T Description Of Peripheral Electrical Devices - V&T E5 Series User Manual

3.T Description of Peripheral Electrical Devices

Circuit breaker
RCCB
(Residual current
circuit breaker)
Contactor
Input AC reactor
or DC reactor
Input noise filter
Thermal protection
relay
Output noise filter
Output AC reactor
E5 Series High Performance Universal Inverter
The circuit breaker capacity should be T.5 ~ T times of the inverter rated current.
The time features of the circuit breaker should fully consider the time features of the inverter
overload protection.
The inverter output is the high−frequency pulse and also generates leakage currents to
ground. Special RCCB shall be used when installing RCCB at the input end of the inverter. It
is suggested that B type RCCB should be used, and the leakage current value shall be set to
300mA.
Frequent contactor action will cause inverter failure, so the highest frequency for the open
and close of contactor shall not exceed T0 timesTmin.
When braking resistor is used, to avoid the over-temperature damage of the braking resistor,
a thermal protection relay with braking resistor over-temperature detection should be
installed to disconnect the contactor of power supply.
T. The inverter power supply capacity is more than 600kVA or T0 times of the inverter capacity.
T. If there is switch type reactive−load compensation capacitor or load with silicon control at
the same power node, there will be high peak current flowing into input power circuit,
which damage the rectifier components.
3. When the voltage imbalance of the three−phase power supply of the inverter exceeds
3%, the rectifier component will be damaged.
4. It is required that the input power factor of the inverter shall be higher than 90%.
5. When exists the above situations, the AC reactor at the inverter input side or DC reactor
to the DC reactor terminal should be installed.
Reduce external conduction and radiation interference of the inverter.
Decrease conduction interference flowing from power supply and improve the
anti-interference capacity.
Although the inverter has motor overload protection function, when one inverter drives two or
more motors or multi−pole motors, to prevent the motor over temperature, thermal protection
relay shall be installed between the inverter and each motor, and the motor overload
protection parameter P9.T6 shall be set to "T" (motor protection disabled).
When the output end of the inverter is connected with noise filter, the conduction and
radiation interference can be reduced.
When the cable connecting the inverter and the motor is longer than T00m, it is suggested to
install AC output reactor to suppress the high−frequency oscillation to avoid damaging motor
insulation, large leakage current and frequent inverter protective action.
Chapter 3 Electrical Installation
User's Manual
17