Grundfos SL1 Series, Инструкции по безопасности

Страница: 19 / 46

English (GB)
19
• The thermal protection of the motor must be
connected.
• The minimum switching frequency is 2.5 kHz.
• Peak voltage and dU/dt must be in accordance
with the table below. The values stated are
maximum values supplied to the motor terminals.
The cable influence has not been taken into
account. See the frequency converter data sheet
regarding the actual values and the cable
influence on the peak voltage and dU/dt.
• If the pump is an Ex-approved pump, check if the
Ex certificate of the specific pump allows the use
of a frequency converter.
• Set the frequency converter U/f ratio according to
the motor data.
• Local regulations and standards must be
complied with.
When operating the pump by a frequency converter,
consider the following:
•
Set the frequency converter for contant torque
operation. Pulse width modulation should be
used.
• The locked-rotor torque will be lower, depending
on the frequency converter type. See the
installation and operating instructions for the
selected frequency converter.
• Frequency converter use can increase the wear
on the shaft seal and bearings.
• The noise level may increase. See the
installation and operating instructions for the
frequency converter used.
• The working condition of bearings and shaft seal
may be affected.
For more information about the frequency converter
operation, see the data sheet and the installation and
operating instructions of the frequency converter of
choice.
Startup
General startup procedure
Maximum repetitive
peak voltage
[V]
Maximum dU/dt
U
N
400 V
[V/
μ
sec.]
850 2000
For further information
on pumps operated by
frequency converter,
visit the Grundfos
Product Center at
https://productselection.
grundfos.com.
DANGER
Electric shock
Death or serious
personal injury
- Before starting work on
the pump, make sure
that the fuses have
been removed or the
main switch has been
switched off. Make
sure that the power
supply cannot be
switched on
unintentionally. Make
sure that all protective
equipment has been
connected correctly.
The pump must not run
dry.
DANGER
Crushing of hands
Death or serious
personal injury
- Do not open the clamp
while the pump is
operating.
Check that there is positive inlet pressure
before starting up the pump.