1-1 Wiring 1Design 1-1 Wiring 1 For connections of the Regenerative Braking Unit, Inverter and Braking Resistor (P, RB, and N ter- minals), use cables with the following length: Design The wiring must be routed at the shortest distance. Be sure not to coil up any surplus cables. Doing so may cause a fault in the equipment. The cable connected to the P and N terminals for wiring between the Regenerative Braking Unit and the Inverter, as well as the cable connected to the P and RB terminals for wiring between the Regenerative Braking Unit and the Braking Resistor must be bundled with a tie band, so that these cables are not placed at a distance.
In order to prevent the Braking Register in the Regenerative Braking Unit from burning due to over- heating, be sure to connect the alarm contacts (AL1 and AL2) and provide a circuit to turn off the primary power supply for the Inverter. When several Regenerative Braking Units are connected in parallel, the length of the signal cables (MA1, MA2, SL1, SL2) between individual Regenerative Braking Units must be 5 m or less, and the cable size must be 0.75 mm 2 or more. Be sure to separate the signal cables from the main circuit cable. 1-1 Model (3G3AX-) Between Regenerative Braking Unit and Inverter Between Regenerative Braking Unit and Braking Resistor RBU21 5 m max. 5 m max. RBU22 5 m max.
5 m max. RBU23 4 m max. 50 m max. RBU24 Braking resistance: 4 Ω min. 4 m max. Less than 4 Ω 3 m max. 50 m max. RBU41 5 m max. 5 m max. RBU42 4 m max. 5 m max. RBU43 4 m max. 50 m max. Regenerative Braking Correct example : Inverter Braking Unit Resistor Regenerative Braking Incorrect example : Inverter Braking Unit Resistor Inverter Regenerative Braking Unit Braking Resistor Main circuit cable 10 cm min. Signal cable