Omron SYSDRIVE 3G3RV, User Manual

Page: 256 / 446

6
-40
Machine Protection
This
section explains functions for protecting the machine.
K K K K
Limiting Motor Torque (Torque Limit Function)
The
motor torque limit function is enabled only in open-loop vector control. The output torque to the motor is
calculated
internally in open loop vector control. The Torque Limit Function limits this internal torque value
to
output within a user set value.
This
function is used when a load can handle only limited torque, or when limiting the regeneration amount.
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Related Parameters
Multi-function Analog Input (H3-09)
Note The
forward torque limit is the limit value when the analog input signal generates forward torque. This torque limit setting is enabled even when the
analog
input signal generates forward torque while the motor is operating (regeneration).
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Setting the Torque Limit in Parameters
Using
L7-01 to L7-04, you can set individually four torque limits in the following directions: Forward drive,
reverse
drive, forward regeneration, and reverse regeneration.
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Set the Torque Limit Value Using an Analog Input
You
can change the analog input level torque limit value by setting the torque limit in multi-function analog
input
terminal A2.
The
analog input terminal signal level is factory-set as follows:
Multi-function
analog input terminal A2: 4 to 20 mA (20 mA at input, torque limited to 100% motor rated
torque).
The following diagram shows the relationship between the torque limits.
Param-
eter
Num-
ber
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f
with
PG
Open
Loop
Vec-
tor
LCD Display
L7-01
Forward
drive torque limit
Set
the torque limit value as a percent of the motor
rated
torque.
You
can set up to four separate limits.
0
to 300
200% No No No A
Torq
Limit Fwd
L7-02
Reverse
drive torque limit
0
to 300
200% No No No A
Torq
Limit Rev
L7-03
Forward
regenerative
torque
limit
0
to 300
200% No No No A
Torq
Lmt Fwd Rgn
L7-04
Reverse
regenerative
torque
limit
0
to 300
200% No No No A
Torq
Lmt Rev Rgn
Set
Value
Function 100% of Contents
Control Methods
V/f
V/f
with
PG
Open
Loop
Vec-
tor
10 Positive
torque limit
Motor
rated torque
No No Yes
11 Negative
torque limit
Motor
rated torque
No No Yes
12 Regenerative
torque limit
Motor
rated torque
No No Yes
15 Positive/negative
torque limit
Motor
rated torque
No No Yes
Output torque
Positive torque
Regenera-
tive status
Regenera-
tive status
No. of motor
rotations
Reverse
Negative torque
Forward