Wiring Of Braking Resistor And Regenerative Braking Unit - Hitachi WJ Series User Manual

Chapter 5
5.3.5

Wiring of Braking Resistor and Regenerative Braking Unit

 How can an overvoltage error be avoided when short deceleration time is set?
Q
 How can an overvoltage error be avoided at lowering or hanging for crane or elevator?
 In WJ-C1, a braking resistor circuit is built-in as standard.
A
 By installing optional braking resistor or regenerative braking unit, the braking force can be
improved and the overvoltage can be suppressed, and it can be used even with large
regenerative loads (lowering load or load applied at high-speed rotation).
 Refer to "9.9.5 Suppressing Overvoltage with Braking Resistor" for details on the setting when
connecting a braking resistor. When connecting the regenerative braking unit, set "Dynamic
brake activation selection [b095]" to "Disable (00)".
Short-circuit bar
Cautions for the brake resistor connection terminals ([P/+], [RB]) and regenerative
!
brake unit connection terminals ([P/+], [N/-])
Failure
Burnout
Prohibited
N RB PD P
● Risk of damage to the inverter and burnout of the braking resistor!
 Do not connect items other than the braking resistor between [P/+] and [RB]
terminals.
 Do not short-circuit [P/+] and [RB] terminals.
 Arrange devices so that the heat generated by the braking resistor and
regenerative braking unit does not affect the inverter.
 Do not attach a resistor whose resistance is lower than the predefined value.
Otherwise, the braking resistor (BRD) circuit or the regenerative braking unit
may be damaged.
Braking resistor
(option)
Short-circuit
bar
PD/+1
RB
N/-
Regenerative braking
unit (option)
Short-circuit bar
PD/+1
RB
N/-
5-3-7
Wire Connection
P/+
P/+