SIEMENS
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Siemens D 83.1 · 2016
2
Motors with Explosion Protection
LOHER CHEMSTAR and VARIO 1PS4 and 1PS5 motor series
General information
■
Technical specifications
(continued)
Enclosure and ventilation
Enclosure and fan for motors of the LOHER CHEMSTAR and VARIO 1PS4/1PS5 series
Protection against ingress of condensation
Condensation drainage holes must not be drilled into
encapsulated explosion-proof motors, otherwise the type of
protection can no longer be ensured. In frame size 250 and
above, the explosion-proof encapsulated motors have separate
chambers at the drive end (DE) and non-drive end (NDE) for
collection of any condensation that may arise. This prevents
possible damage to the winding as a result of condensation in
the winding overhang spaces. In the case of smaller motors
(frame size range 71 to 225), the risk of adverse effects from
condensation is countered by applying increased humidity
protection to the winding insulation.
In the standard version, the motor can be used in environments
with up to 80 % relative humidity without the need for further
measures. If the motor is ordered with the option "Increased
tropicalization, humidity
80 % (order code
W61
), the hollow
spaces and internal parts can be finished with special paint,
which enables operation at up to 100 % humidity to be achieved
as an option. In the CHEMSTAR motor series, an anti-
condensation heater is not necessary in most cases.
This is known as a "tropical insulation version".
Explosion-proof three-phase motors in type of protection Ex d
for ambient temperatures down to -55 °C
Motors of the 1PS4/1PS5 series can also be designed for
hazardous areas with ambient temperatures down to -55 °C.
Frame size
Enclosure
Bearing plates
Fan cover
Fan
Material
Design of
enclosure feet
1)
Surface
Material
Flange ring
on bearing plate
Material
LOHER CHEMSTAR
71
Cast-iron
Cast
With cooling fins
Cast-iron
Screwed on
Sheet steel
Plastic
3)
80 … 112
Cast,
optionally
screwed on
132
Cast
2)
160
Screwed on
180 … 280
Screwed on
315
Metal
3)
355
Cast
Metal
3) 4)
LOHER VARIO
355 … 450
Steel
Welded
With cooling fins
Cast-iron
–
Sheet steel
Metal
4)
500
Steel,
bearing hub in
cast iron
1)
For designs with feet only.
2)
Terminal boxes are screwed on at the side on frame sizes 132 and 160.
3)
With specific operating conditions, the external fans can be constructed
with special materials (see special versions).
4)
Only one direction of rotation for 2-pole and 4-pole version.
Advantages
The motors can be used in hazardous
areas at ambient temperatures down to
-55 °C without the need for expensive
additional heating. This saves on
expensive switching and monitoring
devices, the associated cables and
leads, as well as heating energy.
Explosion protection
According to European standards
EN 60079-0, EN 60079-1, EN 60079-7
Marking
II 2G Ex de IIB T3-6 Gb or
II 2G Ex de IIC T3-6 Gb
Certifications
EU type examination certificate
Ambient temperature range
-55 to +60 °C
Type series
CHEMSTAR and VARIO 1PS4/1PS5
motors
Rated voltage
U
rated
Up to 690 V
Design
Selection of materials for temperatures
down to -55 °C
Group IIC or IIB
Optional version possible
Motors with built-on components,
such as brakes and speed encoders,
cannot be supplied for ambient
temperatures down to -55 °C.
Note
The fan must not be blocked by ice or
snow.
© Siemens AG 2016