Hitachi SJ7002 Series Instruction Manual page 191

4–30
Using Intelligent Input Terminals
Torque Limit
40=[TL]
Opt. Code
41=[TRQ1]
and
Symbol
42=[TRQ2]
Valid for
[1] to [8]
Inputs
B040, B041,
Required
B042, B043,
Settings
B044
Default
Requires
config.
terminal
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The figure below shows the operation during an overload restriction event. The overload
restriction level is set by B022 and B025. The overload restriction constant is the time to decel-
erate to 0Hz from maximum frequency. When this function operates, the acceleration time will
be longer than the normal acceleration time.
Output
frequency
Overload
restriction level
Deceleration rate
at overload restriction
Maximum
frequency
NOTE: The Overload Advance Notice function for intelligent outputs is related to Overload
Restriction operation, discussed in
The Torque Limit function limits the motor output torque for sensorless vector control, sensor-
less vector control 0Hz domain, or vector control with feedback. Three intelligent inputs
control the Torque Limit function:
Symbol Function Name
TL Torque limit enable
TRQ1 Torque limit select 1, Bit 1 (LSB)
TRQ2 Torque limit select 2, Bit 2 (MSB)
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
driving and regenerating, reverse driving and regenerating. Limits for each quadrant are set
with B041 – B044 individually.
2. Terminal selection mode – By use of torque limit
select intelligent input terminals 1 and 2, this mode
changes and uses torque limits 1 – 4 set in B041 –
B044. Selected torque limit range is valid in all four
quadrants. Inputs TRQ1 and TRQ2 apply only to
terminal selection mode.
3. Analog input mode – This mode sets torque limit value
by the voltage applied to terminal [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).
4. Expansion Cards 1 and 2 – This function is valid when using the expansion card (SJ-DG).
Please refer to the SJ-DG instruction manual.
B022 / B025
A004
Deceleration rate at overload restriction
B023 / B026
"Overload Advance Notice Signal" on page
Enables torque limit function when ON
Binary encoded bit for quadrant select
Binary encoded bit for quadrant select
B022 / B025
F001
Target frequency
t
4–46.
Description
Intelligent
Torque limit
Inputs
parameter
TRQ2 TRQ1
OFF OFF B041
OFF ON B042
ON OFF B043
ON ON B044