Yezhong Electric DLA71 Technical data
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
IN/EN 50 022
D
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 Ordering Key
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 suitable both for back and front
panel mounting.
Housing
Function
Type
Item number
Output
Power supply
Number of pumps
DLA 71 T B23 3P
Type Selection
Mounting Output Function Supply: 24/48 VAC Supply: 115/230 VAC
DIN-rail 2 x SPST For two pumps DLA 71 D B48 2P DLA 71 D B23 2P
DIN-rail 3 x SPST For three pumps DLA 71 T B48 3P DLA 71 T B23 3P
Input Specifications
Contact input Terminals
DLA71...2P (normal mode)
ON/OFF 1 pump C, S1
ON/OFF 2 pumps
DLA71...2P (differential mode)
first pump starts
first pump stops C, S3
second pump start C, S2
second pump stop C, S4
DLA71...3P (normal mode)
ON/OFF 1 pump
ON/OFF 2 pumps C, S2
ON/OFF 3 pumps
DLA71...3P (full mode)
ON 1 pump C, S1
ON 2 pumps C, S2
ON 3 pumps C, S3
OFF all pumps
C, S2
C, S1
C, S1
C, S3
C, S4
Output Specifications
Output DLA71...2P 2 x SPST NO relay
Rated insulation voltage 250 V
Contact ratings (AgSnO
Resistive loads
Small inductive loads AC 15 1.5 A @ 250 VAC
Mechanical life ≥ 30 x 106operations
Electrical life ≥ 10
Operating fr
Dielectric strength
Dielectric voltage
Rated impulse withstand volt. 4 kV (1.2/50 µs)
DLA71...3P 3 x
DC 12
DC 13 1.5 A @ 24 VDC
equency
)
2
AC 1
SPST NO r
AC
µ
5 A @ 250 VAC
5 A @ 24 VDC
5
operations
(at 5 A, 250 V
≤ 7200 operations/h
AC (rms)
2 kV
elay
, cos
ϕ = 1)
Disabled > 10 kΩ
Enabled
oltage
V
rent < 2 mA
Cur
< 1 k
< 25 V
Ω
1
DLA71
Supply Specifications
Power supply Overvoltage cat. III
Rated operational voltage (IEC 60664, IEC 60038)
through terminals:
A1, A2 or A3, A2
Dielectric voltage
Supply to input 4 kV (1.2/50 µs)
Supply to output 4 kV (1.2/50 µs)
nput to output 4 kV (1.2/50 µs)
I
Rated operational power
AC 3 VA
B48: 24/48 VAC ± 15%
B
5 to 65 Hz, insulated
4
23: 115/230 VAC ± 15%
45 to 65 Hz, insulated
General Specifications
Reaction time
Minimum delay to activate
Continous working time to
activate the rotation pumps 6 h ± 10%
ndication for
I
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
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
Weight Approx. 135 g
Screw terminals
Tightening torque Max. 0.5 Nm
Approvals UL
CE Marking Yes
EMC
Immunity According to EN 61000-6-2
Emission According to EN 61000-6-3
Closing input < 100 ms
Opening input < 100 ms
the rescue pumps 10 s
Note: if more than one pump
is active, the indication refers
to the pump started last.
acc. to IEC 60947
Electromagnetic Compatibillity
Mode of Operation
DLA71 is made for pumping
systems where 2 or 3 pumps
are in parallel. It lets the
pumps work alternatively,
allowing mor
work togheter in case of
need.
Example 1
(emptying a basin, 2-pump
system)
As soon as the liquid reaches switch S1 one pump
ts. As soon as S1
star
switches back the pump
stops. When switch S1 is
activated again the other
pump star
form wear and tear of all the
pumps. If switch S2 is activated both pumps start (2
pumps running at the same
time). When S2 switches
back the pump running
since most time stops.
e pumps to
ts allowing uni
-
Example 2
(emptying a basin, 2-pump
system, differential mode)
In this case the pumps are
separately star
stopped by the two pairs of
switches S1, S2 and S3, S4.
opriate positioning
Appr
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
ts.
ly star
This rotation is repeated
every 6 hours of single and
continuative work of a
pump.
Example 3
(emptying a basin, 3-pump
system, nor
The system works exactly as
ted and
mal mode)
described in example 1
except that if switch S3 is
reached three pumps work
at the same time. When they
switch back the pumps ar
turned off in sequence starting from the one running
.
longer
Example 4
(emptying a basin, 3-pump
system, full mode)
As soon as the liquid reaches switch S1 one pump
starts. When it drops below
switch S4 it stops. If switch
S1 is trigger
pump star
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
ed again another
ts. If switch S2 is
working with only one pump,
after working for 6 hours,
DLA71 stops the pump and
the second one automatical-
ts. If also the second
ly star
e
pump works continuously
alone for 6 hours, it is
stopped and the thir
is then star
If a couple of pumps is continuously working for 6
hours, the one running for
more time stops and the free
one star
This rotation is repeated
every 6 hours of continuative
work of a pump or a couple
of pumps.
Note (2 and 3-pump systems)
In case the task is to fill a
basin, all the switches are
eversed in the basin itself.
r
ted.
ts.
d pump
2
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