Hitachi SJ Series, User Manual

Page: 198 / 786

12-6-3
Chapter 12 Inverter Functions
12.6.3 Limit output direction.
• Want to prevent damage of the machine due to
reverse rotation of the motor.
• Under some control, output at a low speed in the
direction opposite to the one specified in the
operation command may occur. The output can be
restricted in the direction specified in the operation
command if the reverse rotation prevention
function selection [HC114] is used.
• Enable the reverse rotation prevention function
selection if the reverse rotation of the motor could
give damage to the connected machine.
• This function is enabled when the control method
[AA121] is set to 08 (sensorless vector control), 09
(sensorless vector control in zero speed range), or
10 (vector control with sensor).
• Even if this function is used, the motor may rotate
in the reverse direction under a high-load external
force applied in that direction. If you use this
function to limit the operation direction, make sure
that the motor would not make reverse rotation.
Item Parameters Data Description
Control method
selection
[AA121]
08 Sensorless vector control
09 Sensorless vector control in zero speed
range
10 Vector control with sensor
Selection of reverse
rotation prevention
function
[HC114]
00 Disabled
01 Enabled
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