Chapter 4 Wiring of Inverter
Shanghai Sigriner STEP Electric Co., Ltd.
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EN60204-1 and IEC60364-5-2/2001 standards
PVC insulation
30°C ambient temperature
70°C surface temperature
Symmetrical cables with copper mesh shielding
No more than 9 cables placed side by side in the
same cable tray
For copper-core cables, see NEC Table 310-16
90°C cable insulation
40°C ambient temperature
No more than 3 current-carrying wires in the same raceway,
cable trench or buried cable
Copper-core cables with copper mesh shielding
To ensure personnel safety, proper operation, and to reduce electromagnetic radiation, the inverter
and motor must be grounded at the installation.
The diameter of the conductors must meet the requirements of safety regulations.
The power cable shield must be connected to the PE end of the inverter to comply with
safety rules.
The shield of the power cable wire may be used as a ground wire for the equipment only if
the specifications of the shield meet the safety regulations.
When installing multiple inverters, do not connect the inverter terminals in series.
4.1.2.4 Output power cables/connections
The technical requirements for motor connections are shown in Table 4-4.
Table 4-4 Technical requirements for motor connection
Technical requirements for output power (motor) connection
0~Input voltage, symmetrical three-phase voltage
See chapter 2 "2.2 Technical performance and
specifications of the inverter"
Relationship between motor cable
length and switching frequency
See chapter 4 "4.4.5 Relationship between wiring length
and carrier frequency"
Grounding and wiring
Motor cable requires shielding with conductor tubes, armored cables or shielded cables.
Shielded/Armored cables: High frequency, low impedance shielded cables such as braided copper
wire mesh, aluminum wire mesh or iron wire mesh should be used.
Conduit
Each end of the conduit needs to be fitted with a bridging connection with a grounding
conductor.
The conduits are secured to the shell.
Use a separate conduit line for the motor cables (also separate the input power cables from
the control cables).
Use a separate conduit line for each inverter.
Armored cable
Each end of the conduit needs to be fitted with a bridging connection with a grounding
conductor.
Use the MC type continuous corrugated aluminum armored cable with symmetrical
ground wires and 6 conduits (3 power conduits and 3 ground conduits).
The armored motor cable can share a cable tray with the input power cable, but cannot
share a cable tray with the control cable.
Shielded cable
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