User Manual
EM303B General Purpose Inverter
28
3.2.6
Wiring the Output Side of Main Circuit
Connecting the Inverter to Motor
Connect inverter output terminals U, V, and W to motor input terminals U, V and W.
Confirm that the motor forwards with the Forward Command. Switch any 2 of the
inverter output terminals U, V, or W to each other and reconnect if the motor reverses.
Never Connecting Power Supply Cable to Output Terminals
Never connect power supply cable to output terminals. If the output terminalsare connected
to power supply, the inverter would be damaged.
Never Short-Circuiting or Grounding Output Terminals
Never touch output terminals directly with bare hands, or connect the output cable to the
housing of inverter. Otherwise, an electric shock and short-circuit may occur. Furthermore,
do not short-circuit the output cable.
Never Using a Phase-shifting Capacitor
Never connect phase-shifting electrolytic capacitor or LC/RC filter to the output circuit.
Otherwise, inverter will be damaged.
Never Using an Electromagnetic Switch
Never connect electromagnetic switch or electromagnetic contactor to the output circuit.
Otherwise, failure to comply will cause overcurrent or overvoltage protection. Even
worse, inverter will be damaged.
Please make sure that the inverter stops before installing electromagnetic contactor to
switch grid power supply.
Installing a Noise Filter on the Output Side
Install a noise filter on the output side of inverter to reduce inductive interference and radio
interference.
Inductive interference: Electromagnetic induction generates noise on the signal line
which may cause the control device malfunction.
Radio interference: The high frequency electromagnetic waves generated by inverter and
cable cause radio devices nearby to make noise when receiving signals.
MCCB
EM303B
Inverter
Noise
Filter
Control
Device
Radio Device
Signal Line
Inductive
Interference
Radio Frequency
Interference
IM
Figure 3-8 Installing a Noise Filter on the Output Side