Hitachi SJ7002 Series Instruction Manual page 181

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