Using Intelligent Input Terminals
Oper
ations
a
nd Moni
tor
ing
4–30
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.
NOTE:
The Overload Advance Notice function for intelligent outputs is related to Overload
Restriction operation, discussed in
“Overload Advance Notice Signal” on page 4–46
.
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. Three intelligent inputs
control the Torque Limit function:
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.
Overload
restriction level
Maximum
frequency
Output
frequency
Target frequency
Deceleration rate at overload restriction
Deceleration rate
at overload restriction
A004
F001
B022 / B025
B023 / B026
B022 / B025
t
Opt. Code
and
Symbol
40=[TL]
41=[TRQ1]
42=[TRQ2]
Valid for
Inputs
[1] to [8]
Required
Settings
B040, B041,
B042, B043,
B044
Default
terminal
Requires
config.
Symbol
Function Name
Description
TL
Torque limit enable
Enables torque limit function when ON
TRQ1
Torque limit select 1, Bit 1 (LSB)
Binary encoded bit for quadrant select
TRQ2
Torque limit select 2, Bit 2 (MSB)
Binary encoded bit for quadrant select
Intelligent
Inputs
Torque limit
parameter
TRQ2
TRQ1
OFF
OFF
B041
OFF
ON
B042
ON
OFF
B043
ON
ON
B044
