Cybertronix SENTINEL EFI-MLZ User manual

PACKING CONTENTS:
•Control Unit: Grey ABS box enclosure with product information and warning labels
•Current Transformer: CT100 (standard) or CT120, CT150, CT300
•Mains Cable (optional): 3 meter lead (standard option), or as ordered
•Remote LED Indicator (optional): 2 meter lead (standard option), or as ordered
•Auxiliary Relay Cable (optional): 2 meter lead (standard option), or as ordered
INSTALLATION INSTRUCTIONS
Installing the Control Unit
The Control Unit is surface mounted using the two 4mm mounting holes provided. To access the mounting holes, unscrew the four screws securing
the lid of the Control Unit. Two M4 × 16mm bolts are located inside the enclosure for mounting the unit. After mounting, replace the cover of the
unit, and secure tightly with the four screws to ensure good sealing.
Installing the Remote Indicator (optional)
The remote indicator consists of a M10 bolt and should be mounted in a secure place where the indication is required.
Connecting the Auxiliary Relay (optional)
For additional remote fault signaling the auxiliary relay cable is connected through a cable gland to the two-way screw terminal marked “RELAY”.
This is a normally-open circuit.
Connecting the Mains Supply
The mains cable is connected though a cable gland to the two-way screw terminal marked “MAINS”.
Trip Level Selection (optional)
The trip level of the device is selected via a jumper located inside the control unit.
Installing the Current Transformer (CT)
The current transformer comprises of a flexible iron-core belt with a magnetic
pickup coil. The CT is wrapped tightly around the three-phase system to be
monitored using the adjustable cable ties provided.
NOTE: The CT should not encircle the HV cable earth lead as well. Instead the
earth lead should by-pass the CT, as shown in Figure 1 and Figure 2.
Multi-Core Cable System
The CT100 and CT150 sensors are used for multi-core cable systems. The CT is
mounted on the screened part of the cable below the strip-back point as shown
in Figure 1. The center cable-tie of the CT sensor is used to secure the sensor
firmly on the cable. The flexible iron-core of the sensor is wrapped in a closed
overlapping circle around the cable and pulled tightly with the second cable-tie as
far as is possible. The screen of the cable is turned back underneath the sensor
and terminated as shown.
Single-Core Cable System
For single-core cable systems a larger CT300 sensor is used. The flexible iron-core
of the sensor is wrapped in a closed overlapping circle around the cable as tightly
as possible and secured in place with cable-ties. Care should be taken to ensure
that the sensor is mounted on the screened part of the cable. The screen of all
three conductors should be turned underneath the core and terminated as
shown in Figure 2.
Please read safety instructions carefully
•Mains powered
•Flashing LED
•SCADA relay output contact
•Remote indicator output contact
•50A trip level
Sentinel™ EFI-MLZ
Earth Fault Indicator
LED Indicator
Mounting
Holes
Mains
Supply
Terminal
Remote
Indicator
Terminal
Auxiliary
Relay
Terminal
CT Terminal
Test/Reset
Pushbutton
Enclosure
Lid
Trip Level
Select
INSTALLATION INSTRUCTIONS

POWER UP and MANUAL TEST
NOTE: When the unit is first powered up from the mains supply, a period of up to 20 minutes is required to charge the on-board backup power
supply before the unit can become operational. This charge period is reduced if the backup supply is already partly charged and will also vary
depending on the level of mains supply voltage used.
Following installation it is important that the unit is tested with the Manual test facility provided.
The test sequence below should be followed.
1) Ensure that the unit is powered up for a period of up to 20 minutes.
2) Press the “Test / Reset” pushbutton on the front of the unit for a minimum of 3 seconds.
The LED indicator in the control unit will commence flashing at approximately 1Hz.
The auxiliary relay will latch in the closed position.
The remote indicator (if installed) will also flash at approximately 1Hz.
This test state will continue for a period of 60 seconds or until mains is present for 10 seconds or until the test pushbutton is pressed
again to terminate the manual test.
SAFETY
WARNING: Under certain fault conditions, high voltages can be conducted into the earth fault indicator enclosure through the
CT, remote indicator, or the auxiliary relay cables. All parts within the enclosure should be handled as if carrying dangerous voltages.
WARNING: Use extreme caution during the installation and use of the earth fault indicator as high voltages and currents may
be present in the circuit.
•Ensure that the current sensor is installed at earth potential on the HV cable system.
•Ensure that the current sensor is installed on the screened part of the cable system.
•Use caution during the installation and use of this product; high voltages and currents may be present in the circuit.
•This product must be used only by qualified personnel practicing applicable safety precautions.
•Wear protective clothing and gloves as required.
•Do not install this product on live conductors.
•Always de-energize circuit before installing the current sensor and indicating unit.
•Always inspect the current sensor, indicating unit and all leads for damage before using the product.
•Do not use the product if damaged.
Technical Data
Network voltage range: 1-36kV AC
Rated mains voltage: 110V-240V AC ±20% 50/60Hz
Over voltage withstand: 600V for 48 hours
Impulse voltage withstand: 10kV, 1.2/50uS waveform
Trip current: 50A ±20%
Minimum fault duration: 2.5 cycles (50ms@50Hz)
LED indicator flash rate: 1Hz
LED indicator flash duration: 12 hours nominal
Fault current withstand: 25kA for 1second
Supply charging time: 10-20 minutes
Operating temp range: -20ºC to 70ºC
Operating humidity range: 0-100% RH
Reset of fault: 10s of healthy mains or manual
reset pushbutton
Auxiliary Relay
Number of contacts: 1
Type: Latching, N/O on reset
Rating: Max voltage: 220VDC, 250VAC
Maximum switching: 60W
Maximum current 2A
Remote Indicator (optional)
Type: High intensity red LED
Flash rate: 1Hz
Flash duration 6 hours nominal
Lead type: 2-core, 0.5mm², double insulated
Mounting: M10 panel hole
!
Sentinel™ EFI-MLZ Installation Guide Ver. 3.2
Tel: [phone] Email: [e-mail]
3 Glenart Road, Kloof 3610, South Africa www.cybertronix.co.za
Page 2/2
(Ver. 3.2)