SJ700
2
Inverter
Oper
ati
ons
and Monitor
ing
4–19
External Signal
for DC Injection
Braking
When the terminal [DB] is turned ON, the
DC braking [DB] feature is enabled
(regardless of A051 setting). Set the follow-
ing parameters when the external DC
braking terminal is to be used:
• A053 – DC braking delay time setting.
The range 0.0 to 5.0 seconds.
• A054 – DC braking force setting. The
range is 0 to 100% for models -004xxx
to -1500xxx; 0 to 35% for models
-1850xxx to -4000xxx.
The scenarios to the right help show how
DC braking works in various situations.
1.
Scenario 1 – The [FW] Run or [RV]
Run terminal is ON. When the [DB]
terminal turns ON, DC braking is
applied. When the [DB] terminal turns
OFF again, the inverter output ramps to
the previous frequency.
2.
Scenario 2 – The Run command is
applied from the operator keypad. When
the [DB] terminal turns ON, DC braking
is applied. When the [DB] terminal
turns OFF again, the inverter output
remains OFF.
3.
Scenario 3 – The Run command is
applied from the operator keypad. When
the [DB] terminal turns ON, DC braking
is applied after the delay time set by
A053 expires. The motor is in a free-
running (coasting) condition during this
delay time. When the [DB] terminal
turns OFF again, the inverter output remains OFF.
Note the following:
• Do not use the [DB] input continuously or for a long time when the DC braking force setting
A054 is high (depends on the motor application).
• Do not use the [DB] feature for continuous or high duty cycle as a holding brake. The [DB]
input is designed to improve stopping performance. Use a mechanical brake for holding a
stop position.
Set Second or
Third Motors
If you assign the [SET] or [SET3] functions to an intelligent input terminal, you can select
between two or three sets of motor parameters. You may assign one or both of these functions.
These second and third parameters store alternate sets of motor characteristics. When terminal
[SET] or [SET3] is turned ON, the inverter will use the second or third set of parameters
accordingly, generating the frequency output to the motor. When changing the state of the
[SET] or [SET3] input terminal, the change will not take effect until the inverter is stopped.
When you turn ON the [SET] or [SET3] input, the inverter operates per the second or third set
of parameters, respectively. When the terminal is turned OFF, the output function returns to the
original settings (first set of motor parameters). Refer to
“Configuring the Inverter for Multiple
Motors” on page 4–76
for details.
Note the following:
• If the terminal state is changed while the inverter is running, the inverter continues using the
current set of parameters until the inverter is stopped.
• If both SET and SET3 are ON at the same time, SET prevails and the 2nd motor parameters
are in effect.
Opt. Code
07
Symbol
[DB]
Valid for
Inputs
[1] to [8]
Required
Settings
A053, A054
Default
terminal
Requires
config.
Output
frequency
[FW, RV]
[DB]
Scenario 1
Output
frequency
Run command
from operator)
Scenario 2
Output
frequency
Scenario 3
[DB]
Run command
from operator)
[DB]
A053
t
t
t
delay
Opt. Code
and
Symbol
08=[SET]
17=[SET3]
Valid for
Inputs
[1] to [8]
Required
Settings
(none)
Default
terminal
Requires
config.
