Mechanical Installation; Electrical Connection - Nidec Leroy-Somer FLSD Ex db Serie Instalación Y Mantenimiento

3-phase induction motors for
en
ATMOSPHERES containing EXPLOSIVE
GASES or GAS and DUST

MECHANICAL INSTALLATION

• The motors are factory-fitted with guidance labels which must be left in place.
• Before commissioning, drain any condensation water from inside the motors (see § "Regular servicing").
• Monitor the state of all lip seals and change regularly when necessary (1 time per year minimum for Ex tb and Ex
tc motors). After any work involving dismantling the motor replace all the weatherproof seals with new seals after
cleaning the parts. Where the shaft crosses, make sure that the seals are not damaged on contact with the key
entries and shoulders.
• The bolting parts must be class 8.8 as per ISO 898, except for FLSD 90 LU and FLSD 112 MU where they must
be class 12.9. For temperatures below -40°C class 12.9 minimum on FLSD 90 and FLSD 100.
• For FLSD 315 IIC motors under amb. T° < -25°C, the bolting parts shall be class 12-9 minimum.
• The belts must be antistatic and flame-resistant.
• Protect the passage seals from light.

ELECTRICAL CONNECTION

• Unused cable or duct entries must be replaced by screwed plugs of a type approved or certified for the group, the
application (gas or/and dust) and temperature class corresponding to those of the unit's location as a minimum.
Their fitting shall comply with the instructions in their instruction manuals.
• The cable entry system must comply with one of the possibilities described in 60079-14§10.4.2 ; more
particularly "incorporating sealing compounds" for materials Ex db IIC.
• As opposed to the attached cable(s), the motor must either be connected outside an explosive atmosphere, or
be protected by a mode of protection adapted to the group, the application (gas or / and dust) and the temperature
class which correspond at least to those of the location of the appliance (see the indications on the motor
nameplate). The cables must be class C2 min. and/or with filler.
• The supply voltage and frequency must conform to those indicated on the motor nameplate.
• For motors supplied by mains supply: the tolerance is ±10% on the assigned voltage (1 single voltage assigned
per motor) and the frequency tolerance ±1%. Consult us for any other power supply conditions.
• For motors supplied by a drive: the tolerance is ±10% on the assigned voltage at the motor terminals. Refer to
the indications on the drive nameplate(s). The temperature rating was performed with IGBT drive, PWM
waveshape, min quench frequency = 3 kHz, open loop constant U/f. In the case of a drive with voltage drop and
continuous operation (1h min) in the 45-50 Hz frequency range, use T/Tn = 95 %.
• The choice of connecting cables must satisfy the installation rules dictated by the standards applicable to the
point of installation of the equipment, the current, voltage, length, temperature, "T.cable" (if present on the motor
nameplate).
• The connection must satisfy the installation rules dictated by the standards and the application of current
regulations and must be performed under the responsibility of a qualified person who must ensure:
- the conformity of the junction box (mode of protection Ex, IP, IK, etc.).
- the conformity of the connection to the terminal and the tightening torques.
- that the minimum clearances in the air imposed by the relevant standards are respected; for an Ex db eb junction
box (HA 160 à 355), from each terminal, position the cables so that their terminals are parallel to each other to
implement minimum isolation distances of 14 mm.
• The screws used to connect the cables must be the same type as the cable terminals (do not fit steel screws on
brass terminals, for example).
• Earthing of the main and any auxiliary motor is compulsory and must be performed in accordance with current
regulations.
• When the motor is fitted with auxiliary ventilation, this must be of a type certified by the group, the application (Gas or
Gas & Dust) and the temperature class must correspond at least to that of the main motor. The power supplies to the 2
motors must be connected so that the powering up of the main motor is subordinate to the powering up of the auxiliary
motor. Shutting down the auxiliary motor must also shut down the main motor. The installation must contain a
mechanism that prevents the main motor from operating if there is no ventilation.
• In S1 service, 3 successive start-ups from cold and 2 from hot are accepted for the machine. The maximum
number of start-ups within the same hour is 6. In frequent or difficult starting conditions, motors must be fitted with
thermal protection (consult us).
• To ensure that the maximum surface temperature is never reached, the thermal sensors fitted on the motor must
be connected to a device (in addition to and functionally independent of any system which could be required for
operational reasons in normal conditions) which switches off the motor.
• Space heaters (or low voltage A.C. or D.C. injection heating) should only be supplied with power when the
motor is switched off and cold; their use is recommended for an ambient temperature of < -20°C. The power
usage must always correspond to the temperature class of the motor.
• When fitting one or more vibration sensors or accessories (pulse generator for example) these should be
connected in a box. All of these accessories (as well as the box if it is not placed outside an explosive atmosphere)
must be of a type certified by the group, the application (Gas or Gas & Dust)) and the temperature class must
correspond at least to that of the motor. Their fitting shall comply with the instructions in their instruction manuals
and currently enforced regulations.
• In the following configurations, and whatever the shaft height, the motor must be fitted with thermal probes in the
winding, and from the 355 shaft height, one more on the front bearing.
- motor supplied by a separate frequency variator located outside the zone.
- fanless motor, used in a sufficient or possibly adapted air flow.
- motor fitted with an anti-reversing device.
• The bearings may be electrically insulated, the bearing type is indicated on the nameplate.
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