Hitachi SJ Series User Manual page 347

Chapter 12
12.15.3 Stopping with servo-lock
Q
• How to stop the motor when a large moment of
inertia makes it continue rotating even after
deceleration stop
• How to stop the motor at a fixed position
A
• To use DC braking for stopping (servo-lock
control), the following settings are required:
- [AA121] Control mode (see the right section)
- Set [AF101] DC braking selection to 01
- Set [AF102] Braking mode selection to 01 or
02.
- Set [AF106] DC braking time to other than 0.0
Parameter
Item
DC braking selection
Braking mode
selection
DC braking frequency
DC braking delay time
DC braking time
DC braking
edge or level
selection
Input terminal function
Control mode
Parameter
[AF101]
[AF102]
[AF103] 0.00~590.00(Hz)
[AF104] 0.00~5.00(s)
[AF106] 0.00~60.00(s)
[AF107]
[CA-01]~[CA-11]
[AA121]
12-15-6
!
• The carrier frequency during DC braking depends
on [bb101], but it is limited to at maximum 5 Hz.
Depending on the set braking force, the carrier
frequency may automatically go down to 2 kHz.
• To use the servo-lock control, it is necessary to set
[AA121] Control mode. If the applicable control
mode is not selected, the inverter will operate as if
[AF102] has been set to 00: DC braking.
(1) When [AF102] Braking mode selection is set to
01: Speed servo-lock
[AA121] Control mode
No.
09: 0Hz-range sensorless vector control
1
10: Vector control with sensor
2
(2) When [AF102] Braking mode selection is set to
02: Position servo-lock
[AA121] Control mode
No.
10: Vector control with sensor
1
• To use the servo-lock control, it is necessary to set
[AA121] Control mode. See "12. 9 Selecting the
Motor Control Method According to Motor and
Load".
• The output of the servo-lock control is
automatically calculated according to the selected
control mode.
Data
00 Internal DC braking: Disabled
01 Internal DC braking: Enabled
Internal DC braking: Enabled (The braking
02
operates only with the set braking frequency.)
01 Enables the speed servo-lock.
02 Enables the position servo-lock.
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.
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
Controls with the servo-on mode using the [SON]
terminal.
054
OFF: Servo lock is disabled.
ON: Servo lock is enabled.
08 Sensorless vector control
09 Zero-speed range sensorless vector control
10 Vector control with sensor
Inverter Function
Description