[Conversion formula]
Setting value (%) =
I
DB
(A)
×
100
I
ref
(A)
Example: If setting I
DB
(A) of 4.2 A with standard applicable motor capacity of 0.75 kW
Setting value (%) =
4.2 (A)
×
100
=
84
5.0 (A)
Braking time (F22)
F22 specifies the braking period that activates DC braking.
Braking response mode (H95)
H95 specifies the DC braking response mode.
Data for H95
Characteristics
Note
0
Slow response. Slows the rising edge of
the current, thereby preventing reverse
rotation at the start of DC braking.
Insufficient braking torque may
result at the start of DC braking.
1
Quick response. Quickens the rising
edge of the current, thereby accelerating
the build-up of the braking torque.
Reverse rotation may result
depending on the moment of
inertia of the mechanical load and
the coupling mechanism.
It is also possible to use an external digital input signal as an "Enable DC braking"
terminal command
DCBRK
.
As long as the
DCBRK
command is ON, the inverter performs DC braking, regardless of
the braking time specified by F22.
Turning the
DCBRK
command ON even when the inverter is in a stopped state activates
DC braking. This feature allows the motor to be excited before starting, resulting in
smoother acceleration (quicker build-up of acceleration torque).
The DC brake function of the inverter does not provide any holding mechanism.
Injuries could occur.
5-35
