Hitachi SJ700-004LFU2, Instruction Manual

Page: 203 / 390

SJ700
2
Inverter
Oper
ati
ons
and Monitor
ing
4–41
High-speed 2 Zero Return:
1. Motor accelerates for specified
acceleration time to high zero-
return speed
2.
Motor runs at high zero-return
speed
3. Motor starts deceleration when
[ORL] signal turns ON
4. Motor runs in reverse direction at
low-speed zero-return speed
5. Motor starts deceleration to stop
when [ORL] signal turns OFF
6. Motor accelerates in forward
direction to low-speed zero return level
7. Inverter stops motor and sets position value to zero when next [Z] signal pulse occurs
Forward/Reverse
Drive Stop
The forward/reverse drive stop function prevents the motor from moving a load outside a
desired position range. The end of travel in each direction must cause the appropriate input
signal, [FOT] or [ROT], to turn ON. Typically a limit switch or proximity switch is used to
generate these signals.
If the [FOT] turns ON during forward rotation (or [ROT] turns ON during reverse rotation), the
inverter limits the motor torque to 10% in the current direction of travel.
Speed/Position
Control Select
Turn ON the [SPD] terminal input to perform speed control while in absolute position control
mode. The direction of rotation depends on the operation command (FWD or REV). When
switching from speed control to position control, be sure to verify the sign of the value set in
the operation command.
While the [SPD] terminal is OFF, the current position count remains at zero. If the [SPD]
terminal is turned OFF during motor operation, the control mode switches to position control
and pulse counting begins, starting from zero. If the target position value is also zero, the
inverter stops the motor at the current position. Otherwise, rotation continues until motor
rotation arrives at the target position.
Output
frequency
[ORG]
Position
0
High zero-return level
P071
[ORL]
Origin
1
2
3
4
P070 Low-speed zero-
return level
5
6 7
Opt. Code
and
Symbol
71=[FOT]
72=[ROT]
Valid for
Inputs
[1] to [8]
Required
Settings
none
Default
terminal
Requires
config.
Forward drive stop [ORL]
Reverse drive stop [ORG]
Inverter
Output to
motor
Load Fwd Rev
Opt. Code
73
Symbol
[SPD]
Valid for
Inputs
[1] to [8]
Required
Settings
A044=05,
P012
Default
terminal
Requires
config.
Output
frequency
Speed/position switching [SPD]
Position control
t
0
Speed control
Start of position counting
Target position
t