Omron VARISPEED G7 Instruction Manual page 313

Torque compensation
from analog input
Torque reference
from analog input
Speed limit from analog
input from terminal A1
Speed limit
d5-04
Speed limit bias
d5-05
Speed feedback
Speed Limiter and Priority Circuit (Speed Limit Function)
If the external torque reference and load are not balanced during torque control, the motor will accelerate in
either the forward or reverse direction. The speed limit function is used to limit the speed to a specified value
and it consists of the speed limiter circuit and priority circuit. The speed limit circuit
Application Precautions
There are two ways to set a speed limit: using an input from an analog input terminal and setting a speed limit
in d5-04. The inputs methods for a speed limit are listed in the following table.
Speed Limit Input Method
Voltage input (0 to ±10 V)
Current input (4 to 20 mA)
Option Card (AI-4B)
(0 to ±10 V)
-118
6
Torque primary delay
filter d5-02
1
+
Speed controller
(ASR)
−
2
d5-03
Speed limiter
Fig 6.64 Torque Control Block Diagram
Location of Refer-
ence
Set in d5-04
Between A1 and AC
Between A2 and AC
Between A2 and AC
Between TC1 and TC4
+
Priority
Torque limit
circuit
+
+
Refer to torque limit setting
via constants and analog input
Constant Set-
tings
d5-03 = 2 -
Set H3-01 to 0 if the speed limit is always
b1-01 = 1
to be positive.
H3-01 = 1
The value will be added to the value input
on A1 to determine the speed limit.
b1-01 = 0
Set H3-03 to 0 if the speed limit input on
H3-08 = 1
A2 is always to be positive.
H3-09 = 1
Turn OFF (V side) pin 2 of DIP switch S1
on the terminal board.
The value will be added to the value input
b1-01 = 0
on A1 to determine the speed limit.
H3-08 = 2
Turn ON (I side) pin 2 of DIP switch S1
H3-09 = 1
on the terminal board.
If H3-09 is set to 0, the sum of the input
b1-01 = 3 between TC2 and TC4 will be added the
F2-01 = 0 input between TC1 and TC4 to determine
the speed limit.
Internal torque
reference
Remarks