Murphy Network Card ELD2 User Manual

M060501  
Issue 4, revised 09/98  
Catalogue section 75  
R
The Generator Controls Division of  
ELD series  
EARTH LEAKAGE DETECTOR UNITS  
A range of versatile and economical earth leakage  
detection relays. Each unit is housed in a robust, glass  
filled nylon case: an aperture in the casing allows the  
installation cabling to be passed through the integral  
core balance transformer.  
The electronic circuitry combines a stable amplification  
of the transformer output with an ability to give high  
sensitivity and fast operating speeds. Detection of an  
earth fault results in the energisation and latching of the  
unit's SPCO relay. The unit is reset by momentarily  
removing the auxiliary supply.  
Protection from excessive fault current and supply  
transients are fitted as standard, as is filtering to allow use  
with chopped waveform and variable drive applications.  
A 'test' facility is supplied in the form of a button, either  
pre-fitted into the unit's front facia or connected remotely.  
Product Specification  
Power supply:  
operating voltages (ranges)  
110V AC (100 – 120 V)  
230 V AC (200 – 250 V)  
415 V AC (380 – 440 V)  
< 100mA  
(all for 50/60Hz.)  
Electrical connection on standard units is by a colour coded,  
6 way flying lead, with terminal blocks available as an  
option. Each unit may be mounted on a front panel or back-  
plate using two 3mm threaded inserts; an optional mounting  
assembly (part no. EMA) is also available for front access  
back-plate mounting.  
power consumption  
Control:  
trip levels  
trip point accuracy  
fixed and variable, 10mA to 30A  
to BS4293  
Relay output:  
(ratings for resistive load)  
Standard units include:  
SPCO contacts, rated  
3A @ 250V AC/30V DC,  
1A @ 440V AC  
ELD2 Basic unit, with 20mS typical trip time.  
Fast response to earth leakage faults.  
ELD4 As ELD2, but with longer trip delays, 80mS  
to 5 secs. Prevents nuisance tripping in motor  
protection circuits and allows time discrimination  
in distribution networks.  
Physical:  
operating temperature  
standard unit: –25 to +40°C  
'HT' spec.: –25 to +60°C  
approx. 330 g  
weight (with EMA)  
ELD5 As ELD4, but with an adjustable trip delay.  
Available in various time ranges up to 2 seconds.  
Connection (standard unit)  
With options:–  
RED  
L1  
GREEN  
WHITE  
'VS'  
'HT'  
'TB'  
'RC'  
Adjustable trip current (via front facia potentiometer.)  
High temperature specification (to +60°C ambient).  
Screw terminal connectors instead of flying leads.  
Special calibration and 1m wiring for use with  
remote CTs (for RTCs of >125mA).  
External  
Test  
Button  
ELD  
Test  
BLUE  
Variations on our standard units and options are also  
available: please call with your requirements.  
When ordering, please specify:–  
YELLOW  
a) Product type number (ELD2, ELD5, etc.)  
b) Auxiliary supply voltage  
BLACK  
L2 or N  
c) Trip current (fixed, or variable range for VS option)  
d) System frequency (50, 60 or 400 Hz.)  
e) Trip delay time (fixed or variable, according to model)  
f) Additional options, if required.  
Dimensions (mm)  
EMA  
ELD  
4
31  
Accessories:–  
162  
136  
EMA  
Mounting assembly for ELD series.  
Remote CTs A range of remote core balance/current  
transformers, enabling specially  
176  
148  
calibrated ELD units to be used with  
larger cables. Available in a range of  
sizes, with or without a magnetic screen  
(see sheet M060101 for full details).  
3
59  
25  
25  
Frank W. Murphy Ltd.  
Frank W. Murphy Ltd. en France  
Frank W. Murphy Southern Division  
Murphek Pty. Ltd.  
Incorporating Modex Automation  
Church Road, Laverstock, Salisbury U.K.  
Tel: +33 (1) 30 76 26 26 Fax: +33 (1) 30 76 39 89 PO Box 1819, Rosenberg, Texas 77471, USA  
1620 Hume Highway, Campbellfield, Vic. 3061 Australia  
Tel: + 61 3 9358 5555 Fax: + 61 3 9358 5558  
Direct usine Tel: + 44 1722 410697  
Tel: + 1 281 342 0297 Fax: + 1 281 341 6006  
email: sales@fwmurphy.com  
Tel: + 44 1722 410055 Fax + 44 1722 410088 email: [email protected]  
Since 1939  
Pour service en Français, tél: + 44 1722 410697  
Frank W. Murphy Manufacturer  
PO Box 470248, Tulsa, Oklahoma 74147, USA  
Tel: + 1 918 627 3550 Fax: + 1 918 664 6146  
email: sales@fwmurphy.com  
Frank W. Murphy Pte, Ltd.  
Murphy Switch of California  
Murphy de Mexico S.A. de C.V.  
email: sales@fwmurphy.co.uk  
No. 2 Tuas South Street 2, Sprintecs Building  
PO Box 900788, Palmdale, California 93590, USA Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje  
02-01/02, Singapore 637895  
Tel: + 1 805 272 4700 Fax: + 1 805 947 7570  
email: sales@murphyswitch.com  
San Luis Potosí, S.L.P. México 78384  
Tel: + 52 48 206264 Fax: + 52 48 206336  
email: murmexsl@sanluis.podernet.com.mx  
Tel: + 65 863 1398 Fax: + 65 863 0208  
email: fwmsales@fwmurphy.com.sg  
 

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