Timer - Grundfos DME Serie Instrucciones De Instalación Y Funcionamiento

6.13 Timer

The pump is dosing the set quantity in batches at the
maximum capacity or the set maximum capacity, see
section 6.16 Capacity limitation.
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. 12.
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
ignored.
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
supply failure. In this way, the timer cycle will
continue, but it has been delayed by the duration of
the supply failure.
Quantity per batch
NX
IN
Fig. 12
Setting range, adjustable volume per batch:
DME 60: 0.0017 to 31.7 gal (6.25 ml - 120 l)
DME 150: 0.0041 to 79.3 gal (15.6 ml - 300 l)
DME 375: 0.01 to 198.1 gal (39.1 ml - 750 l)
DME 940: 0.025 to 496.7 gal (97.9 ml - 1880 l)
Only values corresponding to complete dosing
strokes (according to the calibration factor) can be
selected. The minimum setting depends on the
calibration factor. The minimum setting shown above
corresponds to the default calibration value.
Example:
If the calibration factor is 625 (= 6.25 ml/stroke), the
minimum settable value in timer or batch mode will
be 6.25 ml (= 1 stroke) -> the next will be 12.5 ml
(= 2 strokes), etc.
These steps will continue up to a value
corresponding to 100 dosing strokes. Above this
value, the setting range has standard steps as in
other operating modes.
If the calibration factor is changed after the setting of
timer or batch mode, the pump will automatically
recalculate a new number of dosing strokes per
batch and change the display value to the nearest
possible value compared to the first one set.
Set quantity
per batch
Set IN value
in days
Set IN value
in hours
Set IN value
in minutes
Set NX value
in days
Set NX value
in hours
Set NX value
in minutes
Fig. 13
21