Soft Starter; Maintenance And Service; Troubleshooting - Grundfos SP Serie Instrucciones De Instalación Y Operación

8.2 Soft starter

The starting voltage is minimum 55 % of the
value stamped on the nameplate.
If a high locked-rotor torque is required or if the
power supply is not optimal, the starting voltage
must be higher.
Run-up time (until voltage stamped on
nameplate is reached): Maximum 3 seconds.
Run-out time: Maximum 3 seconds.
If the above-mentioned run-up and run-out
ramps are followed, unnecessary heating of the
motor is avoided.
If the soft starter is fitted with bypass contacts,
the soft starter will only be in operation during
run-up and run-out.
Do not use the soft starter in connection with
operation via a generator.
Voltage
100 %
55%
0
3 sec.
Fig. 17 Operation with a soft starter

8.3 Maintenance and service

All pumps are easy to service.
Service kits and service tools are available from
Grundfos.
The pumps can be serviced at a Grundfos
service center.
WARNING
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.
Possible costs of returning the pump are paid by
the customer.
Time
3 sec.

9. Troubleshooting

The majority of problems that develop with
submersible pumps are electrical, and most of
these problems can be corrected without pulling
the pump from the well. The following chart
covers most of the submersible service work. As
with any troubleshooting procedure, start with
the simplest solution first; always make all the
above-ground checks before pulling the pump
from the well.
Usually only two instruments are needed:
• a combination of voltmeter and ammeter
• an ohmmeter.
These are relatively inexpensive and can be
obtained from most water systems suppliers.
WARNING
When working with electrical circuits,
use caution to avoid electric shock.
We recommend that you use rubber
gloves and boots and that you take
care to have metal control boxes and
motors grounded to power supply
ground or steel drop pipe or casing
extending into the well.
WARNING
Submersible motors are intended for
operation in a well. When not
operated in a well, failure to connect
motor frame to power supply ground
may result in serious electric shock.
25