Hitachi SJ Series User Manual page 341

Chapter 12
12.14.9 Starting after applying servo-lock
Q
• How to start operation after having the rotating
motor stopped and secured it
A
• Before outputting the frequency to the motor,
perform the servo-lock to stop the motor rotating.
And then, start operation.
• To apply DC braking for starting (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 [AF109] DC braking time for starting to
other than 0.0
• If the DC braking for starting (servo-lock control) is
enabled, DC braking (servo-lock control) will be
performed after the operation command is given,
for the period of time set as DC braking time for
starting [AF109].
Example of a case where the servo-lock control at
starting is enabled
FW
DC braking (servo-lock
control)
Output
frequency
[AF109]
Parameter
Item
DC braking selection
Braking mode selection
DC braking time for
starting
Control mode
ON
Parameter Data
00
01
[AF101]
02
01
[AF102]
02
[AF109] 0.0~60.0(s)
08
[AA121] 09
10
12-14-14
!
• Depending on the set braking force, the carrier
frequency may automatically go down to protect
the inverter.
• 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: Zero-speed 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
• For [AA121] Control mode and [AA123] Vector
control mode selection, it is necessary to set .
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.
Description
Internal DC braking: Disabled
Internal DC braking: Enabled
Internal DC braking: Enabled (The braking operates
only with the set braking frequency.)
Enables the speed servo-lock.
Enables the position servo-lock.
Valid when the internal DC braking is enabled.
Starts the servo-lock when the operation command is
turned on.
Sensorless vector control
Zero-speed range
sensorless vector control
Vector control with sensor
Inverter Function