Watson-Marlow 520Du - Manual (Page 26)

Watson-Marlow 520DuN IP66/NEMA 4X User Manual 26
14.2 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.
14.3 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 DIRECTION keys while switching on the mains power
switch at the rear of the pump.
14.4 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 overriding 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.
If you invert the operation of the remote run / stop switch to operate as open=stop,
you must connect pin 7 to 19, lower D-connector, to be able to start the pump from
the keypad.
If STOP is pressed the remote run / stop switch will have no effect.
You cannot invert the remote direction signal.