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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.
nRelated Parameters
Param-
eter
Num-
ber
Forward drive torque limit
L7-01
Torq Limit Fwd
Reverse drive torque limit
L7-02
Torq Limit Rev
Forward regenerative
torque limit
L7-03
Torq Lmt Fwd Rgn
Reverse regenerative
torque limit
L7-04
Torq Lmt Rev Rgn
Multi-function Analog Input (H3-09)
Set
Value
10
Positive torque limit
11
Negative torque limit
12
Regenerative torque limit
15
Positive/negative torque limit
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).
nSetting 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.
nSet 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.
-40
6
Name
LCD Display
Set the torque limit value as a percent of the motor
rated torque.
You can set up to four separate limits.
Regenera-
Reverse
tive status
Function
Setting
Description
Range
0 to 300
0 to 300
Output torque
Positive torque
No. of motor
0 to 300
rotations
Regenera-
Forward
tive status
Negative torque
0 to 300
100% of Contents
Motor rated torque
Motor rated torque
Motor rated torque
Motor rated torque
Control Methods
Change
Factory
during
V/f
Setting
Opera-
V/f
with
tion
PG
200%
No
No
No
200%
No
No
No
200%
No
No
No
200%
No
No
No
Control Methods
V/f
V/f
with
PG
No
No
No
No
No
No
No
No
Open
Loop
Vec-
tor
A
A
A
A
Open
Loop
Vec-
tor
Yes
Yes
Yes
Yes
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Troubleshooting
