Lorentz PSk2-7 Manuel D'installation Et De Fonctionnement page 22

20 Controller Installation
Wire sizes
For signal cables, the min. wire size should be 1.5 mm² (16
AWG). For power cables, the min. wire size depends on the
system size and sizing. Compare your wire sizes to the LO-
RENTZ COMPASS sizing reports. Cables should be shielded
to meet EMC requirement.
For outdoor use, cables meeting the requirements of
IEC 60245 - 66 are recommended. For indoor use, the
recommended cable type is defined in IEC 60245 - 57. The
installer must always consider the local situation, codes of
practice and regulations and use a cable that meets these
requirements.
Table 3: Terminal clamping range
Terminal AWG size
GND terminals 12 AWG – 2 AWG
DC input 12 AWG – 2 AWG
terminals (+/-)
Sensor termi- 20 AWG – 14 AWG
nals 1-18
Pump Motor 12 AWG - 2 AWG
(L1, L2, L2, L3)
Motor filters
Due to the high voltages, high power and variable frequency
inverter technology used in solar pumping systems voltage
spikes can occur which can have an ageing effect on motor
winding insulation. To mitigate this effect, it is common to
use a filter between the PSk2 controller and the motor.
The level of accelerated ageing depends mainly on
cable-length and DC-input- voltage. Using a filter reduces
stress on the motor. The filter should be connected directly
on controller-output motor connections (L1,L2,L3).
LORENTZ generally recommends using motor filters.
Further information concerning motor-filters can be found in
Knowledge base in PartnerNET.
Metric size
2.5 - 35 mm²
2.5 - 35 mm²
0.75 - 2.5 mm²
2.5 - 35 mm
2