ELR-1D
Instruction manual
IM220-U v0.2
pag. 1 / 4
INSTRUCTION MANUAL
IM220-U v0.2
ELR-1D
EARTH LEAKAGE RELAY IN A SINGLE DIN MODULE
WITH SEPARATED CURRENT SENSOR
GENERALITY
The device type ELR-1D is an amperometric relay of maximum homopolar
differential current to use to control the insulation towards earth of networks of
Energy supplier, of electric machines, etc.
The device must be joined at a suitable toroidal current transformer of the CT line
in the way to point out the earth leakage current of the system to control and to
protect. The toroidal current transformer point out the vectorial sum of the current
present on the active conductor of single phase line, three-phase with or without
neutral (inside the toroidal current transformer will pass all phase conductor and if
present the neutral, but none protection conductor must pass), in the way to point
up the leakage current towards earth, depend of the insulation level line under
control.
When the current read exceed the threshold value set the exchanging contact,
available in output, will commute in the way to protect the line under control using
opportune opening coils switch or contactor or to signal at distance the low
insulation condition of the line or equipment under control.
INTRODUCTION
The ELR-1D has a case with reduced dimension (1 module of 17.5 mm) to mount
on a DIN rail, in the way to use it in the application where the space available is
limited.
A wide range of current and time of delay calibration, allows to use it in a lot of
application, both like signalling of low insulation and like protection line according
with the norms (EN 60947-2 attachment M), to realize adequate vertical and
horizontal selectivity, etc.
The device has the following principal features: on input circuits of the measure
circuit has opportune filters doing it exempt by external noises. The functioning is
insured also with sinusoidal current and unidirectional button (type A according to
norms IEC 755).
On the front it’s possible to program the tripping current (30mA ÷ 30 A), the
tripping delay (0,02 ÷ 5 sec.) using some micro-switches. The device has a
normally open contact in output for tripping and manual reset functioning (reset
button).
MODELS:
In basis of power supply there are 4 models:
-
ELR-1D-230:
220÷240Vac
(standard)
- ELR-1D-110: 100÷130 Vac/dc
(optional)
-
ELR-1D-48:
48Vac/dc
(optional)
-
ELR-1D-24:
24Vac/dc
(optional)
INSTALLATION
Only a qualified technician can do the installation. The instrument installation must be done in total absence of voltage.
The instrument must be intact and it haven’t damages caused of transport. The power supply must be compatible with the
tool range.
The wire of connection between the relay and the toroidal current transformer must be twisted or shielded in presence of
strong electromagnetic noises or considerable length. It’s better to use a cable with a section of 1 mm
2
and a length lower
than 30 meters. The toroidal current transformer must be connected at the terminals 1-2 (coil of measure).
To test the device it’s possible to use the bottom of TEST that caused the intervention of relay after the delay set.
1 2 3
4 5 6
RESET
0,3
I n(A)
1
2
delay
t
(sec)
0,02
0,1
0,3
0,5
x1
x10
x1
x0,1
TEST
ON
3
TRIP
ELR
‐
1D
RESET
I n(A)
delay t (sec)
0,3
0,02
x10
x1
x10
1
2
0,1
0,2
0,2
x1
x0,1
TEST
ON
3
