Electric motors for explosive atmospheres | 3
1. INTRODUCTION
The installation, operation and maintenance of the motor must be always performed by qualified and authorized personnel using proper
tools and methods and following the instructions contained in the documents supplied with the motor.
The instructions presented in this document are valid for WEG motors with the following characteristics:
g
Three-phase and single-phase induction motors (squirrel cage rotor);
g
Three-phase permanent magnet motors;
g
Three-phase hybrid motors (squirrel cage rotor + permanent magnets);
These motors can be used in hazardous areas with the following types of protection:
g
Increased Safety – “Ex e”;
g
Type of protection “n” - “Ex n”;
g
Flameproof enclosure - “Ex d” or “Ex de”;
g
Protection by Enclosure (combustible dust) - “Ex t”;
g
Class I Division 1;
g
Class I Division 2;
g
Class II Division 1;
g
Class II Division 2.
Details of motor marking may be found on nameplate and product certification, which is part of the motor documentation. For reference, this manual
lists the certificate numbers for each type of protection and their nameplate markings. Furthermore, the applicable Standards may be found in
the product certification and at the “Installation, Operation and Maintenance Manual of Electric Motors for Use in Explosive Atmospheres” - code
50034162. This manual is available in the website
www.weg.net
.
The objective of this manual is to provide important information, which must be considered during the shipment, storage, installation, operation and
maintenance of WEG motors. Therefore, we advise to make a careful and detailed reading of the instructions contained herein before performing any
intervention on the motor. The noncompliance with the instructions informed in this manual and others mentioned in the website
www.weg.net
voids
the product warranty and may compromise the type of protection of the motor and still result in serious personal injuries and material damages.
Any component added to the motor by the user, for example, cable glands, thread plug, encoder, etc., must meet the type of
protection of the enclosure, the “equipment protection levels” (EPL) and the degree of protection of the motor, according to the
Standards indicated in the product certification.
Special Conditions for Safe Use
The sign “X” added to the certificate number, informed on the nameplate of the motor, indicates that the equipment demands
special conditions for installation, operation and/or maintenance, being those described in the certificate and the motor
documentation.
For reference, the chapter Certificates lists the certificate numbers for each type of protection and their nameplate markings.
The noncompliance with these requirements compromises the safety of the product and of the installation.
The correct classification of the installation area and ambient characteristics is user’s responsibility.
Electric motors have energized circuits and exposed rotating parts which may cause injuries to people.
2. SHIPMENT, STORAGE AND HANDLING
Check the conditions of the motor right after receiving. When any damage is noticed, this must be reported in writing to the transportation company,
and immediately communicated to the insurance company and to WEG. In this case, no installation job can be started before the detected problem
has been solved.
Check if the nameplate data match the invoice data, the environment conditions where the motor will be installed, the type of protection and EPL of
the motor. If the motor is not immediately installed, it must be stored in a clean and dry room protected against dust, vibrations, gases and corrosive
agents, with relative humidity not over 60%.
In order to prevent water condensation within the motor during the storage period, it is recommended to keep the space heater ON (if available). In
order to prevent oxidation of the bearings and ensure an even distribution of the lubricant, rotate the motor shaft at least once a month (at least five
turns), always leaving it in a different position. For bearings with oil mist lubrication systems, the motor must be stored horizontally with ISO VG 68
oil in the bearing, with the amount indicated in the motor manual available in the website and the shaft must be turned every week. If the motors
are stored for more than two years, it is recommended to change the bearings, or to remove, wash, inspect and relubricate them before the motor
is started. After this storage period, it is also recommended to change the start capacitors of single-phase motors since they loss their operating
characteristics.
Handle the motor always carefully in order to prevent impacts and damages to the bearings and always install the shaft
transportation/locking device (if supplied) when transporting the motor.
Use only the eyebolts to lift the motor. However these eyebolts are designed for the motor weight only. Thus never use these
eyebolts to lift the motor with additional loads coupled to it. The lifting eyebolts of the terminal box, fan cover, etc., are intended to handle
only these parts when disassembled from the motor.
Periodically and mainly before the initial star-up, measure the insulation resistance of the motor winding. Check the recommended values and the
measuring procedures in the website.
3. INSTALLATION
During the installation, the motors must be protected against accidental energization.
Check the motor direction of rotation, turning it without load before it is coupled to the load.
Remove the transportation devices and shaft locking device (if supplied) before starting the motor installation.
Motors must be only installed in places compatible with their mounting features and in applications and environments for which they are intended. It must be respected the
type of protection and the EPL of the motor, according to the classification of the area where the motor will be installed.
The motors with feet must be installed on bases duly planned in order to prevent vibrations and assure perfect alignment. The motor shaft must be properly aligned with
the shaft of the driven machine. Incorrect alignment, as well as improper belt tension, will certainly damage the bearings, resulting in excessive vibrations and even causing
the shaft rupture. The admissible shaft radial and axial loads indicated in the general manual of the website must be respected. Use flexible coupling whenever possible.
When motors are fitted with oil lubricated bearings or oil mist lubrication systems, connect the cooling and lubrication tubes (where provided).
For oil lubricated bearings, the oil level must be in the center of the sight glass.
Only remove the corrosion protection grease from the shaft end and flange immediately before the motor installation.
Unless specified otherwise in the purchase order, WEG motors are dynamically balanced with “half key” and without load (uncoupled). The driving elements, such as
pulleys, couplings, etc., must be balanced with “half key” before they are mounted on the shaft of the motors.
The motor must always be positioned so the drain hole is at the lowest position.
"Open/closed" rubber drain plugs are delivered in closed position and must be opened periodically to allow the drainage of the
condensed water. For environments with high water condensation levels and motor with degree of protection IP55, the drain plugs can be
mounted in open position.
ENGLISH
