Insulation Resistance Check; Foundation; Balancing And Fitting Coupling Halves And Pulleys; Mounting And Alignment Of The Motor - ABB M2A Manual De Instalación E Usuario

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 wind-
ings should be discharged against the frame immedi-
ately after each measurement to avoid risk of electri-
cal shock.
If the reference resistance value is not attained, the wind-
ing is too damp and must be oven dried. The oven tem-
perature should be 90°C for 12-16 hours followed by
105°C for 6-8 hours.
Drain hole plugs, if fitted, must be removed and closing
valves, if fitted, must be opened during heating. After
heating, make sure the plugs are refitted. Even if the drain
plugs are fitted, 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 sufficiently rigid to with-
stand possible short circuit forces. They must be designed
and dimensioned to avoid the transfer of vibration to the
motor and vibration caused by resonance.
3.4 Balancing and fitting
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 YEL-
LOW 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".
8 – EN ABB Motors and Generators | Low voltage Ex motor manual 01-2007
Coupling halves or pulleys must be balanced after machin-
ing the keyways. Balancing must be done in accordance
with the balancing method specified for the motor.
Coupling halves and pulleys must be fitted on the shaft by
using suitable equipment and tools which do not damage
the bearings and seals.
Never fit 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 airflow 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 available 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 appropriate
bolts or studs and place shim plates between the founda-
tion and the feet.
Align the motor using appropriate methods.
If applicable, drill locating holes and fix the locating pins
into position.
Mounting accuracy of coupling half: check that clearance
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 final 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 flamepath parts.