Maintenance of smoke extraction motors

LSHT - FLSHT

Reference: 4413 en - 2018.10 / c

Good practice guide

33Good practice guide - Maintenance of smoke extraction motors4413 en - 2018.10 / c

MAINTENANCE OF SMOKE EXTRACTION MOTORS

TEMPERATURE LEVELS AND MINIMUM OPERATING TIME

LSHT range

250°C 120’

300°C 120’

Manufactured by GP & Mansle

FLSHT range

400°C 120’

Manufactured by GP, Mansle & CEB

WHY USE SMOKE EXTRACTION MOTORS?• Smoke and heat extraction systems create a smoke-

free layer above the ground by clearing the smoke and thus improve the conditions for safe evacuation and/or rescue of people and animals, and allow the fire to be attacked while still in its early stages. They also remove the hot gases released by the fire in its full expansion phase.

• Their efficacy is well proven in assisting the evacua-tion of occupants of buildings, limiting fire damage by preventing the accumulation of smoke, making it easier to attack the fire, reducing the temperature of roofs and preventing the fire spreading sideways.

• To be sure of these beneficial effects, it is essential that smoke and heat extraction equipment operates relia-bly each time it is used during its service life on a site.

REWINDING SMOKE EXTRACTION MOTORSComponents such as insulation, varnish, wires, are components with specific characteristics and must conform to the motor originally approved by an official laboratory, and certified by an approved body.

The impregnation system is special.

REWINDING IS PROHIBITED

Leroy-Somer cannot guarantee the motor smoke ex-traction function after rewinding; this becomes the responsibility of the person carrying out the repair.

A DAMAGED STATOR MUST BE REPLACED WITH A NEW ONE

"DUAL PURPOSE" MOTOROption of adding a PTC sensor designed to protect the motor at 140°(when operating in comfort duty)

WARNING!

The sensors must be deactivated when the smoke extraction function is used.An automatic shut-off system should therefore be provided.

The maintenance and repair of smoke extraction motors maintains these motors at their original safety level, because correct operation of smoke extraction motors is VITAL.

MOTORS CONCERNEDSAFETY / SMOKE EXTRACTION

Power supply Ranges Power ratings Frame sizeAC / 3 ph LSHT 0.5 to 160 kw 80 to 315 mm

AC / 3 ph FLSHT 0.55 to 675 kw 80 to 450 mm

COMPLIANCE with EUROPEAN STANDARD EN 12101-3The reference standard in the smoke extraction worldINTERNATIONAL STANDARD: ISO 21927-3

4 Good practice guide - Maintenance of smoke extraction motors4413 en - 2018.10 / c

SERVICE INSPECTION EVERY 12 MONTHS:• check of insulation resistance (R > 10 MΩ) (under

500 V in direct current); if R < 10 MΩ, stove the stator and check insulation resistance or change the stator if the fault subsists;

• open the drain holes to remove any condensate build-up, then plug them to guarantee the protection rating indicated on the motor nameplate;

• ensure there is no dust or grease in the cooling circuit (eliminate all obstacles to proper motor cooling);

• check the state of the power supply cables;• check the fastening of any accessories;• check the condition of the lip seals.

For motors fitted with bearings with grease nipples, top up grease if required as indicated on the nameplate (grade, quantity of grease and interval), or grease every 2 years. Change the bearings every 3 years.

After 40,000 hours operation or 10 years since instal-lation, changing the complete motor is highly recom-mended.• At each disassembly, replace the gaskets at the shaft

passages, bearing connections (for IP56/65/66), cover and body of the terminal box, cable gland hold-er or cable glands, with new gaskets of the same type after cleaning the parts. Grease the gaskets at the shaft passages.

REGULAR SERVICE INSPECTIONUse for smoke extraction only• It is recommended to run motors positioned horizon-

tally for at least 1 hour every month and 15 minutes every 15 days for motors positioned vertically.

• For maintenance, refer to the requirements described in paragraphs 1.1 to 1.3 of the manual (Specific rec-ommendations for commissioning and servicing ref. 3585).

CHECKSIf maintenance involves dismantling, a dimensional and geometric check of the "bearing cages" and "stator spigot" diameters should be performed (see manufacturer data).

TIGHTENING THE SCREWS AND TIE RODSEnsure compliance with tightening torques (see manu-facturer data).

PAINTThe motor should be sandblasted prior to being painted.The paint used is RAL 9006 (grey):• standard: Polyurethane Vinyl (PIN009PV102)• option: Epoxy (PIN008EP039)Ask the manufacturer for the application instructions (number of coats, etc.).

NAMEPLATE

IE2 / IE3

Motor type

Approval number

Electricalcharacteristics

Product classification

Dual purpose

Approved body

MAINTENANCE OF SMOKE EXTRACTION MOTORS

55Good practice guide - Maintenance of smoke extraction motors4413 en - 2018.10 / c

SUMMARY TABLE OF MOTOR SERVICE VISITS1) “DUAL PURPOSE” (comfort and smoke extraction)

2) “SMOKE EXTRACTION” / “STAND-BY” (smoke extraction only)

EVERY 12 MONTHS

- Check the insulation resistance- Drain any condensation water- Check that the motor is clean- Check the state of the power supply cables- Check that any accessories are fixed securely- Check the condition of the lip seals- Replace the seals on IP65 and IP66 motors

EVERY 40,000 HOURS OF OPERATION or EVERY 10 YEARSReplace the antifriction bearings and the stator or replace the whole motor

REGREASING OF OPEN BEARINGS- interval as specified on nameplate- in the case of special applications such as intermit-tent duty, humid atmosphere, etc., regreasing should be performed at least every two years

ONCE A MONTH- Run the motor for 1 hour

EVERY 12 MONTHS- Check the insulation resistance- Drain any condensation water- Check that the motor is clean- Check the state of the power supply cables- Check that any accessories are fixed securely- Check the condition of the lip seals

REGREASING OF OPEN BEARINGSRegreasing as per instructions on name plate

VERY IMPORTANT:

All parts to be changed should be replaced with original manufacturer spare parts.Specify the motor series number on the order.

VERY IMPORTANT:

If any incident occurs during operation (or possibly when stopped), the motor should be inspected immediately.Abnormal vibrations should be investigated immediately.

It is advisable to measure and monitor motor parameters such as current, noise and vibration levels, etc., and compare them with the initial settings so as to detect wear or possible malfunctions.

VERY IMPORTANT:

After operating in smoke extraction mode, the motors must be replaced.

MAINTENANCE OF SMOKE EXTRACTION MOTORS

6 Good practice guide - Maintenance of smoke extraction motors4413 en - 2018.10 / c

NOTES

77Good practice guide - Maintenance of smoke extraction motors4413 en - 2018.10 / c

NOTES

Moteurs Leroy-Somer SASHeadquarters: Boulevard Marcellin Leroy - CS 10015

16915 ANGOULÊME Cedex 9Limited company with capital of 65,800,512 €

RCS Angoulême 338 567 258www.leroy-somer.com