Example Of External Connection (Parallel Connection Operation) - Hitachi BRD-E2-30K Operation Manual

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.
400V class
Operating
power supply
200V class
Figure 4.3 External connection example for the parallel connection operation
(Note 2)
Motor
Inverter
Dynamic braking unit
Dynamic braking unit
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.
- 7 -
(Note 1)
Main unit
Thermal relay
Sub-unit
Thermal relay
External
resistor
External
resistor