Monitoring Relays
Pump alternating
Type DLA71
• Pump alternating relay for 2 or 3 pumps
• Output: 2 x 5 A SPST relay or 3 x 5 A SPST
• For mounting on DIN-rail in accordance with
DIN/EN 50 022
• 35.5 mm DIN-rail housing
• LED indication for relay and power supply ON
• Galvanically separated power supply
• Built-in delay for the second or third pump in case of
simultaneous activation is required
• Built-in function for automatic rotation of the pumps
Product Description
DLA71 is relay made to
alternate 2 or 3 pumps in a
multiple pump system. In
case of need (i.e.: overflow)
the second, or even the third
pump can be activated
together with the first one.
In case more than one pump
is required to start at the
same time, the pumps start
10 s after the previous to
avoid big inrush current.
The LED indicates the state
of the alarm and the output
relay.
35.5 mm wide housing suit-
able both for back and front
panel mounting.
Ordering Key
Housing
Function
Type
Item number
Output
Power supply
Number of pumps
DLA 71 T B23 3P
Type Selection
Mounting
DIN-rail
DIN-rail
Output
2 x SPST
3 x SPST
Function
For two pumps
For three pumps
Supply: 24/48 VAC
DLA 71 D B48 2P
DLA 71 T B48 3P
Supply: 115/230 VAC
DLA 71 D B23 2P
DLA 71 T B23 3P
Input Specifications
Contact input
DLA71...2P (normal mode)
ON/OFF 1 pump
ON/OFF 2 pumps
DLA71...2P (differential mode)
first pump starts
first pump stops
second pump start
second pump stop
DLA71...3P (normal mode)
ON/OFF 1 pump
ON/OFF 2 pumps
ON/OFF 3 pumps
DLA71...3P (full mode)
ON 1 pump
ON 2 pumps
ON 3 pumps
OFF all pumps
Disabled
Enabled
Voltage
Current
Terminals
C, S1
C, S2
C, S1
C, S3
C, S2
C, S4
C, S1
C, S2
C, S3
C, S1
C, S2
C, S3
C, S4
> 10 kΩ
< 1 kΩ
< 25 V
< 2 mA
Output Specifications
DLA71...2P
DLA71...3P
Rated insulation voltage
Contact ratings
(AgSnO
2
)
AC 1
Resistive loads
DC 12
Small inductive loads AC 15
DC 13
Mechanical life
Electrical life
Output
2 x SPST NO relay
3 x SPST NO relay
250 VAC
µ
5 A @ 250 VAC
5 A @ 24 VDC
1.5 A @ 250 VAC
1.5 A @ 24 VDC
≥
30 x 10
6
operations
≥
10
5
operations
(at 5 A, 250 V, cos
ϕ
= 1)
≤
7200 operations/h
Operating frequency
Dielectric strength
Dielectric voltage
2 kVAC (rms)
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Specifications are subject to change without notice (01.09.06)
1
DLA71
Supply Specifications
Power supply
Rated operational voltage
through terminals:
A1, A2 or A3, A2
B48:
B23:
Dielectric voltage
Supply to input
Supply to output
Input to output
Rated operational power
AC
Overvoltage cat. III
(IEC 60664, IEC 60038)
24/48 VAC ± 15%
45 to 65 Hz, insulated
115/230 VAC ± 15%
45 to 65 Hz, insulated
4 kV (1.2/50 µs)
4 kV (1.2/50 µs)
4 kV (1.2/50 µs)
3 VA
General Specifications
Indication for
Power supply ON
One Pump ON
Two Pumps ON
Three Pumps ON(DLA71...3P)
LED, green, steady
as above, flashing 1 Hz
as above, flashing 2 Hz
as above, flashing 3 Hz
Note: if more than one pump
is active, the indication refers
to the pump started last.
(EN 60529)
IP 20
3
-20 to 60°C, R.H. < 95%
-30 to 80°C, R.H. < 95%
35.5 x 81 x 67.2 mm
PA 66
Approx. 135 g
Max. 0.5 Nm
acc. to IEC 60947
UL, CSA
Yes
Electromagnetic Compatibillity
According to EN 61000-6-2
According to EN 61000-6-3
General Specifications
Reaction time
Closing input
Opening input
Minimum delay to activate
the rescue pumps
Continous working time to
activate the rotation pumps
< 100 ms
< 100 ms
10 s
6 h ± 10%
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Housing
Dimensions
Material
Weight
Screw terminals
Tightening torque
Approvals
CE Marking
EMC
Immunity
Emission
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
and
separately
started
stopped by the two pairs of
switches S1, S2 and S3, S4.
positioning
Appropriate
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.
2
Specifications are subject to change without notice (01.09.06)
DLA71
Wiring Diagrams
DLA71...2P
48/230 VAC 24/115 VAC
DLA71...3P
48/230 VAC 24/115 VAC
L
S4
S3
S2
S1
A1
A3
m
18
m
28
S4
S3
S2
S1
A1
L
A3
m
18
m
28
m
38
C
A2
N
15
C
A2
N
15
Operation Diagrams
Example 1
L
S4
S3
S2
S1
A1
A3
m
18
m
28
Power supply
S1
S2
C
A2
N
15
S3
S4
15 -18
S2
15 -28
S1
PUMP 2
PUMP 2
Automatic
rotation function
PUMP 1
PUMP 1
6h
6h
6h
6h
Working time
Example 2
L
S4
S3
S2
S1
A1
A3
m
18
m
28
Power supply
S1
S2
S3
S4
15 -18
15 -28
C
A2
N
15
S2
S4
S1
S3
PUMP 2
PUMP 2
Automatic
rotation function
PUMP 1
PUMP 1
6h
6h
6h
6h
Working time
Specifications are subject to change without notice (01.09.06)
3
DLA71
Operation Diagrams
Example 3
L
S4
S3
S2
S1
A1
A3
m
18
m
28
m
38
Power supply
S1
S2
S3
S4
15 -18
15 -28
15 -38
C
A2
N
15
S3
S2
S1
PUMP 3
PUMP 3
PUMP 2
PUMP 2
Automatic
rotation function
PUMP 1
PUMP 1
6h
6h
6h
6h
Working time
Example 4
L
S4
S3
S2
S1
A1
A3
m
18
m
28
m
38
Power supply
S1
S2
C
A2
N
15
S3
S4
15 -18
15 -28
S3
S2
15 -38
S1
S4
PUMP 3
PUMP 3
PUMP 2
PUMP 2
Automatic
rotation function
PUMP 1
PUMP 1
6h
6h
6h
6h
Working time
Dimensions
35.5
67.2
18.7
81
4
2
45
Specifications are subject to change without notice (01.09.06)
