Motors With Drain Plugs For Condensation; Cabling And Electrical Connections; Flameproof Motors - ABB M2A Manual De Instalación E Usuario

3.7 Motors with drain plugs for
condensation
Check that drain holes and plugs face downwards.
Non-sparking & Increased safety motors
Motors with sealable plastic drain plugs are delivered with
these in the closed position in aluminium motors and in the
open position in cast iron motors. In clean environments,
open the drain plugs before operating the motor. In very
dusty environments, all drain holes should be closed.

Flameproof motors

Drain plugs, if requested, are located at the lower part of
the end shields in order to allow condensation to escape
from the motor. Turn the knurled head of the plug to check
free operation.
Dust Ignition Protection Motors
The drain holes must be closed on all dust ignition protec-
tion motors.
3.8 Cabling and electrical
connections
The terminal box on standard single speed motors nor-
mally contains six winding terminals and at least one earth
terminal.
In addition to the main winding and earthing terminals, the
terminal box can also contain connections for thermistors,
heating elements or other auxiliary devices.
Suitable cable lugs must be used for the connection of all
main cables. Cables for auxiliaries can be connected into
their terminal blocks as such.
Motors are intended for fixed installation only. If not other-
wise specified, cable entry threads are metric. The protec-
tion class and the IP-class of the cable gland must be at
least the same as those of the terminal boxes.
Ensure only certified cable glands for increased safety and
flameproof motors are used. For non-sparking motors,
cable glands must comply with EN 60079-0.
NOTE!
Cables should be mechanically protected and clamped
close to the terminal box to fulfill the appropriate re-
quirements of EN 60079-0 and local installation stand-
ards (e.g. NFC 15100).
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
EN 60079-0:
Minimum cross-sectional area of protective conductors
Cross-sectional area of phase
conductors of the installation,
S, mm
2
S ≤ 16
16 < S ≤ 35
S > 35
In addition, earthing or bonding connection facilities on the
outside of electrical apparatus must provide effective
connection of a conductor with a cross-sectional area of
at least 4 mm2.
The cable connection between the network and motor
terminals must fulfill the requirements stated in the national
standards for installation or in the standard EN 60204-1
according to the rated current indicated on the rating
plate.
Ensure that the motor protection corresponds to the
environment and weather conditions; for example, make
sure that water cannot enter the motor or the terminal
boxes.
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.
3.8.1 Flameproof motors
There are two different types of protection for the terminal
box:
– Ex d for M2JA/M3JP-motors
– Ex de for M2KA/M3KP-motors
Ex d-motors; M2JA/M3JP
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 is listed below.
Motor type Terminal box
M2JA 80-400 free volume
80 - 132 1.45 - 1.7 dm
160 - 180 3 dm
3
200 - 250 8.5 dm
280 - 315 15 dm
355 - 400 79 dm
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.
Low voltage Ex motor manual 01-2007 | ABB Motors and Generators EN – 9
Minimum cross-sectional area of the
corresponding protective conductor,
S , mm
2
P
S
16
0.5 S
Motor type Terminal box
M3JP free volume
80 -132 1.0 dm
3
160 - 180 5.2 dm
200 - 250 10.5 dm
3
280 - 315 24 dm
3
355 - 400 79 dm
3
3
3
3
3
3