Insulation Resistance Check; Foundation; Balancing And Fi Tting Coupling Halves And Pulleys; Mounting And Alignment Of The Motor - ABB M3H Serie Manual De Instalación, Funcionamiento, Mantenimiento Y Seguridad

3.2 Insulation resistance check

Measure insulation resistance before commissioning
and when winding dampness is suspected.
WARNING
Disconnect and lock out before working on
the motor or the driven equipment. Ensure no
explosive atmosphere is present while executing
insulation resistance check procedures.
Insulation resistance, corrected to 25°C, must exceed
the reference value, i.e. 100 MΩ (measured with 500 or
1000 V DC). The insulation resistance value is halved
for each 20°C rise in ambient temperature.
WARNING
The motor frame must be grounded and the
windings should be discharged against the frame
immediately after each measurement to avoid risk
of electrical shock.
If the reference resistance value is not attained, the
winding is too damp and must be oven dried. The oven
temperature should be 90°C for 12-16 hours followed
by 105°C for 6-8 hours.
Drain hole plugs, if fi tted, must be removed and closing
valves, if fi tted, must be opened during heating. After
heating, make sure the plugs are refi tted. Even if the
drain plugs are fi tted, it is recommended to disassemble
the end shields and terminal box covers for the drying
process.
Windings drenched in seawater normally need to be
rewound.

3.3 Foundation

The end user has full responsibility for preparation of
the foundation.
Metal foundations should be painted to avoid corrosion.
Foundations must be even, and suffi ciently rigid to
withstand possible short circuit forces. They must be
designed and dimensioned to avoid the transfer of
vibration to the motor and vibration caused by reso-
nance.
3.4 Balancing and fi tting
coupling halves and pulleys
As standard, balancing of the motor has been carried
out using half key, and the shaft is marked with RED
tape, with the text "Balanced with half key".
When balancing with full key, the shaft is marked with
YELLOW tape, with the text "Balanced with full key".
In case of balancing without key, the shaft is marked
with BLUE tape, with the text "Balanced without key".
EN – 8
Coupling halves or pulleys must be balanced after
machining the keyways. Balancing must be done in
accordance with the balancing method specifi ed for the
motor.
Coupling halves and pulleys must be fi tted on the shaft
by using suitable equipment and tools which do not
damage the bearings and seals.
Never fi t a coupling half or pulley by hammering or by
removing it using a lever pressed against the body of
the motor.
3.5 Mounting and alignment of
the motor
Ensure that there is enough space for free airfl ow
around the motor. Minimum requirements for free space
behind the motor fan cover can be found from the
product catalog or from the dimension drawings avail-
able from the Web: see www.abb.com/motors&drives.
Correct alignment is essential to avoid bearing failures,
vibration and shaft and coupling damage.
Mount the motor on the foundation using the appropri-
ate bolts or studs and place shim plates between the
foundation and the feet.
Align the motor using appropriate methods.
If applicable, drill locating holes and fi x the locating pins
into position.
Mounting accuracy of coupling half: check that clear-
ance b is less than 0.05 mm and that the difference a1
to a2 is also less than 0.05 mm. See Figure 3.
Re-check the alignment after fi nal tightening of the bolts
or studs.
Do not exceed permissible loading values for bearings
as stated in the product catalogs.

3.6 Slide rails and belt drives

Fasten the motor to the slide rails as shown in Figure 2.
Place the slide rails horizontally on the same level.
Check that the motor shaft is parallel with the drive
shaft.
Belts must be tensioned according to the instructions of
the supplier of the driven equipment. However, do not
exceed the maximum belt forces (i.e. radial bearing
loading) stated in the relevant product catalogs.
WARNING
Excessive belt tension will damage bearings and
can cause shaft breakage. For Ex d and Ex de-
motors excessive belt tension may even cause
danger by eventual mutual contact of the fl ame-
path parts.
ABB/Low Voltage Motors/ Ex manual 01-2007