Hitachi SJ300 Series - Manual (Page 15)

Chapter 2 – Explanation of Functions
2.4 Torque bias
The inverter is able to accept an analog voltage signal from a load cell that represents car weight. This
signal is used to adjust the instantaneous starting torque to achieve smooth motion regardless of load.
Motor
LAD ASR ACR
Counterweight
HOLD
FW side gain
RV side gain
FW side balance
value110)
RV side balance value
Filter
Measure
Target f
Hold signal
O2
SSD
Changeover according to
the direction
Point A
Point B
Figure 4 – Torque bias circuit diagram
Cabin
Encoder
< Additional setting items>
Function
Code
Function Name Setting Range Remarks
A071
Selection of Torque Bias
Input
-
00: O Input
01: OI Input (Note 2)
02: O2 Input (Note 3)
P110 FW side balance value 0.0 - 10.0 (V)
Total weight output at balanced point
(FW direction side)
P111 RV side balance value 0.0 - 10.0 (V)
Total weight output at balanced point
(RV direction side)
P112 FW side gain 0.0 - 200.0 (%)
Torque value to be added in case of
max. weight (FW direction side)
P113 RV side gain 0.0 - 200.0 (%)
Torque value to be added in case of
max. weight (RV direction side)
P114 Time constant of the filter 5 - 500 (ms)
C001
- C008
Intelligent input
terminals 1 - 8
- 50: SSD
Note 1: Do not configure the same analog input for torque bias input (A071), frequency source setting
(A001), and torque limit input (B040).
Note 2: When OI input is used for torque bias, the ranges of P110 and P111 are still 0 – 10 V, so it will be
necessary to translate the 4 – 20 mA signal value to 0 – 10 V for these parameter settings.
Note 3: When O2 is selected for torque bias, the range is 0 to +10 V. Negative values are ignored.
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