2
Specifications are subject to change without notice (01.09.06)
Mode of Operation
DLA71 is made for pumping
systems where 2 or 3 pumps
are in parallel. It lets the
pumps
work
alternatively,
allowing
more
pumps
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
is active, 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%
45 to 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
4 kV (1.2/50 µs)
Rated operational power
AC
3 VA
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
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