CHV100 Series Close Loop Vector Control Inverter
.29.
•
Inverters of 15KW and below have built-in braking unit. In order to dissipate the
regenerative energy generated by dynamic braking, the braking resistor should be
installed at (+) and PB terminals. The wire length of braking resistor should be less than
5m.
•
Inverter of 18.5KW and above need connect external braking unit which should be
installed at (+) and (-) terminals. The cable between inverter and braking unit should be
less than 5m. The cable between braking unit and braking resistor should be less than
10m.
•
The temperature of braking resistor will increase because the regenerative energy will
be transformed into heat. Safety protection and good ventilation is recommended.
Notice: Be sure that the electric polarity of (+) (-) terminals is right; it is not allowed
to connect (+) with (-) terminals directly, Otherwise damage or fire could occur.
4.5.3 Wiring at motor side of main circuit
l
Output Reactor
When the distance between inverter and motor is more than 50m, inverter may be
tripped by over-current protection frequently because of the large leakage current
resulted from the parasitic capacitance with ground. And the same time to avoid the
damage of motor insulation, the output reactor should be installed.
l
Output EMC filter
EMC filter should be installed to minimize the leakage current caused by the cable and
minimize the radio noise caused by the cables between the inverter and cable. Just see
the following figure.
Figure 4.10 Wiring at motor side.
4.5.4 Wiring of regenerative unit
Regenerative unit is used for putting the electricity generated by braking of motor to the
grid. Compared with traditional 3 phase inverse parallel bridge type rectifier unit,
regenerative unit uses IGBT so that the total harmonic distortion (THD) is less than 4%.
Regenerative unit is widely used for centrifugal and hoisting equipment.
