EM330D User Manual
A Special Purpose Inverter for Hoisting
22
Never Short-Circuit 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, the 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
of inverter. Even worse, the inverter will be damaged.
Please make sure the inverter and motor 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, so the control device may have malfunctions.
Radio interference: The high frequency electromagnetic waves generated by
inverter and cable cause nearby radio devices to make noise when receiving
signals.
See Figure 3-7 for installing a noise filter on the output side.
MCCB
EM330D
Inverter
Noise
Filter
Control
Device
Radio Device
Signal Line
Inductive
Interference
Radio Frequency
Interference
IM
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.
The distance between output cables and signal line should
＞
30cm, and the inductive
interference will be reduced considerably, as shown in Figure 3-8.
