Grundfos SMART Digital DDA, Installation And Operating Instructions Manual

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Timer, cycle (relay 2)
For the ’Relay 2 > Timer cycle’ function, set the
following parameters:
• Dosing time (t
1
)
• Start delay (t
2
)
• Cycle time (t
3
)
Fig. 37 Diagram
Timer, week (relay 2)
This function saves up to 16 relay on-times for a
week. The following settings can be made for each
relay switching operation in the
’Relay 2 >
Timer Week’ menu:
• Procedure (No.)
• On-time (duration)
• Start time
• Weekdays.
6.16.2 External stop
The pump can be stopped via an external
pulse, e. g. from a control room. When activating the
external stop pulse, the pump switches from the
operational state ’Running’ into the operational state
’Standby’. The corresponding symbol appears in the
Signal/error display (see section
6.2.2 Operating
states ).
The contact type is factory-set to closed contact
(=>NO). In the
’Setup > Inputs/outputs > External
stop’ menu, the setting can be changed to open
contact (=>NC).
6.16.3 Empty and low-level signals
In order to monitor the filling level in the
tank, a dual-level sensor can be connected to the
pump. The pump responds to the signals as follows:
Both signal inputs are allocated to the closed contact
(=>NO) in the factory. They can be re-allocated in
the
’Setup > Inputs/outputs’ menu to open contact
(=>NC).
6.17 Basic settings
All settings can be reset to the settings default upon
delivery in the
’Setup > Basic settings’ menu.
Selecting ’Save customer settings’ saves the current
configuration to the memory. This can then be
activated using
’Load customer settings’ .
The memory always contains the previously saved
configuration. Older memory data is overwritten.
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Caution
Frequent disengagement from the
mains voltage, e. g. via a relay, can
result in damage to the pump
electronics and to the breakdown of the
pump. The dosing accuracy is also
reduced as a result of internal start
procedures.
Do not control the pump via the mains
voltage for dosing purposes!
Only use the ’External stop’ function to
start and stop the pump!
t
2
t
3
t
1
t
1
Sensor signal Pump status
Low level
• Display is yellow
•
flashes
• Pump continues
running
Empty
• Display is red
•
flashes
• Pump stops