Power Off; Remote On/Off; Memory Function - Grundfos DDI 222 Montage- Und Betriebsanleitung

9.2.4 Diaphragm leakage sensor (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
1.20
MBS
Fig. 20 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
1.20
Stop
ERROR MBS
Fig. 21 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.
A cable break of the pressure switch is also indicated
as a diaphragm leakage signal (MBS error). After
Note
acknowledging the MBS error, the pump continues to
operate without error indication!
9.2.5 Blocking safety
If the pump has existing strokes to process, a check is carried out
to determine 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.
Run
Stop
ERROR
ERROR
Fig. 22 Display: motor monitoring
• The pump is stopped.
• The red LED flashes.
For possible errors and their correction,
see section 11. Fault finding chart
Once the error has been corrected,
• press the "Start/Stop" button to acknowledge the error.
22
l/h
l/h
Analog
Analog
0
0
1/min
1/min
bar
bar
.

9.2.6 Power off

If the power consumption of the drive motor is too high, e.g. due
to excess counter-pressure in the dosing system, this is detected
and indicated by the power monitoring function.
• The error signal relay switches on.
• "1/min", "bar" and "ERROR" flash in the display.
• The pump is stopped. Every 10 minutes, an attempt is made to
automatically restart the pump.
• The LED flashes red/green.
Run
ERROR
Fig. 23 Display: power off
For possible errors and their correction,
see section 11. Fault finding chart
Once the error has been corrected,
• the pump restarts automatically, or
• press the "Start/Stop" button to acknowledge the error.

9.2.7 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 manually (press the
"Start/Stop" button) and run in continuous operation (press
and hold down the "Start/Stop" button).
• "Stop" lights up in the display.
• The yellow LED lights up.
• When 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.

9.2.8 Memory function

Contact signals, which cannot be processed immediately, can be
stored and subsequently made available to the pump for
processing. A maximum of 65,000 contact signals can be stored.
• Without memory: If the pump is running when a contact
signal is received, the signal is ignored. The pump performs
the current dosing, then it is again ready to receive new
contact signals, i.e. it rejects excess contacts.
• With memory: If the pump is running when a contact signal is
received, the signal is stored in the memory. First, the pump
performs the current dosing, then it processes the contact
signals from the memory.
The contents of the memory are deleted:
• by switching off the power supply
• by switching the operating mode.
The contents of the memory are not deleted:
• by actuating the remote on/off contact
• by pressing the "Start/Stop" button
• by continuous operation.
The memory function can be enabled and disabled in
Note
the second function level.
Analog
0
1/min
bar
.