ABB eOLI - User Manual

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ALL RELEVANT FIRE REGULATION MUST BE

STRICTLY OBSERVED.

WARNING

—

TRANSFORMER COMPONENTS

Electronic Liquid level indicator eOLI/eOLI22 and Comem

eViewer

Quick start

1. Safety

1.1 Safety instruction

Make sure that any personnel 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 proper function of the equipment

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 operating

instruction 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

THIS INFORMATION INDICATES PARTICULAR

DANGER TO EQUIPMENT AND/OR OTHER

PROPERTY OF THE USER. SERIOUS OR FATAL

INJURY CANNOT BE EXCLUDED.

CAUTION

THIS INFORMATION INDICATES PARTICULAR DANGER TO

LIFE AND HEALTH. DISREGARDING

SUCH A WARNING

CAN LEAD TO SERIOUS OR

FATAL INJURY.

WARNING

THIS NOTE GIVES IMPORTANT AND SPECIFIC

INFORMATION CONCERNING THE EQUIPMENT.

NOTE

INSTALLATION, ELECTRICAL CONNECTION AND

FITTING

THE DEVICE MAY ONLY BE PERFORMED

BY QUALIFIED

PERSONNEL AND ONLY IN ACCORDANCE WITH THIS

INSTRUCTION

MANUAL. IT IS THE RESPONSIBILITY OF

THE

USER TO ENSURE THAT THE DEVICE IS USED FOR

SPECIFIED APPLICATION ONLY.

FOR SAFETY REASONS, PLEASE AVOID ANY

UNAUTHORIZED AND IMPROPER USAGE.

ALL RELEVANT FIRE PROTECTION REGULATIONS

MUST BE STRICTLY FOLLOWED

CAUTION

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Overview

Function Description
Safety Instructions
Important Technical Specifications
Material
Environmental Conditions
Cable Glands and Wires
Electronic Board Features (eOLI/eOLI22)
Electronic Board Features (Comem eViewer only)
Breaking and Making Capacity
Usage Features
Installation
Modbus Communication Parameters (for eOLI/eOLI22)
Electrical Connection
Micro-switches Operation
Maintenance Features
Troubleshooting

The ABB Electronic Liquid Level Indicator eOLI/eOLI22 and Comem eViewer are components designed for use with oil-insulated transformers to monitor and indicate the conservator tank oil level. This quick start guide provides essential safety information, technical specifications, and installation instructions for these devices.

Function Description

The primary function of the liquid level indicator (eOLI/eOLI22) is to provide an accurate reading of the oil level within a transformer's conservator tank. These devices typically incorporate up to four micro-switches internally, which can be configured to signal critical oil levels. These signals can trigger alarms or initiate transformer power-off sequences, enhancing operational safety and preventing potential damage. The Comem eViewer acts as a remote display unit, allowing for the visualization of the oil level indicated by the eOLI/eOLI22 from a separate location.

Safety Instructions

Safety is paramount during the installation and operation of these devices. Only technically qualified and competent personnel, who fully comply with the provided assembling instructions, should perform installation. Improper operations or misuse can lead to serious or fatal injury, damage to equipment, or compromise the proper function of the equipment.

Three types of safety messages are used in the manual:

WARNING: Indicates particular danger to life and health. Disregarding such a warning can lead to serious or fatal injury.
CAUTION: Indicates particular danger to equipment and/or other property of the user. Serious or fatal injury cannot be excluded.
NOTE: Provides important and specific information concerning the equipment.

Electrical installation must adhere to relevant national safety rules. It is mandatory to connect the grounding cable. All relevant fire regulations must be strictly observed. Installation, electrical connection, and fitting of the device should only be performed by qualified personnel and in accordance with the instruction manual. Users are responsible for ensuring the device is used only for its specified application. Unauthorized and improper usage should be avoided for safety reasons.

Important Technical Specifications

Material:

All external parts are resistant to transformer oils, salt fog, and UV rays.
Dial: Tempered glass / Polycarbonate.
Standard color: RAL 7032.

Environmental Conditions:

Ambient temperature: -40°C up to +80°C.
Oil temperature: -40°C up to +120°C.
Degree of protection: IP66 according to EN60529.
Maximum altitude: 2000 m.
Maximum humidity: 80%.
Pollution level: Grade III.

Cable Glands and Wires:

Standard cable gland: 1xM25x1.5 for Comem eViewer, 3xM25x1.5 for Comem eOLI - Comem eOLI22.
Wires: Max 2.5mm² - advised 4x1mm² or 6x1mm² shielded twisted pair cable.

Electronic Board Features (eOLI/eOLI22):

Power supply (terminals 1-2): 24 Vdc ±10% polarized.
Power consumption: 1.5 W.
Analogical output (terminals 6-7): 4-20 mA (dielectric strength between electronic card and analogical output: 2kV).
- Maximum resistance: 450 Ω.
- Accuracy: 2.5% of full scale.
- Distance for analogical output: Max 30 m / 98 ft (for different demands contact ABB).
Digital output (terminals 3-4): Serial RS485 Modbus RTU (for more information contact ABB).
- Distance for digital output: Max 30 m / 98 ft (for different demands contact ABB).
Ventilation Valve: n.1 to prevent the formation of condensation.

Electronic Board Features (Comem eViewer only):

Power supply (terminals 1-2): 24 Vdc ±10% polarized.
Analogical input (terminals 3-4): 4-20 mA.
Distance for analogical input: Max 30 m / 98 ft (for different demands contact ABB).
Ventilation Valve: n.1 to prevent the formation of condensation.

Breaking and Making Capacity:

Voltage: 24V DC to 220V DC
- Uninterrupted current (making capacity): 2A
- Interrupted current (breaking capacity): 100mA (L/R < 40)
Voltage: 230 VCA
- Uninterrupted current (making capacity): 2A
- Interrupted current (breaking capacity): 2A (cosφ > 0.5)

Usage Features

Installation:

Comem eOLI/eOLI22: The arm with the float is inserted through a machined hole on the conservator. An O-ring is placed in the slot behind the gauge. The flange is aligned with threaded pins or holes (depending on the conservator flange type) and secured using four M4x12 screws. The oil level indicator flange is assembled using specific washers and nuts/screws as detailed in the tables.
Comem eViewer: The transformer must have a dedicated place for the eViewer. Connection can be made via threaded pin and nut M6 or screws M6.

Modbus Communication Parameters (for eOLI/eOLI22):

Speed of data transmission (baud rate): 9600 bits/s.
Data bits (number of bits): 8.
Parity bit: None.
Stop bit: 1.

Electrical Connection:

Micro Switch Wiring: Electrical cables are wired according to the ordered model and the provided electrical scheme (Diagram K, Y, X, W).
Analog Output and Modbus Communication Wiring (eOLI/eOLI22):
- Power Voltage: Connect 24 Vdc ±10% polarized power to terminals 1-2.
- Analog Output: Terminals 6-7 provide 4-20 mA output. 4 mA corresponds to the minimum arrow position (0%), and 20 mA to the maximum arrow position (100%).
- Modbus Communication: Digital output RS485 uses terminals 3-4. Refer to the complete manual for Modbus register and address information.
Comem eViewer Wiring:
- Power Voltage: Connect 24 Vdc ±10% polarized power to terminals 1-2.
- Analog Input: Connect the analog signal (4-20 mA) from the eOLI/eOLI22 to terminals 6-7 of the eViewer. Negative eViewer (3) connects to negative eOLI (7), and positive eViewer (4) connects to positive eOLI (6).

Micro-switches Operation:

The electrical micro-switches operate at an advance angle ≤5° with respect to the min or max indications of the oil level in the conservator. If there is a double contact (e.g., double MIN and/or double MAX), the second contact operates approximately 5° after the first contact.

Maintenance Features

Troubleshooting:

The manual provides a troubleshooting guide for common issues:

eOLI/eOLI22 not providing 4-20mA/Modbus output: Check if the eDevice is properly fed with 24 VDC between terminals 1 (-) and 2 (-). Blue LEDs (one fixed and one blinking) should be powered on.
Not possible to read Modbus output on eOLI/eOLI22: If the eDevice is properly powered on, check the Modbus ID and register number.
Pointer on the dial is always at the lowest position: Check that the floating element is not damaged.
eViewer does not indicate any value even if connected to the eOLI/eOLI22: Check the polarity connection of the 4-20mA terminals.

For further information or specific support, users are directed to consult the complete manual instruction or contact ABB at IT-support.comem@abb.com.