Motors With Drain Plugs For Condensation; Cabling And Electrical Connections; Flameproof Motors - ABB ACS800 Serie Manuel D'installation

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
protection motors.
3.8 Cabling and electrical
connections
The terminal box on standard single speed motors
normally 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 fi xed installation only. If not
otherwise specifi ed, cable entry threads are metric. The
protection class and the IP-class of the cable gland
must be at least the same as those of the terminal
boxes.
Ensure only certifi ed cable glands for increased safety
and fl ameproof 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 fulfi ll the appro-
priate requirements of EN 60079-0 and local installa-
tion standards (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 specifi ed 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.
ABB/Low Voltage Motors/ Ex manual 01-2007
Earthing must be carried out according to local regula-
tions 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 effec-
tive connection of a conductor with a cross-sectional
area of at least 4 mm2.
The cable connection between the network and motor
terminals must fulfi ll 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 fl ashover 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 3
3
160 - 180 3 dm
3
200 - 250 8.5 dm
280 - 315 15 dm 3
355 - 400 79 dm 3
When closing the terminal box cover ensure that no
dust has settled on the surface gaps. Clean and grease
the surface 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.
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
3
160 - 180 5.2 dm
3
200 - 250 10.5 dm
280 - 315 24 dm 3
355 - 400 79 dm 3
9 – EN