high input for counter-clockwise rotation. With no connection the pump
defaults to clockwise rotation.
21.6 Auto / manual toggle input
Connect a remote switch between pins 3 and 18 of the upper D-connector. Closed
switch for automatic control; open switch for manual control. Alternatively a logic
input may be applied to pin 3 of the upper D-connector, ground to pin 16. High input
for automatic control; low input for manual control.