5. Assembly instructions
Page 15
EN
5.6 Electrical connection
The pump may only be electrically
connected up by an appropriately
qualified and instructed expert. The
information in this operating manual
must be observed.
The pump motor must be connected up in
accordance with the specifications on the rating
plate and the available mains voltage.
The connection itself must comply with all valid
VDE directives (such as VDE 0100, VDE 0101,
and VDE 0165) and with the connection
requirements of the responsible power supply
company.
The cables and lines must be secured in the
junction box by means of a cable gland with
strain relief.
The circuit must comply with the circuit
diagram in the motor junction box.
In the case of a pump which has been left
stored without being used for a relatively long
period of time in a damp room, we recommend
that you measure the insulation resistance of
the winding to the housing prior to
commissioning.
The minimum value for a winding temperature
of around 20ºC is 1 k
Ω
per volt of rated voltage
for low*voltage motors. If the resistance is
lower than this, the motor must be dried out in
a warm room or using a heating device until
the required insulation value is reached.
5.7 Rotational direction
The rotational direction of the motor must
match the direction of the arrow on the pump.
To check the rotational direction, open the
valves in the pressure and suction lines and
switch the motor on for around 1 second.
An incorrect rotational direction can
cause damage to the pump.
