Controller Installation 3938 Controller Installation
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Surface pump CS-F motors PSk3 system
Phase-to-phase resistance
[Ω]
AC DRIVE CS-F 5.5 kW PSk3-7 1.4
AC DRIVE CS-F 7.5 kW PSk3-15 1.4
AC DRIVE CS-F 11 kW PSk3-15 0.8
Surface Pump CS-G Motors PSk3 system
Phase-to-phase resistance
[Ω]
AC DRIVE CS-G 5.5 kW PSk3-7 1.7
AC DRIVE CS-G 7.5 kW PSk3-9 1.3
AC DRIVE CS-G 11 kW PSk3-15 0.8
AC DRIVE CS-G 11 kW/4p PSk3-15 0.8
Calculation of expected phase-to-phase
resistance:
= 1.4 Ω + 2 × 150 m × 0.25 Ω / 100 m
= 1.4 Ω + 2 × 0.375 Ω
= 1.4 Ω + 0.75 Ω
= 2.15 Ω
= ~ 2.2 Ω
Cable
Resistance
[Ω / 100 m]
2.5 mm2 / AWG 13 0.82
4 mm2 / AWG 11 0.40
6 mm2 / AWG 9 0.25
10 mm2 / AWG 7 0.17
16 mm2 / AWG 5 0.10
Example:
Motor:
AC DRIVE CS-F 7.5 kW 1.4 Ω
Motor cable:
150 m and 6 mm
2
0.25 Ω / 100 m
The real measured values can be dierent,
depending on the measurement equipment
and materials that are used. This is just an
approximation.
Insulation resistance
Use a megohmmeter at 500 –1,000 V.
Measure each phase to ground. Connect one test
prod to the phase, hold the other test prod to the
pipe work, or if plastic pipes are used to the ground
wire.
If the insulation resistance is below 0.5 MΩ, the
motor cable must be checked for damage.
Wire sizes
For motor cables, the minimum wire size depends on
the system size and sizing. Compare your wire sizes
to the LORENTZ 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 dened 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 6: Motor cable resistance Table 7: Winding resistances for surface pump
motors
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