Timer - Grundfos DME 12 Montage- Und Betriebsanleitung

4.12 Timer

The pump is dosing the set quantity in batches at the
maximum capacity or the set maximum capacity, see
section 4.15.
The time until the first dosing "NX" and the following
sequences "IN" can be set in minutes, hours and
days. The maximum time limit is 9 days, 23 hours
and 59 minutes (9:23:59). The lowest acceptable
value is 1 minute. The internal timer continues even
if the pump is stopped by means of the on/off button,
empty tank or stop signal, see fig. 11.
During operation, "NX" will always count down from
"IN" to zero. In this way, the remaining time until the
next batch can always be read.
"IN" must be higher than the time required to perform
one batch. If "IN" is lower, the next batch will be ig-
nored.
In case of supply failure, the set quantity to be
dosed, the "IN" time and the remaining "NX" time are
stored. When the supply is reconnected, the pump
will start up with the "NX" time at the time of the sup-
ply failure. In this way, the timer cycle will continue,
but it has been delayed by the duration of the supply
failure.
Fig. 11
Quantity per batch
NX
IN
Setting range:
DME 2: 0.23 ml/batch - 5 l/batch
DME 8: 0.69 ml/batch - 15 l/batch
DME 12: 1.11 ml/batch - 24 l/batch
DME 19: 2.04 ml/batch - 37 l/batch
DME 48: 5.3 ml/batch - 96 l/batch
Only values corresponding to complete dosing
strokes (according to the calibration factor) can be
selected.
Example: If the calibration factor is 23.3 (= 0.233 ml/
stroke), the minimum settable value in timer or batch
mode will be 0.233 ml -> the next will be 0.466 ml ->
the next will be 0.699 ml, etc.
These steps will continue up to a value correspond-
ing to 100 dosing strokes. Above this value, the set-
ting range has standard steps as in other operating
modes.
If the calibration factor is changed after setting of
timer or batch mode, the pump will automatically re-
calculate a new amount of dosing strokes per batch
and change the display value to the nearest possible
value compared to the first one set.
16
Fig. 12
Set quantity
per batch
Set IN value
in minutes
Set IN value
in hours
Set IN value
in days
Set NX value
in minutes
Set NX value
in hours
Set NX value
in days