Diaphragm Leakage Detection (Mbs); Remote On/Off; Hall Sensor / Motor Monitoring - Grundfos DMX 221 Manual Del Usuario

8.4.4 Diaphragm leakage detection (MBS)

As an option, the pump can be equipped with a sensor for
diaphragm leakage detection.
The electronics automatically detects whether a sensor is
connected. The following appears in the display.
Manual
120
MBS
Fig. 13 Display: MBS sensor is connected
When a diaphragm leakage is detected by the sensor,
• The pump is switched off.
• The error signal relay switches on.
• The LED flashes red.
• "MBS" and "ERROR" flash in the display.
Manual
120
Stop
ERROR MBS
Fig. 14 Display: diaphragm leakage detected
Once the error has been corrected (the contact is no longer
closed),
• Press the "Start/Stop" button to acknowledge the error.
• The pump starts running again (if it was running before).
• The error signal relay switches off.
• The pump returns to the state it was in before the error
occurred.

8.4.5 Hall sensor / motor monitoring

If the pump has existing strokes to process, the Hall sensor
checks whether the drive is turning. If the drive motor is blocked,
e.g. due to excess counter pressure in the dosing system, this is
detected and indicated by the integrated motor monitoring
function.
• The error signal relay switches on.
• "1/min", "bar" and "ERROR" flash in the display.
• The motor is not switched off.
Run
ERROR
Fig. 15 Display: motor monitoring
For possible errors and their correction, see the fault finding chart
in the installation and operating instructions for the pump.
• When the pressure has dropped to a certain level, the pump
will restart automatically.
Once the error has been corrected,
• Press the "Start/Stop" button to acknowledge the error.
The motor monitoring function does not provide
protection for the motor as power is still supplied to
Caution
the motor. Therefore, the motor should be protected
by a motor protector.
1/min
1/min
Analog
0
1/min
bar

8.4.6 Remote on/off

The pump can be switched off remotely
(e.g. from a control room).
• If switched off remotely, the pump does not respond to any
input signals or to operator input.
Exception: The pump can still be stopped and deaerated
manually.
– "Stop" lights up in the display.
– The yellow LED lights up.
If the pump was switched off remotely, the colour of the LED
may vary for the different pump modes.
• When it is switched on remotely, the pump returns to the state
it was in before it was switched off. If, for example, the pump
was previously in "Stop" mode, it returns to this mode once it
is switched on.
8.4.7 Dosing controller
As an option, a dosing controller can be connected to the pump.
The dosing controller monitors the dosing process and emits a
pulse for each dosing stroke.
• The dosing controller is enabled and disabled in the second
function level. See section 8.7 Second function
• During start-up or after 5 seconds of downtime, the electronics
automatically detects whether a dosing controller is
connected. The following appears in the display.
Manual
flow
Fig. 16 Display: dosing controller is connected
Start-up operation
After starting the pump, 60 strokes are performed even if no
signal is received from the dosing controller.
If the dosing controller emits a pulse, "flow" is briefly turned off in
the display.
The start-up operation is triggered as follows:
• By pressing the "Start/Stop" button
• By switching the operating mode
• The lower stop point not being reached during current signal
control
• By actuating the remote on/off contact
• By switching on the power supply.
The start-up operation cannot be started in "contact
Note
signal control" mode.
level.
120
1/min
15