Installation and operating instructions Wilo-Para 39
en
6.2 Electrical connection
The electrical connection may only be carried out by a
qualified electrician.
Preparation
• The current type and voltage must agree with the
specifications on the rating plate (6).
• Maximum back-up fuse: 10 A, slow-blow.
• Only operate the pump with sinusoidal AC voltage.
• Note the switching frequency:
- On/off switching operations via mains voltage
≤ 100/24 h.
- ≤ 20/h for a switching frequency of 1 min.
between switching on/off via mains voltage.
DANGER!
Risk of fatal injury from electrical voltage!
Immediate risk of fatal injury if live components are
touched.
• Before commencing work, switch off the power sup-
ply and secure it from being switched on again.
• Never open the control module (6) and never remove
control elements.
CAUTION!
Pulsed mains voltage can cause damage to electronic
components.
• Never operate the pump with phase angle control.
• When switching the pump on or off using an external
control unit, deactivate any voltage pulse (e.g. phase
angle control).
• For applications where it is not clear whether the
pump is operated with pulsed voltage, get the con-
trol/system manufacturer to confirm that the pump
is operated with sinusoidal AC voltage.
• Switching the pump on/off via triacs/solid-state
relays must be examined on a case-by-case basis.
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