Omron VARISPEED F7 User Manual

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6
Set the Torque Limit Value Using an Analog Input
The analog input A2 can be used to input several torque limits. The table below shows the possible analog
input settings (H3-09) for the torque limit function.
The analog input terminal A2 signal level is factory-set as follows: 4 to 20 mA (i.e. if 20 mA are input the
torque is limited to 100% of the motor rated torque). Fig 6.49 shows the relationship between the torque lim-
its.
Fig 6.49 Torque Limits using the Analog Input
Setting Torque Limits Using Parameters and an Analog Input Together
The following block diagram shows the relationship between torque limit using parameters (L7-01 to L7-04)
and torque limit using the analog input A2.
Fig 6.50 Torque Limit Using Parameters and an Analog Input Together
 Enabling Integral Torque Limit Operation (L7-06 and L7-07)
In Open Loop Vector control an integral operation can be applied to the torque limit function (P-control is
standard). This improves the torque limit accuracy and smoothes the torque limit operation. To enable the inte-
gral operation set parameter L7-07 to 1. The integral time constant can be set in parameter L7-06.
Set
Value
Function 100% of Contents
Control Methods
V/f
V/f
with
PG
Open
Loop
Vector
Closed
Loop
Vector
10 Positive torque limit Motor rated torque No No Yes Yes
11 Negative torque limit Motor rated torque No No Yes Yes
12 Regenerative torque limit Motor rated torque No No Yes Yes
15 Positive/negative torque limit Motor rated torque No No Yes Yes
Output torque
Positive
Positive/negative torque limits
Forward torque limit
Regenerative torque limit
Reverse operation
No. of motor rotations
Forward operation
Regenerative torque limit
Negative torque limit
Positive/negative torque limits
Negative
Multi-function analog input
Terminal
A2
Forward torque limit
(set value = 10)
Negative torque limit
(set value = 11)
Regenerative torque limit (set
value = 12)
Positive/negative torque limit (set
value = 15)
Positive forward drive
torque
Reverse positive regenerative torque
Forward negative regenerative torque
Reverse
drive reverse
torque
Min: Minimum value priority circuit
Parameters
Forward torque limit (L7-01)
Reverse torque limit (L7-02)
Forward regenerative torque
limit (L7-03)
Reverse regenerative torque
limit (L7-04)
175% of Inverter rated current
Forward torque limit
Reverse torque limit
Forward regenerative
torque limit
Reverse regenerative
torque limit

Omron VARISPEED F7 Specifications

General

Brand	Omron
Model	VARISPEED F7
Category	Inverter
Language	English