Page 2
EL731 AC/DC Sensitive Earth-Leakage Relay Rev. 2
Pub. EL731, February 28, 2012
2. INSTALLATION
Outline and details for panel-mounting an EL731 are
shown in Fig. 1. Insert the EL731 through the cutout and
slip the panel-mount clamp over the EL731 body. Slide
the panel-mount clamp forward to engage the latch tabs
with the mating body retainer grooves. Lock the unit in
place by tightening the four clamp screws against the
panel.
NOTE: Do not over tighten the clamp screws as this
might deform the clamp and release the latch tabs.
Outline and details for surface-mounting the EL731
are shown in Figs. 2. A detailed instruction sheet is
included with the optional AC700-SMK Surface-
Mounting Hardware Kit.
2.1 SYSTEM WIRING
A typical connection diagram for the EL731 is shown
in Fig. 4 and terminal-layout diagrams are shown in Fig.
3.
2.1.1 SUPPLY VOLTAGE
Provide supply voltage from the line side of the
controller or from an independent source. Connect
supply voltage to terminals 14 and 15 (L1, L2/N) as
shown in Fig. 4. In 120-Vac systems, L2/N is designated
as the neutral conductor. For direct-current power
supplies, use L1 for the positive terminal and L2/N as the
negative terminal. Connect terminal 16 ( ) to ground.
2.1.2 CURRENT TRANSFORMER CONNECTIONS
This earth-leakage relaying system consists of an
EL731 earth-leakage relay and one or two EFCT-series
current sensors connected as shown in Fig. 4.
The system can use CT1 or CT2 individually or
combined.
Pass the phase conductors through the CT window(s)
and position them in the centre of the opening (for 4-wire
and single-phase systems, also pass the neutral conductor
through the CT window). Do not pass earth conductors
through the CT window. In applications that require
shields or drain wires to pass through the CT window,
return them through the CT window before connecting
them to earth.
Using shielded twisted-pair cable, connect CT1 to
terminals 8 and 7 and connect the shield to terminal 6.
Current-sensor connections are not polarity sensitive.
See Figs. 7, 8 and 9 for current-sensor dimensional
drawings. Each EFCT-series sensor includes 6 m (19.2’)
cable.
Using shielded twisted-pair cable, connect CT2 to
terminals 11 and 10, connect the shield to terminal 9.
Current-sensor connections are not polarity sensitive.
See Figs. 7, 8 and 9 for current-sensor dimensional
drawings. Each EFCT-series sensor includes 6 m (19.2’)
cable.
2.1.3 ANALOG OUTPUT
The 4-20-mA analog output is loop powered. The
connection is shown in Fig. 4. The analog output is
isolated to 120 Vac from all other EL731 terminals.
2.1.4 PTC OR RTD INPUT
The temperature-sensor input can be configured for
either RTD or PTC operation. Connect as shown in
Fig. 4.
Select the sensor type in the Setup | Hardware | Temp
Sensor menu
2.1.5 ETHERNET/IP COMMUNICATIONS (OPTIONAL)
The EL731 supports an Ethernet/IP communications
interface. The communications interface module installs
through the side of the enclosure as shown in Fig. 5.
To field-install an AC-700-CUA Communications
Upgrade Adapter, remove the supply voltage, remove the
adapter access cover, insert the adapter, and retain with
the supplied screws. Apply the supply voltage.
With the communications module installed, a standard
RJ45 network cable can be used to connect the EL731 to
an Ethernet/IP network. Configure the interface using the
IP config software available at www.startco.ca. The
software requires Microsoft Windows operating system.
The Ethernet interface supports 10/100-Mbit, full- or
half-duplex operation.
2.1.6 REMOTE RESET
If required, connect a normally open switch to the
remote-reset input (terminals 12 & 13) as shown in
Fig. 4.
2.1.7 RELAY OUTPUTS
The EL731 has three programmable Form-C relay
outputs. Program choices are trip, alarm, watchdog or
current detected. See Section 3.2.3.3.
2.2 CALIBRATION
If the low-frequency CT1 input is used, the EL731
must be calibrated in order to ensure an accurate current
measurement.
To calibrate, connect an EFCT-series current sensor to
the EL731 and ensure that no CT-primary current is
present. Apply EL731 supply voltage and navigate to
menu item Setup | Protection | CT1 Earth Fault |
Calibrate. Press Enter to begin the calibration process.
The CT LED will flash, during the calibration process,
which takes about 30 seconds.
If the CT is ever replaced, this procedure must be
repeated to maintain current-measurement accuracy.
Datasheet pdf - http://www.DataSheet4U.net/
