SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.

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.
Torque
Regeneration
(b042)
Powering (b041)
Reverse rotation
(RV)
Powering
(b043)
Regeneration
(b044)
Forward rotation
(FW)
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:
Intelligent input terminals
When applying the torque limitation function to the motor operation at low speeds, also use the overload
restriction function.
4.2.101 Reverse Run protection function
b041
b042
b044
b043
The reverse Run protection function is effective when "03"
(sensorless vector control), "04" (0Hz-range sensorless vector
control), or "05" (vector control with sensor) is specified for the V/F
characteristic curve selection (A044/A244).
Related code
A044/A244: V/F characteristic curve
selection, 1st/2nd motors
b046: Reverse Run protection enable
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
03 Sensorless vector control
V/F characteristic curve
A044/A244 04 0Hz-range sensorless vector control
selection
05 Vector control with sensor (not available for A244)
Reverse Run protection
00 Disabling counterrotation prevention
b046
enable
01 Enabling counterrotation prevention
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