Torque Limit - Hitachi SJ300 Series Instruction Manual

Torque Limit

The Torque Limit function limits the motor output torque for sensorless vector control, sensor-
less vector control 0Hz domain, or vector control with feedback.
In the torque limit function, the following operational modes are available (selected by B040):
1. Four-quadrant individual setting mode – This mode sets torque limit in 4 zones, forward
2. Terminal selection mode – By use of torque limit select intelligent input terminals 1 and 2,
3. Analog input mode – This mode sets torque limit value by the voltage applied to terminal
4. Expansion Cards 1 and 2 – This function is valid when using the expansion card (SJ-DG).
When the torque limit enable function [TL] is assigned to an intelligent input terminal, torque
limiting occurs only when [TL] is ON. When the [TL] input is OFF, the inverter always uses the
default torque control limit of 200% maximum. That torque limit value corresponds to 200% of
the maximum inverter output current. Therefore, the output torque also depends on the particu-
lar motor in use. When the over-torque output [OTQ] is assigned in the intelligent output selec-
tion, it turns ON when the inverter is performing torque limiting.
Note 1: Unavailable for A344
Note 2: Unavailable for A244 and A344
driving and regenerating, reverse driving and regenerating. Limits for each quadrant are set
with B041 – B044 individually.
this mode changes and uses torque limits 1 – 4 set in B041 – B044. Selected torque limit
range is valid in all four quadrants.
[O2] (referenced to [L] for ground. An input of 0 – 10V corresponds to the torque limit
value of 0 to 200%. The selected torque limit value is valid in all four quadrants (whether
forward or reverse move, driving or regenerating).
Please refer to the SJ-DG instruction manual.
Code Function
A044 / Control method
A244 selection
B040
Torque limit
selection
B041 Torque limit 1
B042 Torque limit 2
B043 Torque limit 3
B044 Torque limit 4
C001 Intelligent input
to terminal [1] to [8]
C008 function
C021 Intelligent output
to terminal [11] to [15]
C025 function
Data or Range
00 V/f Constant torque
01 V/f Variable torque
02 V/f Free-setting torque *1
03 Sensorless vector *1
04 Sensorless vector, 0 Hz domain *1
05 Vector control with sensor *2
00 4-quadrant individual setting
01 Terminal selection
02 Analog [O2] input
03 Expansion card 1
04 Expansion card 2
0 to 200% Forward-driving in 4-quadrant mode
0 to 200% Reverse-regenerating in 4-quadrant
mode
0 to 200% Reverse-driving in 4-quadrant mode
0 to 200% Forward-regenerating in 4-quadrant
mode
40 Torque limit enable
41 Torque limit selection, bit 1 (LSB)
42 Torque limit selection, bit 2 (MSB)
10 In torque limit
4–37
SJ300 Inverter
Description