Hitachi L700 Series

Chapter 4 Explanation of Functions
4 - 94
When "00" (quadrant-specific setting mode) is specified for the torque limit selection (b040), the torque
limits 1 to 4 apply as shown below.
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 Function code Data Description
V/F characteristic curve
selection
A044/A244 03 Sensorless vector control
Reverse Run protection
enable
b046
00 Disabling counterrotation prevention
01 Enabling counterrotation prevention


Tor q ue
Regeneration
(b042)
Powering
(b043)
Powering (b041)
Regeneration
(b044)
Reverse rotation
(RV)
Forward rotation
(FW)
Intelligent input terminals
A044/A244: V/F characteristic curve
selection, 1st/2nd motors
b046: Reverse Run protection enable
Related code
b041
b042
b044
b043