9.4 Built-in protection
The motor incorporates an electronic unit which
protects 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 has been stopped as a result of dry
running, it will start automatically after 5 minutes.
If the pump is restarted and the borehole is empty, the
pump will stop after 30 seconds.
Resetting of the pump: Switch off the power supply
for 1 minute.
The motor is protected in case of:
•
dry running
•
voltage surges (up to 6000 V) In areas with high
lightning intensity, external lightning protection is
required.
•
overvoltage
•
undervoltage
•
overload
•
overtemperature.
SQE pumps/MSE 3 motors
Via the CU 300 or CU 301, the dry-running
stop limit of the MSE 3 motors can be ad-
justed to match the actual application.
10. 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 service
centre.
10.1 Contaminated pumps
If a pump has been used for a liquid which
is injurious to health or toxic, the pump will
be classified 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 liquids
which are injurious to health or toxic.
SQE-NE:
Only pumps that can be certified as
uncontaminated, 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.
19
English (GB)
Summary of Contents for SQ 1
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