Built-In Protection; Maintenance And Service; Contaminated Pumps - Grundfos SQ Instrucciones De Instalación Y Funcionamiento

7.3 Built-in protection

The motor incorporates an electronic unit which pro-
tects the motor in various situations.
In case of overload, the built-in overload protection
will stop the pump for 5 minutes. After that period,
the pump will attempt to restart.
If the pump is started and the borehole is empty, the
pump will stop after 30 seconds.
If the pump has been stopped as a result of dry run-
ning, it will start automatically after 5 minutes.
Resetting of the pump: Switch off the electricity sup-
ply for 1 minute.
The motor is protected in case of:
• dry running,
• voltage surges (up to 4000 V),
In areas with high lightning intensity, external
lightning protection is required.
• overvoltage,
• undervoltage,
• overload and
• overtemperature.
SQE pumps/MSE 3 motors:
Note: Via the CU 300 or CU 301, the dry-running
stop limit of the MSE 3 motors can be adjusted to
match the actual application.

8. Maintenance and service

The pumps are normally maintenance-free.
Deposits and wear may occur. For that purpose,
service kits and service tools are available from
GRUNDFOS. The GRUNDFOS Service Manual is
available on request.
The pumps can be serviced at a GRUNDFOS serv-
ice centre.

8.1 Contaminated pumps

Note: If a pump has been used for a liquid which is
injurious to health or toxic, the pump will be classi-
fied as contaminated.
If GRUNDFOS is requested to service the pump,
GRUNDFOS must be contacted with details about
the pumped liquid, etc. before the pump is returned
for service. Otherwise GRUNDFOS can refuse to
accept the pump for service.
However, any application for service (no matter to
whom it may be made) must include details about
the pumped liquid if the pump has been used for liq-
uids which are injurious to health or toxic.
SQE-NE: Only pumps that can be certified as uncon-
taminated, i.e. pumps containing no hazardous and/
or toxic material, may be returned to GRUNDFOS for
servicing.
To prevent injury to the health of persons involved
and to the environment, a document certifying that
the pump is clean is required.
GRUNDFOS must receive this certificate before the
product. Otherwise, GRUNDFOS will refuse to
accept the product for servicing.
Possible costs of returning the pump are paid by the
customer.
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