Mitsubishi Electric FR-A700 Series, Technical Manual

Page: 392 / 550

426
PARAMETER
z 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.
z Continuous multi-point orientation
Orientation command and orientation with STF/
STR ON(orientation in servo in status)
• 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.
*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
stop position
command
DC injection
brake
Position loop
switchover
position
Creep
switchover
position
Orientation
speed
Origin
Creep
speed
Position loop
Main spindle speed
(encoder)
[ Pr. 351 ]
[ Pr. 352 ]
Start signal (STF, STR)
Orientation
command (X22)
Current position signal
Origin signal
Orientation speed (set with [ Pr. 351 ])
Creep speed (set with [ Pr. 352 ])
Creep switchover position
(set with [
Pr. 353 ])
Position loop switchover
(set with [
Pr. 354 ])
DC injection
brake start
position
(set with [
Pr. 355 ])
Stop position command
0
DC injection brake
OFF OFF
ON
Orientation
completion signal
(ORA)
OFF OFF
ON
OFF
OFF
Time
ON
OFF
ON
1)
2)
3) 4)
5)
[ Action time chart ]
Orientation speed
(orientation switchover speed)
Creep speed
(orientation deceleration ratio)
Time
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Main spindle speed
(encoder)
[ Pr. 351 ]
[ Pr. 352 ]
Start signal
(STF, STR)
Orientation
command (X22)
DC injection brake
Orientation
completion
signal (ORA)
[ Action time chart ]
DY
Position signal
Servo-in
ON
ON
Position
command latch
50ms or more is necessary
Servo-in
ON ON
Position
command latch
Main spindle
speed (encoder)
[ Pr. 351 ]
[ Pr. 352 ]
Start signal
Orientation
command
Orientation
completion
signal
Orientation speed
(orientation switchover speed)
Creep speed
(orientation deceleration ratio)
[ Action time chart ]