Watson-Marlow Qdos30 Universal - Manual (Page 49)

Watson-Marlow qdos30 Universal and Universal+ Pump User Manual 49
17.1 Remote fluid recovery
It is possible to run the pump in reverse and recover fluid automatically in the analog
4-20mA mode. To achieve this, it is necessary to enable remote fluid recovery
functionality. To enable this position the selection bar over fluid recovery in the mode
menu and press the SETTINGS function key.
Select ENABLE to turn this functionality on. The reverse process can be used to
switch the function off.
When this function is enabled, the pump operation can be reversed in analog 4-20mA
mode by applying minimum 5V to maximum 24V to pin 5 of the pump input. The
pump will operate at a reversed set speed proportional to the 4-20mA input applied
to pin 3.
This operating method allows for fluid recovery from your delivery line. It should not
be used for bulk fluid transfer.
Once enabled remote fluid recovery should be operated in the following sequence
a) Send a remote stop signal (apply 5 - 24 volts to input pin 1)
b) Apply 5 - 24 volt to pin 5 of the pump input
c) Remove the remote stop signal
d) Apply 4 - 20mA to the analogue input. This will cause the pump to run in reverse
at a speed proportional to the analogue signal.
e) Apply remote stop signal when enough fluid has been recovered
f) Remove the voltage at pin 5 of the pump inputs
g) Remove the remote stop signal when you are ready to run forwards again