Mitsubishi Electric FR-A700 Technical Manual page 392

[Action time chart]
Position loop
Orientation
speed
Origin
Creep
switchover
Creep
position
speed
Position loop
switchover
position
*1 When the orientation command is OFF with the start signal ON, the speed accelerates to the command speed.
*2 If the hunting of the motor shaft occurs, set a larger value in [Pr.354 Position loop switchover position] or a smaller value
in [Pr.352 Creep speed] to prevent it.
*3 DC injection brake operates when orientation stop is made. Release the DC injection brake in a time as short as
possible (within several seconds) since continuous operation of the DC injection brake will cause the motor to
overheat, leading to burnout.
*4 Since no servo lock function is available after orientation stop, provide a holding mechanism such as mechanical
brake or knock pin when secure holding of a main spindle is required.
*5 When orientation control is performed, orientation can not be completed if DC injection brake operation is not set in
the DC injection brake adjusting (voltage, frequency, speed, time) parameters. Always set the DC injection brake
enabled.
*6 When [Pr.11 DC injection brake operation time = 8888] (DC injection brake external selection), DC injection brake does
not operate if the X13 signal is not turned ON. Note that the DC injection brake is applied under orientation control
regardless of the X13 signal status.
Orientation from stop
After turning on the orientation command (X22),
turning ON the start signal will increase the motor
speed to the orientation speed set in [Pr.351
Orientation speed], then orientation operation same
as when "orientation during running" is performed.
Note that, DC injection brake is operated if the
position signal is within the DC injection brake
start position.
[Action time chart]
Main spindle speed
(encoder)
[Pr. 351]
[Pr. 352]
Start signal
OFF
(STF, STR)
OFF
Orientation
command (X22)
DC injection brake
Orientation
completion
signal (ORA)
Main spindle speed
(encoder)
[Pr. 351]
[Pr. 352]
Orientation
stop position
command Start signal (STF, STR)
DC injection
Orientation
brake
command (X22)
Current position signal
Origin signal
DC injection brake
Orientation
completion signal
(ORA)
Orientation speed
(orientation switchover speed)
Creep speed
(orientation deceleration ratio)
OFF
ON
OFF
ON
OFF OFF
ON
OFF
OFF
ON
1)
0
OFF
ON
Continuous multi-point orientation
Orientation command and orientation with STF/
STR ON(orientation in servo in status)
[Action time chart]
Main spindle
speed (encoder)
[Pr. 351]
[Pr. 352]
Start signal
Orientation
command
Orientation
completion
signal
Time
DY
Position signal
• Read 16 bit data (position data) at starting up of
terminal DY of the plug-in option FR-A7AX. 16 bit
data with the FR-A7AX is valid only when
terminal DY is ON.
• When the position signal is within the creep
switchover position, the speed starts up to the
creep speed not to the orientation speed.
• When the position signal is not within the creep
switchover position, the speed starts up to the
orientation speed.
• The DC injection brake is operated if the position
signal is within the DC injection brake start
position.
426
PARAMETER
Orientation speed (set with [Pr. 351])
Creep speed (set with [Pr. 352])
2)
3) 4)
ON
Creep switchover position
(set with [Pr. 353])
Position loop switchover
DC injection
(set with [Pr. 354])
brake start
position
Stop position command
(set with [Pr. 355])
OFF
ON
5)
OFF
ON
Orientation speed
(orientation switchover speed)
Creep speed
(orientation deceleration ratio)
ON
ON
Servo-in
Servo-in
ON
50ms or more is necessary
Position
command latch
Time
OFF
OFF
OFF
OFF
ON
Position
command latch