2Specifications are subject to change without notice (01.09.06)
Mode of Operation
DLA71 is made for pumping
systems where2or 3 pumps
are in parallel. It lets the
pumps work alternatively,
allowing morepumps to
work togheter in case of
need.
Example 1
(emptying a basin, 2-pump
system)
As soon as the liquid reach-
es switch S1 one pump
starts. As soon as S1
switches back the pump
stops. When switch S1 is
activated again the other
pump starts allowing uni-
form wear and tear of all the
pumps. If switch S2 is acti-
vated both pumps start (2
pumps running at the same
time). When S2 switches
back the pump running
since most time stops.
Example 2
(emptying a basin, 2-pump
system, differential mode)
In this case the pumps are
separately started and
stopped by the two pairs of
switches S1, S2 and S3, S4.
Appropriate positioning
allows the pumps to work
together in case of need.
Note (2-pump system)
If the system is continuously
working with only one pump,
after working for 6 hours,
DLA71 stops the pump and
the second one automatical-
ly starts.
This rotation is repeated
every 6 hours of single and
continuative work of a
pump.
Example 3
(emptying a basin, 3-pump
system, normal mode)
The system works exactly as
described in example 1
except that if switch S3 is
reached three pumps work
at the same time. When they
switch back the pumps are
turned off in sequence start-
ing from the one running
longer.
Example 4
(emptying a basin, 3-pump
system, full mode)
As soon as the liquid reach-
es switch S1 one pump
starts. When it drops below
switch S4 it stops. If switch
S1 is triggered again another
pump starts. If switch S2 is
activated a second pump
starts (rescue function). If
switch S3 is activated all the
pumps operate. The only
switch to stop all the pumps
active at a certain time is S4.
Note (3-pump system)
If the system is continuously
working with only one pump,
after working for 6 hours,
DLA71 stops the pump and
the second one automatical-
ly starts. If also the second
pump works continuously
alone for 6 hours, it is
stopped and the third pump
is then started.
If a couple of pumps is con-
tinuously working for 6
hours, the one running for
more time stops and the free
one starts.
This rotation is repeated
every 6 hours of continuative
work of a pump or a couple
of pumps.
Note (2 and 3-pump sys-
tems)
In case the task is to fill a
basin, all the switches are
reversed in the basin itself.
DLA71
Indication for
Power supply ON LED, green, steady
One Pump ON as above, flashing 1 Hz
Two Pumps ON as above, flashing 2 Hz
Three Pumps ON(DLA71...3P) as above, flashing 3 Hz
Note: if more than one pump
isactive, the indication refers
to the pump started last.
Environment (EN 60529)
Degree of protection IP 20
Pollution degree 3
Operating temperature -20 to 60°C, R.H. < 95%
Storage temperature -30 to 80°C, R.H. < 95%
Housing
Dimensions 35.5 x 81 x 67.2 mm
Material PA 66
Weight Approx. 135 g
Screw terminals
Tightening torque Max. 0.5 Nm
acc. to IEC 60947
Approvals UL, CSA
CE Marking Yes
EMC
Electromagnetic Compatibillity
Immunity According to EN 61000-6-2
Emission According to EN 61000-6-3
General Specifications
Power supply Overvoltage cat. III
Rated operational voltage (IEC 60664, IEC 60038)
through terminals:
A1, A2 or A3, A2
B48: 24/48 VAC ± 15%
45to 65 Hz, insulated
B23: 115/230 VAC ± 15%
45 to 65 Hz, insulated
Dielectric voltage
Supply to input 4 kV (1.2/50 µs)
Supply to output 4 kV (1.2/50 µs)
Input to output 4kV (1.2/50 µs)
Rated operational power
AC 3VA
Supply Specifications
Reaction time
Closing input < 100 ms
Opening input < 100 ms
Minimum delay to activate
the rescue pumps 10 s
Continous working time to
activate the rotation pumps 6 h ± 10%
General Specifications