Watson-Marlow 720DuN User Manual 26
14.2 Speed
To change the running speed:
Use the UP and DOWN keys to change the pump’s running speed within limits
of 0.1 rpm or other minimum allowed speed and the maximum allowed speed.
Note: You can reduce the pump speed from 0.1 rpm or other minimum allowed
speed to 0 rpm by a further press on the DOWN key. The pump is still in the
running state and the rotation symbol will continue to move. Press the UP key
to return the pump to the minimum speed.
Note: The maximum allowed speed of the drive defaults to 300 rpm. It is possible
to set this limit at any speed up to 360 rpm. It is also possible to set a minimum
speed. See 18.13 Set maximum allowed speed and 18.14 Set minimum allowed
speed.
14.3 Direction
To toggle the pump’s rotation sense:
Press DIRECTION (SHIFT, 1) to toggle the pump between clockwise and
counter-clockwise rotation.
Note: Direction control is available subject to access not being limited by security
code. See 18.22 Security code.
14.4 Keypad lock
The keypad can be locked to prevent changes to pump speed or other settings, and
make it possible only to start or stop the pump. The padlock symbol shows on the
display.
While the pump is running, hold down the START key for two seconds. The
padlock symbol shows and only the START and STOP keys function.
The keypad may also be locked while the pump is stopped. Hold down the
STOP key for two seconds. The padlock symbol shows and only the START
and STOP keys function.
To unlock the keypad while the pump is running hold down the START key for
two seconds. The padlock symbol is removed. If the pump is stopped hold
down the STOP key until the padlock symbol is removed.
Note: Keypad lock is available subject to access not being limited by security
code. See 18.22 Security code.
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