12
Maintenance and service guide - LSPX-FLSPX ZONE
21 - Ex tb – LSES-FLSES ZONE
22 - Ex tc
5725 en - 2020.02 / c
7 - SPECIAL OPERATING CONDITIONS
- Installation zones
Our motors offer an IP 65 (or IP 55-zone 22) degree of protection
and we guarantee their surface temperature. They are intended
for use in dusty explosive atmospheres of group II - Category
2 (IP 65-zone 21) or Category 3 (IP 55-zone 22).
- Employee safety
Protect all rotating devices before power-up.
If a motor is started up without a coupling device having been
fitted, carefully immobilize the key in its housing.
All measures must be taken to provide protection against risks
associated with rotation of components (sleeve, pulley, belts
etc.).
Beware of backdriving when the motor is switched off.
Appropriate precautions must be taken:
- pumps, install a non-return valve, for example.
- Thermal protection (see § 6 & 8)
Motors for difficult starting conditions or with frequent starting
must be equipped with thermal protection.
- Heaters (see § 6)
Heaters must only be in service when the motor is stopped and
cold. Recommended for use when ambient temperatures ≤
20°C. In all cases the power dissipated must ensure that the
temperature classification of the motor is observed.
- Temperatures: storage and ambient
Note: T
a
= ambient temperatures
If the motor has been stored at a temperature below -10 °C,
heat the motor (see § 3) and turn the shaft by hand before
operating the machine.
If the motor is to be used at a temperature lower than -25 °C, it
must not be fitted with a sensor. It can be fitted with
thermocouples.
As standard construction, our motors are designed to operate
at temperatures between -20 °C and 40 °C.
If T
a
< -25 °C, shaft passage seals must be made of silicone and
the fan made of metal.
If T
a
< -25 °C or (and) if 50 °C < T
a
≤ 60 °C, terminal box face
seals must be made of silicone.
- Surface temperature
As standard, the maximum surface temperature of our motors
is 125 °C with a maximum ambient temperature ≤ 40 °C.
Without adaptation of the motor the maximum surface
temperature will be:
• 135 °C if 40 °C ≤ T
a
≤ 50 °C
• 145 °C if 50 °C ≤ T
a
≤ 60 °C
- Connection
Particular attention must be paid to the information on the
nameplate in order to choose the correct type of connection for
the supply voltage.
When motors are equipped with one or more auxiliary
connection boxes, it can only withstand a low risk of mechanical
damage, and users must provide additional protection if there
is a high risk.
Similarly the protection system and the supply cables (the
voltage drop during the starting phase must be less than 3%)
are to be selected according to the characteristics marked on
the nameplate.
- Earthing
The motor must be earthed in accordance with the applicable
regulations (protection of workers).
An external terminal on the frame is used for effective earth
connection of equipotential links. This terminal must be
prevented from working itself loose.
- Leak tightness
Monitor the condition of all seals and replace them periodically
if necessary (
Once a year at least for Ex tb motors
).
At the shaft passages, take care not to damage the seals in
contact with the keys and shoulders.
After removing drain plugs, refit them in place in order to ensure
the plated degree of protection of the motor. Replace the seals
that are removed using new seals with the same characteristics.
Clean the orifices and plugs before refitting them. Whenever
removed it is recommended that once a year (depending on
the application) you replace seals (shaft passages, bearing
housing recesses, terminal box cover etc.) using new seals
with the same characteristics after cleaning the components.
Shaft passage seals must be fitted using the same type of
grease as the bearings.
IP6X thread leak tightness (mandatory if Ex tb marking)
may be enhanced using grease.
- Shock resistance
The motor can withstand a low mechanical impact (IK 08
according to EN 50102). The user must provide additional
protection if there is a risk of significant mechanical shock.
Note: option IK 10 may be ordered.
- LEROY - SOMER “Digistart” electronic starter
This is micro-controlled multi-function electronic system,
which is used with all squirrel-cage asynchronous three-phase
motors.
It ensures smooth starting of the motor with:
- reduced starting current,
- smooth jerk-free acceleration achieved by controlling the
current in the motor.
After starting, the DIGISTART carries out additional motor
management functions in its other operating phases: steady
state and slowing.
- Models from 18 to 1600 A
- Power supply: 220 to 700 V - 50/60 Hz
The DIGISTART is low-cost to install, and only an additional
switch and fuses are required.
The “Digistart” electronic starter associated with the
motor must be installed outside the hazardous zone
(zones 20, 21, 22).
- Contactors - Main switches
Under all circumstances contactors, main switches etc. must
be installed and connected in a panel which offers a degree of
protection and a surface temperature compatible with the
installation zone, or outside the hazardous zone (zones 20, 21
and 22).
INSTALLATION AND MAINTENANCE - LSPX-FLSPX ZONE 21 - Ex tb – LSES-FLSES ZONE 22 - Ex tc
