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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 suitable 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 k < 1 k < 25 V < 2 mA
Output Specifications
Output DLA71...2P DLA71...3P Rated insulation voltage Contact ratings (AgSnO2) AC 1 Resistive loads DC 12 Small inductive loads AC 15 DC 13 Mechanical life Electrical life 2 x SPST NO relay 3 x SPST NO relay 250 VAC 5 A @ 250 VAC 5 A @ 24 VDC 1.5 A @ 250 VAC 1.5 A @ 24 VDC 30 x 106 operations 105 operations (at 5 A, 250 V, cos = 1) 7200 operations/h
Operating frequency Dielectric strength Dielectric voltage 2 kVAC (rms) Rated impulse withstand volt. 4 kV (1.2/50 s)
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 s) 4 kV (1.2/50 s) 4 kV (1.2/50 s) 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 60C, R.H. < 95% -30 to 80C, 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 reaches 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 uniform 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. 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 automatically 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 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 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 automatically 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 continuously 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 systems) 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)

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