Watson-Marlow 120U/D1 - Manual (Page 20)

Watson-Marlow 120U IP31 pumps: operating instructions 6
2.4.12 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.
To lock the keypad while the pump is running:
Hold down the START key for more than one
second. A beep sounds, the LED beside the
padlock symbol flashes briefly then illuminates
and the keypad is locked. Only the START and
STOP keys function. If another key is pressed
while the keypad is locked and the pump is
running, a message is briefly displayed: Hold
Strt. This tells the user to press and hold the
START key for more than one second to unlock
the keypad and make the required key
available.
To lock the keypad while the pump is stopped:
Hold down the STOP key for more than one
second. A beep sounds, the LED beside the
padlock symbol flashes briefly then illuminates
and the keypad is locked. Only the START and
STOP keys function. If another key is pressed
while the keypad is locked and the pump is
stopped, a message is briefly displayed: Hold
Stop. This tells the user to press and hold the
STOP key for more than one second to unlock
the keypad and make the required key
available.
To unlock the keypad while the pump is running:
Hold down the START key for more than one
second. A beep sounds, the LED beside the
padlock symbol flashes briefly then goes out
and the keypad is unlocked.
To unlock the keypad while the pump is stopped:
Hold down the STOP key for more than one
second. A beep sounds, the LED beside the
padlock symbol flashes briefly then goes out
and the keypad is unlocked.
Note: In auto mode only, START pressed for
more than 1 second toggles the keypad lock on
or off.
2.4.13 Defaults
To return the pump to its default settings, press
and hold DIRECTION on power up. See 2.3
Switching the pump on.
2.4.14 Set maximum
allowed speed
While the pump is stopped, press AUTO and UP
together to put the pump into Setup mode. The
display shows the current maximum allowed speed,
and flashes to indicate that the pump is in Setup
mode. Use the UP and DOWN keys to select a new
maximum allowed speed. Press AUTO to confirm
the new maximum allowed speed. Press STOP to
escape from the the change sequence and revert to
the previous maximum allowed speed. The
minimum maximum speed is 2 rpm.