EN-6
Electrical Connection
Installation of Inverters and EMC filters
For an EMC rules compliant installation consider the following
points:
•
Use a line filter.
•
Use shielded motor cables.
•
Mount the inverter and filter on a grounded conductive plate.
•
Remove any paint or dirt before mounting the parts in order to
reach the lowest possible grounding impedance.
Wiring Main Circuit Inputs
Consider the following precautions for the main circuit power sup-
ply input.
•
If a moulded case circuit breaker is used for the power supply connection (R/L1, S/L2, and T/L3), ensure
that the circuit breaker is suitable for the Inverter.
•
If an earth leakage breaker is used, it should be able to detect all kinds of current should be used in order to
ensure a safe earth leakage current detection
•
A magnetic contactor or other switching device can be used at the inverter input. The inverter should not
be powered up more than once per hour.
•
The input phases (R/S/T) can be connected in any sequence.
•
If the Inverter is connected to a large-capacity power transformer (600 kW or more) or a phase advancing
capacitor is switched nearby, an excessive peak current could flow through the input power circuit, causing
an inverter damage. As a countermeasure install an optional AC Reactor at the inverter input or a DC reac-
tor at the DC reactor connection terminals.
•
Use a surge absorber or diode for inductive loads near the Inverter. Inductive loads include magnetic con-
tactors, electromagnetic relays, solenoid valves, solenoids, and magnetic brakes.
Wiring the Output Side of the Main Circuit
The following precautions should be considered for the output circuit wiring.
•
Never connect any power source to the inverter output terminals. Otherwise the inverter can be damaged.
•
Never short or ground the output terminals. Otherwise the inverter can be damaged.
•
Do not use phase correction capacitors. Otherwise the inverter and capacitors can be damaged.
•
Check the control sequence to make sure, that the magnetic contactor (MC) between the Inverter and
motor is not turned ON or OFF during inverter operation. If the MC is turned ON during the Inverter is
operation, a large inrush current will be created and the inverter’s over current protection may operate.
Ground Connection
The following precautions should be considered for the ground connection.
•
Do not share the ground wire with other devices, such as welding machines or power tools.
•
Always use a ground wire, that complies with technical standards on electrical equipment and minimize
the length of the ground wire.
PE
L1
L2
L3
PE
Line
Filter
Load
GND L1
L2
L3
GND
U
V
W
M
~3
Inverter
Ground Bonds
Remove any paint!
Ground Bonds
Remove any paint!
Cable Length
as short as possible
Grounded
Metal Plate
Screened
Motor cable
