Hitachi BRD-E2-30K Operation Manual page 11

2. Use cables at their specified ratings as short as possible: up to 5 meters between the
dynamic braking unit and the inverter (P, N) and up to 50 meters between the dynamic
braking unit and the discharging resistor (P, RB) (or up to 5 meters for the EZ2-30K).
Also make the wire connections as short as possible. Do not loop extra cable.
Example of correct wiring
* In the EZ2-30K system, the cable between the dynamic braking unit and the
discharging resistor must be 5 meters or shorter.
Example of incorrect wiring
The cables must be tied together and supported firmly so there is no excessive load on
the dynamic braking unit.
3. When the parallel connection interlocking function is used, signal cables (MA1, MA2,
SL1, and SL2) between the dynamic braking units must be no more than five meters in
length and no more than 0.75 mm2 in width in its section area. The signal cable must
be fully separated from the main circuit cable.
Main circuit cable
4. When a combination of various resistors are used, the inductance in the resistors may
raise the surge voltage during the switching operation. To prevent this, use larger
cables or twist them.
Always use up to six non-induction resistors as external resistors.
5. Use insulated crimping terminals to connect the cables to the terminal board TM1 (or
TM2 of the EZ2).
6. Use closed-loop terminals with insulated caps to connect cables to the terminal board
TM2 (or TM3 of the EZ2).
Up to
5 meters
Dynamic
Inverter
braking unit
Dynamic
Inverter
braking unit
10 cm or more
- 4 -
Up to
50 meters
Discharging
resistor
(up to 5
meters)*
Discharging
resistor
Signal cable