Motor Controllers AC Variable Frequency Drives
RVBS
Specifications are subjected to change without notice.10/08/2021
30
< Timing scheme for failed retry (No. of reset times: 3) >
Function
code
Mod.
add.
Description
Def
Min
Max
U.M.
R/W
H02
0x0302
Auto-reset (Times)
0
0
10
Times
R/W
H03
0x0303
Auto-reset (Reset interval)
50
5
200
0.1Sec.
R/W
4.2.10
DC-brake function
F15 through F17 specify the DC braking that prevents motor 1 from running by inertia during decelerate-to-
stop operation. If the motor enters a decelerate-to-stop operation by turning OFF the run command or by
decreasing the reference frequency below the stop frequency, the inverter activates the DC braking by flowing
a current at the braking level (F16) during the braking time (F17) when the output frequency reaches the DC
braking starting frequency (F15). Setting the braking time (F17) to "0.00" disables the DC braking.
-
Braking starting frequency (F15):
F15 specifies the frequency at which the DC braking starts its operation during motor decelerate-to-
stop state.
➢
Generally, set the motor rated slip frequency or so to F15. Setting an extremely large value makes the
control unstable; according to conditions, it activates an overvoltage protection.
-
Braking level (F16):
F16 specifies the output current level to be applied when the DC braking is activated. The function
code data should be set, assuming the rated output current of the inverter as 100%, in increments of
1%.
➢
Conversion formula
𝑆𝑒𝑡𝑡𝑖𝑛𝑔 𝑣𝑎𝑙𝑢𝑒 (%) =
𝐼
𝐷𝐵
(𝐴)
𝐼
𝑟𝑒𝑓
(𝐴)
∗ 100
➢
Example: If setting IDB (A) of 4.2 A with standard applicable motor capacity of 0.75 kW
𝑆𝑒𝑡𝑡𝑖𝑛𝑔 𝑣𝑎𝑙𝑢𝑒 (%) =
4.2 (𝐴)
5.0 (𝐴)
∗ 100 = 84
