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TRANSFORMER COMPONENTS
Liquid level indicator
Instruction manual
3. Operating principle 10
3.1 Functioning 10
3.2. Outputs 10
3.3 Technical features 10
3.3.1 Microswitches 10
3.4 Tests 11
4. Installation 12
4.1 Float assembly 12
4.1.1 LA version (radial) 12
4.1.2 LB version (axial) 12
4.2 Liquid level indicator: general information 13
4.3 Comem L140 14
4.4 Comem OLI / eOLI 14
4.5 Comem OLI22 / eOLI22 (with special flange) 15
4.6 Comem L220 15
4.7 Comem L340 16
4.8 Comem eViewer 16
5. Electrical connection 17
5.1 Micro-switches wiring 18
5.2 Analog output and Modbus communication
wiring (for Comem eOLI and Comem eOLI22) 18
5.2.1 Power voltage 18
5.2.2 Analog output 18
5.2.3 Modbus communication (optional) 18
5.3 Comem eViewer wiring 18
5.3.1 Power voltage 18
5.3.2 Analog input 18
5.3.3 Comem eViewer – Comem eOLI connections 19
6 Operation and maintanence 20
6.1 Operation 20
6.2 Maintenance 20
6.3 Storage 20
A. Appendix A: MODBUS communication 21
A.1 MODBUS register 21
A.1.1 MODBUS address 21
Contents
1. Safety 2
1.1 Safety instructions 2
1.2 Specified applications 2
1.3 Safety notes on the equipment operation 2
2. Drawings 3
2.1 Comem OLI 3
2.2 Comem eOLI 3
2.3 Mounting flange 4
2.3.1 Comem OLI/eOLI (radial) 4
2.3.2 Comem OLI/eOLI (axial) 4
2.3.3 Comem OLI22 / eOLI22 (radial) 5
2.3.4 Comem OLI22 / eOLI22 (axial) 5
2.4 Comem L140 6
2.4.1 Radial 6
2.4.2 Axial
2.5 Comem L220 7
2.6 Comem L340 8
2.7 Comem eViewer 9
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LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
ALL RELEVANT FIRE REGULATION MUST BE
STRICTLY OBSERVED.
WARNING
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1. Safety
1.1 Safety instructions
Make sure that any person installing:
• Are technically qualified and competent.
• Fully comply with these assembling instructions.
Improper operations or misuse could cause danger to:
• Life and limb.
• To the equipment and other assets of the
operator.
• To the equipment proper, function.
Safety instructions in this manual are shown in three
different forms to emphasize important information.
1.2 Specified applications
The liquid level indicator is used in oil-insulated
transformer to indicate the conservator tank oil
level. Inside the device are usually installed up to
four micro-switches to signal some critical oil levels.
The micro-switches can give alarm or transformer
power off signals.
It is important to observe the limit values indicated
on the nameplate and in the manual before
commissioning the device.
1.3 Safety notes on the
equipment operation
Electrical installation is subject to the relevant
national safety rules.
It is mandatory to connect the grounding cable
because of safety reason.
INSTALLATION, ELECTRICAL CONNECTION AND
FITTING THE DEVICE HAVE TO BE CARRIED OUT
BY QUALIFIED PERSONNEL AND ONLY IN
ACCORDANCE TO THIS INSTRUCTION MANUAL.
IT IS RESPONSIBILITY OF THE USER TO MAKE
SURE THAT THE DEVICE IS USED FOR SPECIFIED
APPLICATION ONLY.
FOR SAFETY MATTERS, PLEASE AVOID ANY
UNAUTHORIZED AND IMPROPERLY WORKS.
CAUTION
THIS NOTE GIVES IMPORTANT AND SPECIFIC
INFORMATION CONCERNING THE EQUIPMENT.
NOTE
THIS INFORMATION INDICATES PARTICULAR
DANGER TO LIFE AND HEALTH. DISREGARDING
SUCH A WARNING CAN LEAD TO SERIOUS OR
FATAL INJURY.
THIS INFORMATION INDICATES PARTICULAR
DANGER TO EQUIPMENT AND/OR OTHER
PROPERTY OF THE USER. SERIOUS OR FATAL
INJURY CANNOT BE EXCLUDED.
WARNING
CAUTION
3
TRANSFORMER COMPONENTS
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2. Drawings
2.1 Comem OLI
Figure 2
Figure 1
2.2 Comem eOLI
4
LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
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2. Drawings
2.3 Mounting flange
2.3.1 Comem OLI/Comem eOLI (radial)
Figure 3
2.3.2 Comem OLI/ Comem eOLI (axial)
Figure 4
5
TRANSFORMER COMPONENTS
2.3.3 Comem OLI22 / Comem eOLI22 (radial)
Figure 5
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2. Drawings
2.3.4 Comem OLI22 / Comem eOLI22 (axial)
Figure 6
“4 HOLES” MOUNTING FLANGE MAY BE
DESIGNED IN ACCORDANCE WITH CUSTOMER’S
NEED: UPON REQUEST, SEVERAL HOLE
PATTERNS ARE AVAILABLE.
NOTE
6
LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
2.4 Comem L140
2.4.1 Radial
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2. Drawings
2.4.2 Axial
Figure 7
Figure 8
7
TRANSFORMER COMPONENTS
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2. Drawings
2.5 Comem L220
2.5.1 Radial
2.5.1 Axial
Figure 9
Figure 10
8
LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
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2. Drawings
2.6 Comem L340
2.6.1 Radial
2.6.1 Axial
Figure 11
Figure 12
9
TRANSFORMER COMPONENTS
2.7 Comem eViewer
Figure 13
10
LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
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3. Operating principle
Material All the external parts are resistant transformer oils, salt fog and UV rays.
Dial Tempered glass / Polycarbonate
Standard color
Ambient temperature
Oil temperature
Degree of protection
Standard cable gland
Wires
shielded twisted pair cable
Electronic board features, only for eOLI
Power consumption
Distance for analogical output
Distance for digital output
Ventilation Valve
Electronic board features, only for Viewer
Distance for analogical input
Ventilation Valve
3.3 Technical features
3.3.1 Microswitches
Breaking and making capacity
Voltage Uninterrupted current (making capacity) Interrupted current (breaking capacity)
Table 2
3.1 Functioning
The level gauge with magnetic joint is composed of
a sturdy, watertight body made of aluminum alloy
powder coated to protect against corrosion.
The movement of the float rod and the pointer takes
place thanks to magnetic coupling and reaches a
inside the conservator tank the movement of the
float cause the rotation of the magnet joint with
consequent variation of the indication on the dial of
the gauge.
The pointer indicate the level that the oil should
reach at the temperatures printed on the dial.
The electronic version of the oil level gauge provide
an analogical and a digital signal proportional to the
oil level inside the conservator. These signals can be
remote to: PLC, PC, integrated monitoring system,
Remote Indicator.
An electronic level indicator equipped with 4-20 mA
output signal can be coupled with the electronic
Viewer. This device replicate the value of oil level
3.2. Outputs
STANDARD CONFIGURATION
STANDARD
(Comem OLI-
ComemL140)
MICRO-SWITCHES
OPTIONS (Comem eOLI) ANALOG OUTPUT
Table 1
Table 3
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TRANSFORMER COMPONENTS
OIL LEVEL INDICATOR - INSTRUCTION MANUAL
3.4 Tests
Description Reference standard Description Reference standard
Fast transient/burs immunity test Emission standard
Harmonic current emission
Conducted disturbances Harmonic current emission
Electrostatic discharge Voltage fluctuations and flicker
Surge immunity test Vibration Test
Magnetic field immunity test Vibration Test
Power frequency magnetic field - -
Other values may be agreed between purchaser and
supplier. The minimum contact life shall be 1.000
operations.
EXPECTED USE : EXTERNAL
MAXIMUM ALTITUDE : 2000 M
MAXIMUM HUMIDITY : 80%
POLLUTION LEVEL : GRADE III
NOTE
FOR COMEM EOLI
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3. Operating principle
12
A
B
A B
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4. Installation
THE OPERATING AND THE INSTALLATION
REQUIREMENTS DESCRIBED IN THIS MANUAL
MUST BE STRICTLY FOLLOWING. IF NOT, THE
DEVICE CAN BE DAMAGED OR A MALFUNCTION
CAN OCCUR.
CAUTION
4.1 Float assembly
4.1.1 LA version (radial)
Screw the arm (Fig 14/A) into the hole of the
backside shaft and block it with the M4 nut
(Fig.14/B).
Figure 14
4.1.2 LB version (axial)
Insert the arm into the slot (Fig.15/A) on the
backside shaft with and block it with the M5 nut
(Fig.15/B).
Figure 15
LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
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TRANSFORMER COMPONENTS
4.2 Liquid level indicator: general
information
VERIFY CONTACT SURFACE OF THE
CONSERVATOR. IT MUST BE WELL LEVELED
WITH A GOOD DEGREE OF ROUGHNESS (RA=3.2
MICROMETER).
VERIFY AND IN CASE REMOVE ALL WELDING
BURRS TO ENSURE THAT THE WELDING WILL
NOT INTERFERE WITH THE HOUSING FLANGE
HOLES.
DURING THE FLANGE ASSEMBLY, ABB ADVICE
TO APPLY A FEW DROPS OF CYANOACRYLATE
GLUE ON THE GASKET TO FIX IT AT THE OIL
LEVEL FLANGE. THIS ACTION GUARANTEES A
GOOD GASKET POSITIONING AND IT
FACILITATES THE ASSEMBLY
APPLY A SPECIFIC TIGHTENING TORQUE (MAX
20 NM) ON THE NUTS FOLLOWING A CROSS
SEQUENCE.
CAUTION
Depending on the conservator design, the level
gauge can have different values of the parameters R
and S (Fig.16) according to the table 4.
Table 4 a
- “S”: parameter that indicates an offset from the vertical conservator
axis [mm]. It is available for LA (radial) configuration.
- “R”: parameter that indicates the length of the rod [mm]. It is available
for LA (radial) and LB (axial) configurations.
- “ØDC”: conservator diameter [mm].
Figure 16
FOR THE LB CONFIGURATION ABB ADVICE TO FIT
IT IN THE CENTER OF THE CONSERVATOR (S=0
MM)
NOTE
LA LB
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4. Installation
A
B
A
B
D
C
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LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
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4. Installation
4.3 Comem L140
Insert the arm with float through the machined hole
on the conservator. Place the o-ring on the slot
behind the gauge. Insert the device on the threaded
pin of the conservator flange (Fig.17/A). The oil level
indicator has to be mounted using the items
(Fig.17/B) showed in the table 4b.
Figure 17
Q.ty Description Reference standard
-
Table 4b
4.4 Comem OLI / Comem eOLI
Place the o-ring on the slot behind the gauge
(Fig.83/B) . Align the flange (Fig.18/C - stud length:
(depending on the conservator flange type). The
gauge has to be assembled on the flange using four
screws M4x12 (Fig.18/D). The oil level indicator
flange has to be assembled using the items showed
in the table 5.
Q.ty Description Reference standard
-
Table 5
Figure 18
B
C
D
A
15
TRANSFORMER COMPONENTS
Q.ty Description Reference standard
-
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4. Installation
4.5 Comem OLI22 / Comem
eOLI22 (with special flange)
Insert the arm with float through the machined hole
on the conservator. Place the o-ring in the slot
behind the flange (Fig.19/C). Insert the flange on the
threaded pins (Fig.19/A) of the conservator flange
and fix it with the items showed in the table 6
(Fig.19/B). Fix the gauge on the flange using 4
screws M4x12 (Fig.19/D).
Figure 19
Q.ty Description Reference standard
-
Table 6
4.6 Comem L220
Insert the arm with float through the machined hole
on the conservator. Place the o-ring on the slot
behind the gauge. Insert the device on the threaded
pin of the conservator flange (Fig L220/A). The oil
level indicator has to be mounted using the items
(Fig.L220/B) showed in the table L220.).
Q.ty Description Reference standard
-
Table L 220
Figure L220
4.7 Comem L340
• Insert the arm with float through the machined
hole on the conservator. Place the o-ring on the
slot behind the gauge. Insert the device on the
threaded pin of the conservator flange (Fig.
L340/A). The oil level indicator has to be mounted
using the items (Fig.L340/B) showed in the table
L340.
4.8 Comem eViewer
Arrange the transformer with a dedicated place
following the scheme in the figure 15. The
connection can be done in two alternative way:
• threaded pin and nut M6
• screws M6
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LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
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4. Installation
Figure L340
Q.ty Description Reference standard
-
Table L 3 40
Figure 20
17
TRANSFORMER COMPONENTS
C
A
B
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5. Electrical connection
QUALIFIED AND SKILLED PERSONNEL TRAINED
IN THE APPLICABLE HEALTH AND SAFETY
REGULATIONS OF THE RELEVANT COUNTRY
SHOULD ONLY PERFORM ELECTRICAL
CONNECTIONS.
CAUTION
DURING THE TERMINAL BOX ASSEMBLY, USE
CAUTION NOT TO DAMAGE THE OR GASKET
(FIG.15/A). IF THIS OCCURS, IT MUST BE
SUBSTITUTED.
IF YOU DO NOT USE ALL THE CABLE GLANDS,
PAY ATTENTION TO CLOSE THE FREE CABLE
GLAND WITH A PLUG WITH GASKET.
CAUTION
Remove the cover from the terminal box unscrewing
the 4 captive screws M4 (Fig.21/C). Insert the wires
through the cable gland (Fig.21/B) and wiring them
following the electrical scheme (Fig.22-23).
Figure 21
DANGEROUS ELECTRICAL VOLTAGES!
IT IS IMPERATIVE TO DEACTIVATE THE POWER
SUPPLY DURING WIRING OF THE DEVICE.
THE EDEVICE MUST BE POWERED BY A POWER
SUPPLY PROTECTED FROM OVERLOAD
(IMAX<340 MA)
WARNING
WARNING
PROVIDE TO THE EDEVICE A POWER SUPPLY
DISCONNECTION THROUGH AN EXTERNAL
SWITCH (IF THE DEVICE IS INSTALLED IN A
FIXED POSITION).
WARNING
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LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
1 + POWER SUPPLY
2 - 24 V DC
3 - ANALOG INPUT
4 + 4..20 mA
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5. Electrical connection
5.1 Micro-switches wiring
Wire the electrical cables in accordance with the
ordered model following the electrical scheme
showed in the figure 22.
DIAGRAM K DIAGRAM Y DIAGRAM X DIAGRAM W
5.2 Analog output and Modbus
communication wiring
(for Comem eOLI and Comem
eOLI22)
5.2.1 Power voltage
Connect the power voltage (as written on the label
on the terminal box cover) to terminals 1-2.
5.2.2 Analog output
Terminals for analog output 4-20 mA: 6-7
5.2.3 Modbus communication (optional)
Digital output RS485: terminals 3-4
(for the Modbus register and address, see the
Appendix A)
Figure 22
Figure 23
5.3 Comem eViewer wiring
5.3.1 Power voltage
Connect the power voltage (as written inside the
terminal box, fig.18) to terminals 1-2.
5.3.2 Analog input
Connect the analog signal (as written inside the
terminal box, Fig. 24) to terminals 6-7 : 4-20 mA.
Negative Comem eViewer (3) with negative Comem
eOLI (7). Positive Comem eViewer (4) with positive
Comem eOLI (6).
5.3.3 Comem eViewer – Comem eOLI connections
The following scheme (Fig.24) describes the
connections for signal remoting between an
electronic liquid level indicator and the eViewer.
Figure 24
19
TRANSFORMER COMPONENTS
Figure 25
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5. Electrical connection
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LIQUID LEVEL INDICATOR - INSTRUCTION MANUAL
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6. Operation and maintanence
The liquid level indicator devices are ready for
operation after installation, electrical connection
and power supply.
6.1 Operation
It is possible to detect the conservator oil level
observing the indicator dial:
• Minimum level: when the pointer indicates the MIN
position
• Maximum level: when the pointer indicates the
MAX position.
The electrical micro switches operate at an advance
of the oil level in the conservator. When there is a
double contact, for e.g. double MIN and/or double
MAX (schemes Y o W) the second contact operates at
COMEM ADVICES TO DISCONNECT THE EOLI/
EOLI-22/VIEWER DURING THE ELECTRICAL
TRANSFORMER ROUTINE TEST.
NOTE
6.2 Maintenance
During regular maintenance on the transformer, we
recommend performing the following checks on the
oil level indicator:
• Check the exterior condition of the device
• Remove dirt as necessary.
6.3 Storage
The liquid level indicators can be handled without
any tools. Handle the device with care.
NOT TO PAINT THE DEVICE. IN THIS CASE ANY
GUARANTEES CONCERNING THE CORROSION
RESISTANCE DECLINE.
ONLY MILD SOAP AND WATER SHOULD BE USED
TO CLEAN THE ELECTRICAL BOX COVER.
SOLVENTS MUST NOT BE USED FOR ANY
REASON AS THEY WILL DEGRADE THE
PERFORMANCE OF THE PAINT. USE OF
SOLVENTS ON THE UNIT WILL IMMEDIATELY
VOID THE WARRANTY.
CAUTION
The liquid level indicator must be stored in the
original packing and in a dry place with temperature
Upon receiving the device, please check:
• The outer surface of the packaging to ensure that
it is intact
• That there are no breakages
If damages are found, please contact ABB and
provide the information from the shipping list and
the serial number.
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