Dynamic Braking - Hitachi P1 Basic Instruction Manual

DYNAMIC BRAKING

The dynamic braking is used to electronically brake the motor during deceleration. Dynamic braking required the use of a braking
resistor or a regenerative converter. The parameters below only apply when using a resistor.
Load-Brake
– The internal load-brake absorbs 99% of the dynamic braking. The dynamic braking usage ratio should be set to 3% to
detect when the load-brake becomes worn, and maintenance is required. Setting the dynamic braking usage ratio greater than 3% will
result in the resistor becoming hot and damaging the VFD.
Non-Load-Brake
–The dynamic braking usage ratio should be set to 100%.
Dynamic braking mode
– By default this is set to 2:enabed all the time. This helps suppress the DC BUS voltage from causing an E07
fault during idle if power spikes occur randomly. If the power becomes high for a long period of time this will cause an E06 fault to
occur.
Dynamic braking voltage activation level
cases with high input power, you may need to adjust the level or an E06 will occur.
Function
Dynamic braking allowable usage
ratio
Dynamic braking Mode
Dynamic braking DC BUS voltage
activation level
– This is the DC BUS voltage level in which the braking chopper circuit will activate. In some
Parameter
bA-60
Non-Load-Brake = 100%
bA-61 1 = enabled during RUN
2 = enabled all the time
200V Class – (330 – 400V)
bA-62
400V Class (660 – 800V)
Page 35
Values
Load-Brake 3%
0 = disabled
Factory Default
3%
100%
1 = enabled during RUN
380V
780V