Watson-Marlow 120U/D1 - Manual (Page 25)

Watson-Marlow 120U IP31 pumps: operating instructions 11
2.6.6 How to get into
auto speed operation
Check that the pump is ready to run before
remote/automatic operation. Signals may start the
pump without warning.
Press the AUTO key to select automatic
operation. A beep sounds and the LED beside
the AUTO key illuminates to indicate that the
pump is under automatic speed control.
The pump responds to the analogue signal as
soon as this is done. Auto-start is automatically
switched on. The only keys active are STOP,
AUTO and DIRECTION.
If remote direction input is active and the
direction-enable link is applied, the
DIRECTION key is disabled. If keypad lock is
set, only STOP and START are active. STOP
stops the pump and switches it to manual
control (or, if the pump was put into auto mode
by remote switching, to the auto-stop
state—see Alternatively, below). START
pressed for more than 1 second toggles the
keypad lock on or off.
The pump displays the speed at which the
pump will rotate after receiving a high signal
(20mA or 10V).
Alternatively ...
A remote signal can select auto or manual control,
overriding the keypad AUTO key setting.
Fit a switch or link between pins 7 and 13.
OR:
Apply a TTL logic signal to pin 7, ground to pin 12.