SJ700
2
Inverter
Configur
ing Dr
iv
e
P
a
ra
met
e
rs
3–19
You can configure DC braking to initiate in one of two ways:
1.
Internal DC braking
– Set A051=01 to enable internal braking. The inverter automatically
applies DC braking as configured (during stopping, starting, or both).
2.
External DC braking
– Configure an input terminal with option code 7 [DB] (see
“Exter-
nal Signal for DC Injection Braking” on page 4–19
for more details). Leave A051=00,
although this setting is ignored when a [DB] input is configured. The DC braking force
settings (A054 and A057) still apply. However, the braking time settings (A055 and A058)
do not apply (see level and edge triggered descriptions below). Use A056 to select level or
edge detection for the external input.
a.
Level triggered – When the [DB] input signal is ON, the inverter immediately applies
DC injection braking, whether the inverter is in Run Mode or Stop Mode. You control
DC braking time by the duration of the [DB] pulse.
b.
Edge triggered – When the [DB] input transitions OFF-to-ON and the inverter is in Run
Mode, it will apply DC braking only until the motor stops... then DC braking is OFF.
During Stop Mode, the inverter ignores OFF-to-ON transitions. Therefore, do not use
edge triggered operation when you need DC braking before acceleration.
CAUTION:
Be careful to avoid specifying a braking time that is long enough to cause motor
overheating. If you use DC braking, we recommend using a motor with a built-in thermistor
and wiring it to the inverter’s thermistor input (see
“Thermistor Thermal Protection” on page 4–
25
). Also refer to the motor manufacturer’s specifications for duty-cycle recommendations
during DC braking.
Func.
Code
Name/
Description
Keypad
Range and Settings
Defaults
Run
Mode
Edit
Lo Hi
SRW
OPE
FEF2
FE2
(EU)
FUF2
FU2
(USA)
FF2
F2
(Jpn)
A051
DC braking enable
OFF
00
Disable
00
00
00
✘ ✔
ON
0 1
Enable
✘ ✔
DON
02
Brake at set frequency only
✘ ✔
A052
DC braking frequency setting
0.00 to 60.00 (Hz)
0.50
0.50
0.50
✘ ✔
Frequency at which DC braking activates during decel.
✘ ✔
A053
DC braking wait time
0.0 to 5.0 (seconds)
0.0
0.0
0.0
✘ ✔
The delay after reaching the DC braking frequency, or
[DB] signal, before DC braking begins
✘ ✔
A054
DC braking force during deceleration
0. to 80. (%)
0.
0.
0.
✘ ✔
Variable DC braking force
✘ ✔
A055
DC braking time for deceleration
0.0 to 60.0 (seconds)
0.0
0.0
0.0
✘ ✔
Sets the duration for DC braking during decel
✘ ✔
A056
DC braking / edge or level detection
for [DB] input
EDGE
00
Edge detection
01
01
01
✘ ✔
LEVEL
0 1
Level detection
A057
DC braking force for starting
0. to 80. (%)
0.
0.
0.
✘ ✔
Variable DC braking force
A058
DC braking time for starting
0.0 to 60.0 (seconds)
0.0
0.0
0.0
✘ ✔
Sets the duration for DC braking before accel.
A059
DC braking carrier frequency setting
0.5 to 15 (kHz) up to SJ700-1500;
0.5 to 3.0kHz for models SJ700-
1850 to SJ700-4000
3.0
3.0
3.0
✘ ✘