– A high-sensitivity differential switch (30 mA) [residual current device RCD] suitable
for earth fault currents with DC or pulsating DC content (a Type B RCD is
suggested).
– A mains isolator switch with a contact gap of at least 0.12 in (3 mm).
The electrical control panel checklist
NOTICE:
The control panel must match the ratings of the electric pump. Inappropriate
combinations do not guarantee the protection of the unit.
Check that the following requirements are met:
• The control panel must protect the converter and the pump against short circuit. A
time lag fuse or a circuit breaker (Type C model is suggested) can be used to protect
the pump.
• The pump has built-in overload and thermal protection. No additional overload
protection is required.
Electrical Hazard:
Before starting work on the unit, make sure that the unit and the control panel are isolated
from the power supply and cannot be energized.
Grounding (earthing)
Electrical Hazard:
• Always connect the external protection conductor to the ground terminal before
attempting to make any other electrical connections.
• Connect all the electric accessories of the pump and the motor to the ground, making
sure that the connections are completed correctly.
• Check that the protection conductor (ground) is longer than the phase conductors; in
case of accidental disconnection of the power supply conductor, the protection
conductor (ground) must be the last one to detach itself from the terminal.
Use a cable with several strands to reduce electric noise.
4.3.2 Wire types and ratings
• All cables must comply with local and national standards in terms of section and
ambient temperature.
• Use cables with minimum heat resistance 158°F (+70°C); to ensure compliance with UL
(Underwriters Laboratories) regulations, all power supply connections must be
completed using the following types of copper cables with minimum resistance 167°F
(+75°C): THW, THWN
• Cables must never enter into contact with the motor body, the pump or the piping.
• The wires connected to the power supply terminals and the fault signal relay (NO, C)
must be separated from the others by means of reinforced insulation.
Table 3: Electric connection cables
Smart motor models
Power supply input cable + PE
Tightening torque
Wire numbers x Max.
copper section
Wire numbers x Max.
AWG
Mains and motor
cable terminals
Earth Conductor
103, 105, 107, 111,
115
3 x 0.0023 sq.in
3 x 1.5 mm2
3 x 16 AWG with
ferrules/14 AWG
without
Spring connectors
Spring connectors
303, 305, 307, 311,
315, 322
4 x 0.0023 sq.in
4 x 1.5 mm2
4 x 16 AWG with
ferrules/14 AWG
without
7.1 lb-in
0.8 Nm
26.6 lb-in
3 Nm
4 Installation
Smart Pump Range INSTRUCTION MANUAL
17
