1 IR420-D4 series digital ground fault monitor / ground detector ungrounded (floating) ac systems technical bulletin nae1012090 / 04.2011
bender inc. ? 700 fox chase, coatesville pa 19320 ? ph: 800-356-4266 / 610-383-9200 ? fax: 610-383-7100 a-isometer? IR420-D4 ground fault monitor / ground fault relay for ungrounded ac systems less than 300 v a-isometer? ir420 device features ? insulation monitoring for ungrounded, low-voltage circuits ac 0300 v ? two separately adjustable response values ? preset function (automatic assignment of basic parameters) ? connection monitoring ? leds: power on, alarm 1, alarm 2 ? internal/external test/reset button ? two separately adjustable spdt contacts ? normally energized or normally de-ener- gized operation ? latching or non-latching behavior ? detailed lcd display ? adjustable response delay ? two-module enclosure (36 mm) ? rohs compliant approvals product description the a-isometer? IR420-D4 monitors for ground faults in ungrounded ac systems from 0 to 300 v by measuring the system's insulation resistance. the IR420-D4 is designed to provide predictive maintenence and detect ground faults in ungrounded systems before leakage current may even be present. an external supply voltage is required to power the device. application ? general purpose industrial use in ac/dc control circuits ? ungrounded systems at 300 v or less function when the insulation resistance from system to ground falls below the set response value, the alarm relays switch and the alarm leds activate. two separately adjustable alarm contacts can be set to a prewarning and main warning alarm. the measured value is indi - cated on the lcd display. a fault storage setting allows the device to either latch or auto - matically reset. test and reset may be activated on the device or via a remote connec - tion. the IR420-D4 continuously monitors the equipment ground connection to ensure proper operation. the device's easy-to-use onboard menu manages all settings via the detailed lcd display. preset function the ir425 provides a preset function which, when first started up, will set response value alarms based on initial readings. measuring principle the a-isometer? IR420-D4 uses a superimposed dc voltage measuring principle.
a-isometer? irdh275 operating elements wiring diagram 1 1 2 7 4 5 3 6 2 3 4 5 6 7 1 - power on led on; flashes during connection error 2 - alarm led al1, insulation fault, alarm 1 reached (flashes duri - ng connection error) 3 - alarm led al2, insulation fault, alarm 2 reached (flashes duri - ng connection error) 4 - lcd display 5 - test button t: activates self-test arrow up key: scrolls up inside device's menu 6 - reset button r: resets device arrow down key: scrolls down inside device's menu 7 - menu key: activates device's internal menu enter key: confirm changes inside device's menu 1 - supply voltage u s (see ordering information) via fuse 2 - equipment ground connections 3 - connection to monitored system 4 - alarm relay k1: alarm 1 5 - alarm relay k2: alarm 2 6 - combined external test and reset button t/r: quick press (< 1.5 s) = reset hold (> 1.5 s) = test 7 - recommended line protection via fuse
a-isometer? IR420-D4 technical data: a-isometer? IR420-D4 insulation coordination acc. to iec 60664-1/iec 60664-3 rated insulation voltage 250 v rated impulse voltage/pollution degree 2.5 kv / iii protective separation (reinforced insulation) between (a1, a2) - (l1, l2, e, ke, t/r) - (11, 12, 14) - (21, 22, 24) voltage test according to iec 61010-1 2.21 kv supply voltage supply voltage u s see ordering information power consumption 3 va it system being monitored nominal system voltage u n ac 0300 v rated frequency f n 42460 hz response values response value r an1 (alarm 1) 1200 k ? response value r an2 (alarm 2) 1200 k ? preset mode u n 72 v r an1 (alarm 1) = 20 k ?/r an2 (alarm 2) = 10 k ? u n > 72 v r an1 (alarm 1) = 46 k ?/r an2 (alarm 2) = 23 k ? operating error 1 k ? 5 k? /5 k? 200 k? 0.5 k ? / 15 % hysteresis 25 % specified time response time t an at r f = 0.5 x r an and c e = 1 f 1 s start-up delay t 010 s (0 s)* response delay t on 099 s (0 s)* measuring circuit measuring voltage u m 12 v measuring current i m (at r f = 0 ?) 200 a internal dc resistance r i 62 k ? impedance z i at 50 hz 60 k ? permissible extraneous dc voltage u fg dc 300 v permissible system leakage capacitance c e 20 f displays, memory display range, measuring value 1 k ? 1 m? operating error 1 k ? 5 k? /5 k? 1 m? 0.5 k ? / 15 % password off / 0999 (off)* fault memory, alarm relay on/off* outputs cable length test and reset button 10 m switching elements number of switching elements 2 spdt contacts operating principle normally energized or normally de-energized electrical service life 10.000 switching operations contact data acc. to iec 60947-5-1 utilization category ac-13 ac-14 dc-12 dc-12 dc-12 rated operational voltage 230 v 230 v 220 v 110 v 24 v rated operational current 5 a 3 a 0.1 a 0.2 a 1 a minimum current 1 ma at ac/dc 10 v environment/emc emc iec 61326 operating temperature - 25 c+ 55 c climatic class acc. to iec 60721 stationary use (iec 60721-3-3) 3k5 (except condensation and formation of ice) transport (iec 60721-3-2) 2k3 (except condensation and formation of ice) long-time storage (iec 60721-3-1) 1k4 (except condensation and formation of ice) classification of mechanical conditions iec 60721 stationary use (iec 60721-3-3) 3m4 transport (iec 60721-3-2) 2m2 long-time storage (iec 60721-3-1) 1m3 connection connection type screwless-type terminals connection properties: rigid / flexible 0.22.5 mm 2 (awg 2414) flexible with connector sleeve 0.21.5 mm 2 (awg 2416) stripping length 10 mm release force 50 n test aperture, diameter 2.1 mm other operating mode continuous operation mounting any position degree of protection, internal components (iec 60529) ip30 (nema 1) degree of protection, terminals (iec 60529) ip20 (nema 1) enclosure material polycarbonate din rail mounting acc. to iec 60715 screw mounting 2 x m4 with mounting clip product standards din en 61557-8: 1998-05, en 61557-8: 1997-03, iec 61557-8: 1997-02, astm f 1207m-96 (2002) operating manual bp101012 weight 150 g ( )* = factory setting
document nae1012090 / 04.2011 / ? bender inc. canada ? brampton, on toll-free: 800-243-2438 ? fax: 905-799-3051 north american headquarters ? coatesville, pa toll-free: 800.356.4266 ? fax: 610.383.7100 www.bender.org ? e-mail: info@bender.org accessories -hmv pm /lpa/ mlfo f/d3t gdvmcda3cuodumlfo f/d d 0mfudg u3udgucdnui 3u- dywdyyy d ordering information -hm paifrdnloho vil3an d0vwl: r summnhl3an d0vwl: s evomarovl3dnuvle dr sho vilnvdwd0vltdmdtf drtvle v pm /lpa/ mgpry4p4t epdprpwyddyyydf pd?wpdfaepdprpwyddtwrdfd tryyds ?lmelzl >l?4e4l,xe? ydxmebkxbm 9hlxm5x,elfwle58eelc khle58eelc)9hlxm5x,elfwle58eelcl 45meels ?lmelzl >l?4e4l,xe/ device version with screw-type terminals on request. * absolute values dimensions (dimensions in inches) 1.42 2.78 1.87 1.22 2.66 1.77 3.54 4.57 3.94 screw fixing note: the upper mounting clip must be ordered separately (see ordering information). open the front plate cover in direction of arrow!
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