15
Fig. 8
Relationship between dosed quantity in
% and input value in mA
Fig. 9
Analog mode
If 4-20 mA or 20-4 mA is selected and the signal falls
below 2 mA, the pump will indicate a fault. This situa-
tion occurs if the connection is interrupted, for
instance if the wire is damaged.
Change the analog mode as illustrated in fig. 10:
Fig. 10
Changing the analog mode
4.12 Timer
The pump is dosing the set quantity in batches at the
maximum capacity or the set maximum capacity, see
section
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
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 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
Relation between timer variable and
dosing process
TM
02
44
98
1
1
0
2
0
4
8
12
16
20
0
20
40
60
80
100
[%]
[mA]
0-20 mA
4-20 mA
Value
according to
analog signal
Use the buttons
for navigation
TM
01
8
942
09
00
NX
IN
Quantity per batch
Grundfos.bk Page 15 Wednesday, May 21, 2008 11:21 AM
