Connect the pump to an
external main switch
which ensures all-pole
disconnection with a
contact separation ac-
cording to EN 60204 1.
Make sure that the main
switch is locked in posi-
tion 0. Type and require-
ments as specified in EN
60204-1.
The electrical connection
must be carried out in
accordance with local
regulations.
Set the motor-protective circuit breaker to the rated
current of the pump. The rated current is stated on
the nameplate.
In hazardous locations,
connect pumps to a con-
trol box with a motor pro-
tection relay with IEC trip
class 10.
Set the motor-protective
circuit breaker to the rat-
ed current of the pump.
The rated current is sta-
ted on the nameplate.
A damaged power cable
must be replaced by the
manufacturer, its service
agent or similarly quali-
fied persons.
WIO sensor
Every explosion-proof pump is assembled with a WIO
sensor.
For safe installation and operation of pumps equipped
with a WIO sensor, install an RC filter between the
power supply and the pump.
If an RC filter should be
installed to avoid any
kind of transients in the
installation, install it be-
tween the power supply
and the pump.
The following 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 cables are running in
parallel close to each other, the risk of
transients causing interference between power
and signal cables increases with the length of
the cables.
•
Switchboard layout:
- Power and signal cables must be 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 can 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. Be aware that soft starters and
variable-speed drives have other EMC-related issues
that must be taken into consideration.
For further information, see the installation and
operating instructions for the selected control box or
pump controller.
Frequency converter operation
In principle, all three-phase motors can be connected
to a frequency converter.
However, frequency converter operation often
exposes the motor insulation system to a heavier load
and causes the motor to be more noisy due to eddy
currents caused by voltage peaks.
In addition, large motors operated with a frequency
converter are loaded by bearing currents.
18
English (GB)
Summary of Contents for SE1 100
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