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17
Pumps with WIO sensor
For safe installation and operation of pumps
equipped with a WIO sensor, we recommend that
you install an RC filter between the power contactor
and the pump.
Please note that the following aspects may cause
problems in case of transients in the power supply
system:
• Motor power:
– The bigger the motor, the higher the transients.
• Length of power cable:
– Where power and signal conductors are
running in parallel close to each other, the risk
of transients causing interference between
power and signal conductors will increase with
the length of the cable.
• Switchboard layout:
– Power and signal conductors must be
physically separated as much as possible.
Close installation can cause interference in
case of transients.
• Supply network "stiffness":
– If a transformer station is located close to the
installation, the supply network may be "stiff"
and transient levels will be higher.
If combinations of the above aspects are present, it
may be necessary to install RC filters for pumps with
WIO sensors to protect against transients.
Transients can be completely eliminated if soft
starters are used. But be aware that soft starters and
variable speed drives have other EMC-related issues
that must be taken into consideration.
For more information, see section 8.7 Frequency
converter operation
If an RC filter is installed to avoid any kind
of transients in the installation, the RC
filter must be installed between the power
contactor and the pump.
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