N700 Operating Instructions and Parts Manual
7. Explanation of A-Group
64
Fig. 7- 9 Jump frequency setting curve
7.11
DC braking setting (A081~A088)
z
A dc voltage can be applied to the motor windings in order to lock the motor shaft and avoid
overrun at low speeds.
z
There are two methods of activating the dc braking. One is the external method which uses
the intelligent input
terminals, the other is the internal method which is automatically
started at a specific frequency.
Code
Function name
Initial
Value
Unit
Setting
range
Contents
0
Internal DC braking : invalid
A081
DC braking
selection
0 -
1
Internal DC braking : valid
A082
DC braking
frequency
0.50 Hz
0.00~60.00
When the output reaches the set frequency and
Internal DC braking is valid, DC braking is started.
A083
DC braking wait
time
0.0 Sec.
0.0~5.0
After DC braking time is reached, or DB terminal is
ON, the late time is a delay before DC braking is
started.
A084 DC braking force
0
%
0~100
Weak (Zero current)~Strong (Range is from 0 to
80%)
A085 DC braking time
0.00
Sec.
0.00~60.00
The DC braking is stopped after this time delay has
elapsed. The time is started when the late time has
elapsed.
0 Edge
movement
A086
DC braking
edge/level
selection
1 -
1 Level
movement
A087
DC braking force
for starting
0 % 0~100
Weak (Zero current)~Strong (Range is from 0 to
80%)
A088
DC braking time for
starting
0.00 Sec.
0.00~60.00
The DC braking is stopped after this time delay has
elapsed. The time is started when the late time has
elapsed.
Table 7- 11 DC braking setting (A081~A088)
(1) External DC braking
①
Please set 7 (DB) to an intelligent input terminal.
②
DC braking can be activated according to ON/OFF switching of DB terminal irrespective
of DC braking selection A081.
③
Set the strength of DC braking power with A084.
④
If DC braking late time A083 is set, the inverter output is cut off for this time period, the
motor will be free running. After the late time passes, DC braking is started.
⑤
Please set DC braking capacity and time A085/A088 or DC braking capacity and time by