User Manual
EM303A General Purpose Inverter
29
Never Connecting Power Supply Cable to Output Terminals
Never connect power supply cable to output terminals. If power is input to the
output terminals, 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.
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.
z
Inductive interference: Electromagnetic induction generates noise on the signal
line which may cause the control device malfunction.
z
Radio interference: The high frequency electromagnetic waves generated by
inverter and cable cause radio devices nearby to make noise when receiving
signals.
Figure 3-7 Installing a Noise Filter on the Output Side
Countermeasures Against Inductive Interference
As stated previously, except installing a noise filter, all output cables can be routed
through a grounded metal pipe to prevent inductive interference on the output side.
