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4.4
Example of External Connection (Parallel Connection Operation)
Figure 4.3 shows a connection example of a motor control system, which uses the parallel
connection interlocking function.
In this case, both the main unit and the sub-unit must use external resistors of the same
resistance.
To prevent overheating and burning if the dynamic braking unit malfunctions, provide a thermal
relay to shut off the primary power of the inverter when the thermal relay is operating.
Figure 4.3 shows the connection of a thermal relay and Table 4.3 shows a list of applicable
wires.
Note 1: Select relay RY according to the coil (Mg)
specifications and the contact (RY) specifications.
Note 2: R0, T0 terminals depend on inverter model.
External
resistor
External
resistor
Thermal relay
Thermal relay
(Note 2)
(Note 1)
Dynamic braking unit
Sub-unit
Dynamic braking unit
Main unit
Motor
Inverter
200V class
3-phase power supply
400V class
Operating
power supply
Figure 4.3 External connection example for the parallel connection operation
