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Watson-Marlow 620DuN and 620Du User Manual 23
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.
14.5 Keypad beep
The pump keypad can operate silently or indicate a positive key-press with a beep
sound.
To toggle the sound on and off, stop the pump. Turn off the mains power switch
at the rear of the pump.
Depress the UP and 1 (DIRECTION) keys while switching on the mains power
switch at the rear of the pump.
See 18.21 Beep.
14.6 Manual operation and remote digital
inputs and outputs
The remote run/stop, direction and leak-detected inputs are operational.
The remote status outputs are all fully functional.
The STOP key acts as an emergency stop. The run/stop input will not start the pump
in manual mode, but once the START key has been pressed, the remote run/stop
input will stop and start the pump according to its operational state.
(620DuN) If you invert the operation of the remote run/stop switch to operate as
open=stop, you must connect the +5V terminal to the i/p terminal on the Run/stop
input connector (J4), to be able to start the pump from the keypad. See 22.7
Run/stop input.
(620Du) If you invert the operation of the remote run/stop switch to operate as
open=stop, you must connect pin 7 to pin 19, lower D-connector, to be able to start
the pump from the keypad. See 22.7 Run/stop input.
If STOP is pressed the remote run/stop switch will have no effect.
You cannot invert the polarity of the remote direction signal.