Hitachi SJ Series, User Manual

Page: 343 / 786

12-15-2
Chapter 12 Inverter Function
12.15.2 Stopping with DC braking
• How to stop the motor when a large moment of
inertia makes it continue rotating even after
deceleration stop
• 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
• 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.
Item Parameter Data Description
DC braking selection [AF101]
00 Internal DC braking: Disabled
01 Internal DC braking: Enabled
02
Internal DC braking: Enabled (The braking
operates only with the frequency command.)
Braking mode
selection
[AF102] 00 Enables the DC braking.
DC braking frequency
setting
[AF103] 0.00~590.00(Hz)
With internal DC braking enabled, DC braking is
started when the output frequency reaches or
becomes less than the frequency set for
stopping.
DC braking delay time [AF104] 0.00~5.00(s)
Specifies the delay in starting DC braking while
temporally shutting off the output.
DC braking force [AF105] 0~100(%)
Adjusts the DC braking force. When "0%" is
specified, no braking operation will be performed.
DC braking time [AF106] 0.00~60.00(s)
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.
DC braking/
edge or level
selection
[AF107]
00 Edge mode (Examples 1-a to 6-a)
01
Level mode (Examples 1-b to 6-b)
Input terminal function [CA-01]~[CA-11] 030
DC braking is enabled by using the [DB] terminal.
OFF: DC braking is disabled.
ON: DC braking is enabled.
Q
A
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