34 – EN ABB Motors and Generators |
3GZF500730-70 rev. C RU-EN 01-2016
Unused cable entries must be closed with blanking
elements according to the protection and IP class of the
terminal box.
The degree of protection and diameter are specified in the
documents relating to the cable gland.
WARNING
Use appropriate cable glands and seals in the cable
entries according to the protection type and the type
and diameter of the cable.
Earthing must be carried out according to local regulations
before the machine is connected to the supply voltage.
The earth terminal on the frame has to be connected to
PE (protective earth) with a cable as shown in Table 5 of
GOST/ IEC 60034-1:
Minimum cross-sectional area for protective conductors
Cross-sectional area of phase
conductors of the installation,
S, mm
2
Minimum cross-sectional area of the
corresponding protective conductor,
S
P
, mm
2
4
6
10
16
25
35
50
70
95
120
150
185
240
300
400
4
6
10
16
25
25
25
35
50
70
70
95
120
150
185
In addition, earthing or bonding connection facilities on the
outside of an electrical apparatus must provide an effective
connection of a conductor with a cross-sectional area of
at least 4 mm
2
.
The cable connection between the network and motor
terminals must meet the requirements stated in the
national standards or regulations for installation, or in the
standard GOST/IEC 60204-1 according to the rated
current indicated on the rating plate.
NOTE!
When the ambient temperature e50 °C,
cables having a permissible operating temperature
of +90 °C as minimum shall be used. Also all other
conversion factors depending on the installation
conditions shall be taken into account while sizing
the cables.
Ensure that the motor protection corresponds to the
environment and weather conditions.
The seals of terminal boxes (other than Ex d) must be
placed correctly in the slots provided, to ensure the
correct IP class. A leak could lead to penetration of dust or
water, creating a risk of flashover to live elements. If seals
or gaskets are replaced, original sealing solution materials
must be used.
4.9.1 Flameproof motors
There are two different types of protection for the terminal
box:
− Ex d for M3JP and M3JM-motors
− Ex e for M3KP and M3KM-motors
1Ex d Gb/Mb motors M3JP and M3JM
Certain cable glands are approved for a maximum amount
of free space in the terminal box. The amount of free
space for the motor range and the number and type of
gland threads are listed below.
Motor type
M3JP /
M3JM
Pole
number
Terminal
box
type
Threaded
holes
Terminal
box
free
volume
Cover
bolt
size
Tightening
torque of
terminal
box bolts
80 – 90
2 – 8
25
1xM25
1.0 dm
3
M8
23 Nm
100 – 132
2 – 8
25
2xM32
1.0 dm
3
M8
23 Nm
160 – 180
2 – 8
63
2xM40
4.0 dm
3
M10
46 Nm
200 – 250
2 – 8
160
2xM50
10.5 dm
3
M10
46 Nm
280
2 – 8
210
2xM63
24 dm
3
M8
23 Nm
315
2 – 8
370
2xM75
24 dm
3
M8
23 Nm
355
2 – 8
750
2xM75
79 dm
3
M12
80 Nm
400 – 450
2 – 8
750
2xM75
79 dm
3
M12
80 Nm
Auxiliary cable entries
Motor type
Pole number
Threaded holes
80 – 132
2 – 8
1xM20
160 – 450
2 – 8
2xM20
When closing the terminal box cover ensure that no dust
has settled on the surface gaps. Clean and grease the sur-
face with non-hardening contacting grease.
WARNING
Do not open the motor or the terminal box while the
motor is still warm and energized when an explosive
atmosphere is present.
1Ex de Gb/Mb; M3KP and M3KM
The letter ‘e’ or ‘box Ex e’ is shown on the terminal box
cover.
Ensure that assembly of the terminal connection is carried
out precisely in the order described in the connection
instructions, which are found inside the terminal box.
The creepage distance and clearance must conform to
GOST 316107-2012/IEC 60079-7.
4.9.2 Dust ignition protection motors Ex t
As standard, motors have the terminal box fitted on the
top with a cable entry possible from both sides. A full
description is contained in the product catalogs.
Pay special attention to the sealing of the terminal box and
cables to prevent the access of combustible dust into the
terminal box. It is important to check that the external
sealing is in good condition and well placed because they
can be damaged or moved during handling.
Summary of Contents for M2A series
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