specifications are subject to change without notice (01.09.06) 1 monitoring relays product description ordering key housing function type item number output power supply number of pumps ? 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 d in/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 contact input terminals dla71...2p (normal mode) on/off 1 pump c, s1 on/off 2 pumps c, s2 dla71...2p (differential mode) first pump star ts c, s1 first pump stops c, s3 second pump start c, s2 second pump stop c, s4 dla71...3p (normal mode) on/off 1 pump c, s1 on/off 2 pumps c, s2 on/off 3 pumps c, s3 dla71...3p (full mode) on 1 pump c, s1 on 2 pumps c, s2 on 3 pumps c, s3 off all pumps c, s4 disabled > 10 k enabled < 1 k v oltage < 25 v cur rent < 2 ma pump alternating type dla71 input specifications dla 71 t b23 3p 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 pr evious 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. type selection mounting output function supply: 24/48 v ac 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 output dla71...2p 2 x spst no relay dla71...3p 3 x spst no r elay rated insulation voltage 250 v ac contact ratings (agsno 2 ) resistive loads ac 1 5 a @ 250 vac dc 12 5 a @ 24 vdc small inductive loads ac 15 1.5 a @ 250 vac dc 13 1.5 a @ 24 vdc mechanical life 30 x 10 6 operations electrical life 10 5 operations (at 5 a, 250 v , cos ? = 1) operating fr equency 7200 operations/h dielectric strength dielectric voltage 2 kv ac (rms) rated impulse withstand volt. 4 kv (1.2/50 s) output specifications
2 specifications are subject to change without notice (01.09.06) mode of operation dla71 is made for pumping systems wher e 2 or 3 pumps are in parallel. it lets the pumps work alternatively, allowing mor e 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 star ts. as soon as s1 switches back the pump stops. when switch s1 is activated again the other pump star ts 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 star ted and stopped by the two pairs of switches s1, s2 and s3, s4. appr opriate 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 star ts. this rotation is repeated every 6 hours of single and continuative work of a pump. example 3 (emptying a basin, 3-pump system, nor mal mode) the system works exactly as described in example 1 except that if switch s3 is r eached three pumps work at the same time. when they switch back the pumps are turned off in sequence start- ing fr om the one r unning 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 star ts (r escue 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 star ts. if also the second pump works continuously alone for 6 hours, it is stopped and the third pump is then star ted. if a couple of pumps is con - tinuously working for 6 hours, the one r unning 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 n ote: if more than one pump i s active, the indication refers to the pump started last. environment (en 60529) degree of protection ip 20 pollution degree 3 o perating temperatur e -20 to 60, r.h. < 95% s torage temperature -30 to 80, r.h. < 95% housing dimensions 35.5 x 81 x 67.2 mm material pa 66 w eight appr ox. 135 g screw terminals tightening torque max. 0.5 nm acc. to iec 60947 approvals ul, csa ce marking ye s emc electromagnetic compatibillity immunity accor ding 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% 4 5 to 65 hz, insulated b 23: 115/230 vac 15% 45 to 65 hz, insulated dielectric voltage supply to input 4 kv (1.2/50 s) supply to output 4 kv (1.2/50 s) i nput to output 4 kv (1.2/50 s) 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
specifications are subject to change without notice (01.09.06) 3 dla71 wiring diagrams 48/230 vac 24/115 vac 48/230 vac 24/115 vac dla71...2p d la71...3p operation diagrams example 1 example 2 pump 2 p ump 1 6 h 6 h 6 h 6 h w orking time automatic rotation function pump 2 pump 1 6 h 6 h 6 h 6 h working time automatic rotation function n s1 s 2 a 1a3 a 215 18 l 28 c s 3 s 4 m m s1 s 2 n m s1 s2 a1 a3 a2 15 18 l 28 c s3 s4 m p ower supply s2 s1 s3 s4 15 -18 15 -28 s3 s4 n m s1 s2 a1 a3 a2 15 18 l 28 c s3 s4 s1 s2 m power supply s2 s1 s3 s4 15 -18 15 -28 pump 2 pump 1 pump 2 pump 1 n s1 s2 a1 a3 a2 15 1 8 l 2 8 c s 3 s4 3 8 m m m
4 specifications are subject to change without notice (01.09.06) pump 2 p ump 1 6 h 6 h 6 h 6 h dimensions operation diagrams e xample 3 dla71 e xample 4 automatic r otation function p ump 3 p ump 2 pump 1 6 h 6 h 6 h 6 h working time automatic rotation function pump 3 working time pump 3 pump 2 pump 1 power supply s2 s1 s3 s4 15 -18 15 -28 15 -38 67.2 6 7. 2 18.7 1 8 . 7 4 5 4 5 35.5 3 5.5 8 1 8 1 2 s 3 s 1 s 2 n m s 1 s2 a1 a3 a2 15 18 l 28 c s3 s4 m 38 m p ower supply s2 s1 s3 s 4 15 -18 15 -28 15 -38 s 4 s3 s1 s 2 n m s1 s 2 a 1a3 a2 15 18 l 28 c s3 s4 m 38 m pump 3 pump 2 pump 1
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