Electrical Connection - Omron VARISPEED L7 Guia De Inicio Rapido

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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 L2
L1 L3
Ground Bonds
Remove any paint!
PE
Line
Inverter
Filter
Load
L2 V
GND L1 L3 U W GND
Cable Length
as short as possible
Grounded
Metal Plate
Screened
Motor cable
Ground Bonds
Remove any paint!
M
~3
EN-6