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Installation and operating instructions Wilo-CronoNorm-NL, NLG
21
• The tightening torques for the pump and motor on the baseplate are
listed in Tab. 7.
Tab. 7: Tightening torques for pump and motor
7.6
Electrical connection
7.6.1
Safety
DANGER! Risk of fatal injury!
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 power supply company and in accordance
with the local regulations in force.
• Before beginning work on the product, make sure that the pump
and drive are electrically isolated.
• Make sure that no one can turn on the power supply again before
ending work.
• Make sure that all energy sources can be isolated and locked. If the
machine was switched off by a protective device, it must be made
sure that it can't be switched on again before the error has been
remedied.
• Electrical machines must always be earthed. Earthing must be
appropriate for the motor and meet the relevant standards and
regulations. This also applies to selecting the right size of the
earthing terminals and fastening elements.
• Under no circumstances may connecting cables touch the pipe, the
pump or the motor housing.
• If it is possible that people can come in contact with the machine and
the pumped fluid (for example, on building sites), the earthed con-
nection must be additionally equipped with a residual current circuit
breaker.
• Observe the installation and operating instructions for the acces-
sories!
• During installation and connection work, observe the circuit dia-
gram in the terminal box!
CAUTION! Risk of damage to property!
If the electrical connection is done improperly, there is a danger of
damage to the product.
• The installation and operating instructions must be observed for
electrical connection of the motor.
• The current type and voltage of the mains connection must agree
with the specifications on the rating plate.
7.6.2
Procedure
NOTE:
All three-phase motors are equipped with a thermistor. Wiring infor-
mation can be found in the terminal box.
• Establish the electrical connection via a stationary power cable.
• When pumps are used in systems with water temperatures above
90 °C, a suitably heat-resistant power cable must be used.
• In order to ensure drip protection and strain relief on the cable con-
nections, cables with a suitable outer diameter must be used and the
cable feedthroughs firmly screwed. Furthermore, cables must be bent
off to form outlet loops near screwed connections to avoid the accu-
mulation of drip water.
Screw: M8
M10 M12 M16 M20 M24 M30 M36
Tightening
torque [Nm]
12
25
40
90
175
300
500
700
