Grundfos MG 90SA4 User Manual

10. Service
Service must be carried out by qualified persons. All repairs must
be carried out in accordance with IEC 60079-19. Observe the
provisions of EN 50110-1 until all maintenance work has been
completed, and the motor has been assembled.
WARNING
Electric shock
Death or serious personal injury
‐ Before starting any work on the product, switch off the
power supply. Make sure that the power supply cannot
be accidentally switched on.
‐ Follow the wiring diagram located in the terminal box
cover.
‐ Do not connect the motor to the voltage supply until
the connection to earth has been carried out in accord-
ance with local regulations.
‐ Do not remove nor move the insulation material, if any,
present inside the terminal box.
‐ Before repairing or replacing the thermal switch or
thermistor, if any, make sure that the motor cannot re-
start automatically after cooling.
WARNING
Crushing of feet
Death or serious personal injury
‐ Wear personal protective equipment and attach lifting
equipment to the motor eyebolts when handling the
product.
‐ Keep other persons at a safe distance when handling
the product.
CAUTION
Crushing of feet
Minor or moderate personal injury
‐ Make sure that the eyebolts are secured in position.
WARNING
Body injury
Death or serious personal injury
‐ After assembling the motor, make sure that there are
no loose objects, for example near the ventilator or un-
der the fan cover, which could be ejected when start-
ing the motor.
‐ After assembling the motor, if you test the motor with-
out any device fitted to it, make sure that the key is se-
cured in the shaft keyway, so that it cannot be ejected
when starting the motor.
CAUTION
Hot surface
Minor or moderate personal injury
‐ Wear personal protective equipment.
10.1 Motor
Inspect the motor at regular intervals, determined by the
environment in which the motor is installed. To ensure adequate
ventilation, it is important to keep the motor clean. If the motor is
installed in a dusty environment, it must be cleaned and checked
more often than if it is installed in a non-dusty environment.
In standard motors, condensed water cannot escape. The drain
hole at the lowest point of the motor can be opened and ensure the
escape of water entering the stator housing, for example in
connection with condensation.
10.2
Motor bearings
Take care when replacing the motor bearings.
WARNING
Electric shock
Death or serious personal injury
‐ Do not remove nor move the insulation material, if any,
present inside the motor.
Do not expose the bearings to impacts or shocks.
10.2.1 Motors without lubricating nipples
The bearings are greased for life. The expected life is at least
18000 operating hours at an ambient temperature of up to 40 °C. A
higher ambient temperature reduces life. A temperature increase of
10 °C reduces life by 50 %.
Bearing grease
The technical specifications of the grease must correspond to DIN
51825, K3N or better.
• 50 cSt (mm
2
/s) at 40 °C
• 8 cSt (mm
2
/s) at 100 °C.
Grease filling rate: 30-40 %.
10.2.2 Motors with lubricating nipples
Lubricate the bearings with high-temperature grease as specified
on the motor nameplate with mechanical data.
Lubricating intervals are stated on the lubricating plate for 40 °C
and 60 °C.
We recommend dismantling the motor when the bearings have
been relubricated five times. Clean and check the bearings for
damage, and replace them if necessary.
In the case of seasonal operation (motor is idle for more than six
months of the year), we recommend lubricating the motor bearings
when you take the motor out of operation.
It is important to relubricate the bearings as specified on the motor
nameplate with mechanical data. If this interval is not observed, the
bearing life will be reduced.
Reduced lubricating interval
The lubricating interval must be reduced in these situations:
• Dirty and dusty environments. Reduce the lubricating interval by
a factor 0.75.
• Very moist environments. Reduce the lubricating interval by a
factor 0.9.
If the environments are both dusty and moist, multiply the factors.
Grease type and quantity
See the motor nameplate with mechanical data.
Never mix grease with thickeners, such as lithium-based
grease with polycarbamide-based grease.
10.3 Service documentation
Service documentation is available on www.grundfos.com >
Grundfos Product Center > Service.
If you have any questions, please contact the nearest Grundfos
company.
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English (GB)

Grundfos MG 90SA4 Specifications

General

Brand	Grundfos
Model	MG 90SA4
Category	Engine
Language	English