2

Specifications are subject to change without notice (03.06.10)

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.

First pump activated after

Random

power up

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

PA66 or Noryl

Weight

Approx. 135 g

Screw terminals

Tightening torque

Max. 0.5 Nm

acc. to IEC 60947

Product standard

EN 60255-6

Approvals

UL, CSA

CE Marking

L.V. Directive 2006/95/EC

EMC Directive 2004/108/EC

EMC

Immunity

According to EN 60255-26

According to EN 61000-6-2

Emissions

According to EN 60255-26

According to EN 61000-6-3

General Specifications (cont.)

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