Electrical Connection - Wilo CronoLine-IL 250 Série Notice De Montage Et De Mise En Service

English
r 2,5 · (d · 2s)
5 x DN
Fig. 34: Settling section before and after
the pump
Final check
7.2

Electrical connection

Safety
Preparation/Notes
34
• Adapters for larger nominal diameters should be made with an flaring
angle of about 8° to prevent greater pressure losses.
NOTE
Shut-off devices shall be installed in front of and behind the pump in
all cases, in order to avoid having to drain the entire system when
checking, servicing or replacing the pump. If need be, the necessary
non-return valves are to be provided.
NOTE
A settling section must be provided before and after the pump, in the
form of a straight pipe. The length of this settling section should be at
least 5 x DN of the pump flange (Fig. 34). This measure serves to avoid
flow cavitation.
• Only connect the pipes after the conclusion of all welding and solder-
ing work as well as the cleaning/flushing of the system.
• Remove the flange covers at the suction and pressure ports of the
pump before attaching the piping.
Check the alignment of the unit again as described in chapter 7.1
"Installation" on page 32.
• Tighten the foundation bolts if necessary.
• Check all connections for correctness and function.
• It must be possible to turn the coupling/shaft by hand.
Do not allow the coupling/shaft to turn:
• Release the coupling and re-tighten.
In case this measure is not successful:
• Remove the motor (see chapter 9.3 "Motor" on page 41).
• Clean the motor centring and flange
• Reinstall the motor.
DANGER! Danger of death!
A fatal shock may occur if the electrical connection is not made
correctly.
• Only allow the electrical connection to be made by an electrician
approved by the local electricity supplier and in accordance with
the local regulations in force.
• Observe the installation and operating instructions for the acces-
sories.
WARNING! Risk of mains overload!
An inadequate mains design can lead to system failures and even to
cable fires due to mains overload.
• When designing the mains, with regard to the cable cross-sections
and fuses, give special consideration to the fact that short-term
simultaneous operation of all pumps is possible in multi-pump
operation.
• The electrical connection must be done in accordance with EN 50178,
EN 60204-1/ IEC 60204-1, IEC 60364 via a fixed connected load.
• To ensure protection from drips and strain relief of the PG screwed
connection, a connected load is to be used with sufficient outer
diameter. By positioning the PG screwed connection or by laying the
cables accordingly, ensure that no drips can enter the terminal box.
• When pumps are used in systems with water temperatures above
90°C, a suitably heat-resistant connection line must be used.
• The connection line is to be placed in such a way that it can under no
circumstances come into contact with the pipe and/or the pump and
motor housing.
WILO SE 11/2013