English (GB)
3
Approvals
The standard versions of SE1 and SEV pumps have
been tested by VDE, and the explosion-proof
versions approved by DEKRA according to the ATEX
directive.
The standard variants are approved by LGA (notified
body under the Construction Products Directive)
according to EN 12050-1 or EN 12050-2 as specified
on the pump nameplate.
The SE1 and SEV pumps have the following
explosion protection classifications:
• CE 0344 II2 GD Ex db eb h mb IIB T4, T3 Gb:
Ex h mb tb IIICT135 °C, T200 °C Db.
Maximum surface temperature is 135 °C (T4) in
direct-drive pumps and 200 °C (T3) in pumps driven
by frequency converter, according to EN 60079-0
Frequency converter operation
All SE1, SEV pump types are designed for frequency
converter operation to keep the energy consumption
at a minimum.
For frequency converter operation, please observe
the following information:
Requirements must be fulfilled.
Recommendations ought to be fulfilled.
Consequences ought to be considered.
Requirements
• The thermal protection of the motor must be
connected.
• Minimum switching frequency: 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 or standards must be fulfilled.
Recommendations
Before installing a frequency converter, calculate the
lowest allowable frequency in the installation in order
to avoid zero flow.
• Do not reduce the motor speed below 30 % of
rated speed.
• Keep the flow velocity above 1 m/sec.
• Let the pump run at rated speed at least once a
day in order to prevent sedimentation in the
piping system.
• Do not exceed the frequency indicated on the
nameplate. In this case there is risk of motor
overload.
• Keep the power cable as short as possible. The
peak voltage will increase with the length of the
power cable. See data sheet for the frequency
converter used.
• Use input and output filters on the frequency
converter. See data sheet for the frequency
converter used.
• Use a screened power cable if there is a risk that
electrical noise can disturb other electrical
equipment. See data sheet for the frequency
converter used.
Consequences
When operating the pump via a frequency converter,
please be aware of these possible consequences:
• The locked-rotor torque will be lower. How much
lower will depend on the frequency converter
type. See the installation and operating
instructions for the frequency converter used for
information on the locked-rotor torque available.
• The working condition of bearings and shaft seal
may be affected. The possible effect will depend
on the application. The actual effect cannot be
predicted.
• The acoustic noise level may increase. See the
installation and operating instructions for the
frequency converter used for advice as to how to
reduce the acoustic noise.
Operating conditions
Operating pressure
All pump housings have PN 10 outlet flanges.
Operating mode
The pumps are designed for continuous operation,
S1, or intermittent operation, S3.
Operating mode S3 means that within 10 minutes the
pump must be in operation for four minutes and
stopped for six minutes.
Maximum repetitive peak
voltage
[V]
Maximum dU/dt UN
400 V
[V/μsec.]
850 2000
