Reverse Run Protection Function (A044, B046) - Hitachi L700 SERIES Instruction Manual

Chapter 4 Explanation of Functions
When "00" (quadrant-specific setting mode) is specified for the torque limit selection (b040), the torque
limits 1 to 4 apply as shown below.
Reverse rotation
(RV)
When "01" (terminal-switching mode) is specified for the torque limit selection (b040), the torque limits 1 to
4 are set as shown in the example below. The torque limits 1 to 4 are switched by the torque limit switches
1 and 2 assigned to intelligent input terminals.
(Example) When torque limit switch 1 (41) and torque limit switch 2 (42) are assigned to intelligent input
terminals [7] and [8], respectively:
When applying the torque limitation function to the motor operation at low speeds, also use the overload
restriction function.
4.2.99 Reverse Run protection function
The reverse Run protection function is effective when "03"
(sensorless vector control) is specified for the V/F characteristic
curve selection (A044/A244).
For control reasons, especially during motor operation at low speed, the inverter may output a frequency
that instructs the motor to rotate in the direction opposite to that specified by the operation command. If the
counterrotation of the motor may damage the machine driven by the motor, enable the counterrotation
prevention function.
Item
V/F characteristic curve
selection
Reverse Run protection
enable
Torque
Regeneration Powering (b041)
(b042)
Powering Regeneration
(b043) (b044)
Intelligent input terminals
Function code Data
A044/A244 03
00
b046
01
4 - 94
Forward rotation
(FW)
b041
b042
b044
b043
Related code
A044/A244: V/F characteristic curve
selection, 1st/2nd motors
b046: Reverse Run protection enable
Description
Sensorless vector control
Disabling counterrotation prevention
Enabling counterrotation prevention