Bearing Insulation; Explosion Proof Motor Checking And Maintenance; Explosion Proof Motor Repairs; Warranty Terms - WEG Ex d Manual De Instalación, Operación Y Mantenimiento

3.2.2 BEARING INSULATION

For "Ex d" and "Ex de" motors, on frames 315S/M and 355M/L* when used with VFD's must use insulated
bearings.
(*) Other frame sizes under request.
IF RECOMMENDATIONS AND CRITERIA OF ITEM 3 ARE NOT FOLLOWED ACCORDINGLY, MOTOR
WARRANTY WILL BE VOID.

4 EXPlosIon PRooF MoToR CHECKInG anD MaInTEnanCE

Checking and the maintenance procedures for "Ex" motors are described by EN / IEC 60079-17 Standard,
particularly:
- Electric connections must be correctly locked to avoid resistance-increases, with consequent contact
overheating.
- The insulation air-distance and the surface-distance between conductors, required by Standards, must be
respected.
- All screws used to assemble motor parts and terminal box, must be completely fastened.
- The replacement of seals and components for cable inlet must be made using spare parts, supplied by
the manufacturer in order to guarantee original type of protection.
- "Ex" joint surfaces can not be machined and it is not allowed to insert any kind of seals between them, not
foreseen or supplied by the manufacturer. Joint surfaces need to be cleaned and greased with a thin coat of
silicon grease (or a similar product) to avoid corrosion or water entry.

5 EXPlosIon PRooF MoToR REPaIRs

Repair procedures of "Ex" motors are described by EN / IEC 60079-19 Standard. With the necessity of a
repair, it must be done at the manufacturer's facilities or on a repair shop authorized, certified and qualified
by WEG according ATEX and IEC procedures. The procedures are described on WEG ATEX and IEC
manual for potentially explosive atmosphere equipment.
WEG will have no obligation or liability for defects/damage caused by people/repair shop that does not fit
on the description above.

6 WaRRanTY TERMs

WEG warrants its products against defects in workmanship and materials for eighteen (18) months from the
invoice date issued by the factory, authorized distributor or agent limited to twenty four (24) months from
manufacturing date independent of installation date as long as the following items are fulfilled accordingly:
- Proper transportation, handling and storage;
- Correct installation based on the specified environmental conditions;
- Operation under motor capacity limits;
- Observation of the periodical maintenance services;
- Repair and/or replacement effected only by personnel duly authorized in writing by WEG;
- The failed product must be available to the supplier and/or repair shop for a required period
to detect the cause of the failure and to carry out
the corresponding repair;
- Immediate notice by the purchaser about failures occurred and that these are accepted by WEG as
manufacturing defects.
This warranty does not include disassembly services at the purchaser facilities, transportation costs
with product, tickets, accommodation and meals for technical service personnel when requested by the
customer.
12 | INDUCTION MOTORS FOR HAZARDOUS AREAS - English -