Hitachi SJ Series User Manual page 343

Chapter 12
12.15.2 Stopping with DC braking
Q
• How to stop the motor when a large moment of
inertia makes it continue rotating even after
deceleration stop
A
• To use DC braking for stopping, the following
settings are required:
- Set [AF101] DC braking selection to 01
- Set [AF102] Braking mode selection to 00
- [AF105] DC braking force
- Set [AF106] DC braking time to other than 0.0
• To use DC braking with frequency command, the
following settings are required:
- Set [AF101] DC braking selection to 02
- Set [AF102] Braking mode to 01 or 02.
- Set [AF103] DC braking frequency setting to
other than 0.00
- [AF105] DC braking force
- Set [AF106] DC braking time to other than 0.0
Parameter
Item
DC braking selection
Braking mode
selection
DC braking frequency
setting
DC braking delay time
DC braking force
DC braking time
DC braking/
edge or level
selection
Input terminal function
Parameter
[AF101]
[AF102]
[AF103] 0.00~590.00(Hz)
[AF104] 0.00~5.00(s)
[AF105] 0~100(%)
[AF106] 0.00~60.00(s)
[AF107]
[CA-01]~[CA-11]
12-15-2
!
• The carrier frequency during DC braking depends
on [bb101], but it is limited to at maximum 5 kHz.
Depending on the set braking force, the carrier
frequency may automatically go down to 2 kHz.
• When the motor is stopped by using [DB] external
DC braking function (input terminal function 030),
a high output frequency or a high-inertia load may
cause an overcurrent error or overvoltage error.
Data
00 Internal DC braking: Disabled
01 Internal DC braking: Enabled
Internal DC braking: Enabled (The braking
02
operates only with the frequency command.)
00 Enables the DC braking.
With internal DC braking enabled, DC braking is
started when the output frequency reaches or
becomes less than the frequency set for
stopping.
Specifies the delay in starting DC braking while
temporally shutting off the output.
Adjusts the DC braking force. When "0%" is
specified, no braking operation will be performed.
Sets the duration for DC braking. This setting is
valid for the [DB] terminal in edge mode or for the
internal DC braking. When "0.00 s" is specified,
no braking operation will be performed.
00 Edge mode (Examples 1-a to 6-a)
Level mode (Examples 1-b to 6-b)
01
DC braking is enabled by using the [DB] terminal.
030 OFF: DC braking is disabled.
ON: DC braking is enabled.
Inverter Function
Description