Torque Limit Function - Omron SYSDRIVE 3G3FV User Manual

Advanced Operation
Group Group Function Function
Terminal e a H1 Digital Inputs
H2 Digital Outputs
H3 Analog Inputs
H4 Analog Outputs
H5 Serial Com Setup
Protection o ec o L1 Motor Overload
L2 PwrLoss Ridethru
L3 Stall Prevention
L4 Ref Detection
L5 Fault Restart
L6 Torque Detection
L7 Torque Limit
L8 Hdwe Protection
O e a o Operator o1 Monitor Select
o2 Key Selections

6-1-2 Torque Limit Function

With open-loop vector control, the torque limit can be applied at an arbitrary value be-
cause the torque output by the motor is calculated internally.
The torque limit function is useful when the load cannot sustain a torque above a certain
level or regenerative torque above a certain level. The two ways to apply a torque limit
are listed below. (The lower torque limit will be used if both of these methods are set.)
1) Setting a torque limit with the parameters
2) Limiting torque with the analog inputs
The precision of the torque limit is 5% for output frequencies above 10 Hz, but the preci-
sion is lower for output frequencies below 10 Hz. Use flux vector control if you want to
apply a torque limit at low-speed (below 10 Hz).
H Setting a Torque Limit with Parameters
Torque limits can be set separately for the 4 ways that torque can be applied: forward torque, reverse
torque, forward regenerative torque, and reverse forward regenerative torque. These parameters can-
not be changed during operation.
Parameter Display name p y
number
L7-01 Torque Limit Fwd
L7-02 Torque Limit Rev
L7-03 Torque Limit Fwd Rgn
L7-04 Torque Limit Rev Rgn
Comments Comments
Function selection for multi-function inputs
Function selection for multi-function outputs
Adjustment/function selection for external analog inputs
Adjustment/function selection for multi-function analog
outputs
Not Used. (Do not change this setting.)
Sets electrical/thermal functions that protect the motor.
Selects the power-loss processing method.
Accel/Decel stall prevention settings and selection
Frequency detection settings and selection
Fault restart function settings
Sets overtorque detection functions 1 and 2 (by torque)
S Torque limit settings
Hardware overheating and phase loss protection settings
Selects the Operator's display and setting methods.
Operator's key function selection and other parameters
Setting g Units Default
range
0 to 300 %
Valid access levels
setting
V/f V/f with
Control PG
200 Not applicable
Chapter 6
Control mode
V/f V/f Open-loop Flux
w/PG Vector Vector
OK OK OK OK
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OK OK OK OK
OK OK OK OK
OK OK OK OK
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Open Loop Flux
Vector Vector
Basic or Advanced
6-3