Omron SYSDRIVE 3G3FV, User Manual, Page: 191 / 400

6-17
Group Control mode Comments Function Group
Flux
Vector
Open-loop
Vector
V/f
w/PG
V/f
Comments Function
Terminal H1 Digital Inputs Function selection for multi-function inputs OK OK OK OK e a
H2 Digital Outputs Function selection for multi-function outputs OK OK OK OK
H3 Analog Inputs Adjustment/function selection for external analog inputs OK OK OK OK
H4 Analog Outputs Adjustment/function selection for multi-function analog
outputs OK OK OK OK
H5 Serial Com Setup Not Used. (Do not change this setting.) --- --- --- ---
Protection L1 Motor Overload Sets electrical/thermal functions that protect the motor. OK OK OK OK o ec o
L2 PwrLoss Ridethru Selects the power-loss processing method. OK OK OK OK
L3 Stall Prevention Accel/Decel stall prevention settings and selection OK OK OK OK
L4 Ref Detection Frequency detection settings and selection OK OK OK OK
L5 Fault Restart Fault restart function settings OK OK OK OK
L6 Torque Detection Sets overtorque detection functions 1 and 2 (by current) OK OK OK OK
L7 Torque Limit
S
Torque limit function settings --- --- OK OK
L8 Hdwe Protection Hardware overheating and phase loss protection settings OK OK OK OK
Operator o1 Monitor Select Selects the Operator’s display and setting methods. OK OK OK OK O e a o
o2 Key Selections Operator’s key function selection and other parameters OK OK OK OK
6-3-2 Droop Control Function
Droop control is a function that allows the user to set the amount of motor slip. When a single load is
operated with two motors (such as in a crane conveyor), a high-resistance motor (a motor in which the
secondary winding’s resistance is increased resulting in an increased amount of slip) is normally used
to adjust the load balance, as shown in the following diagram.
The balance of the load is very different with different amounts of slip.
Torque
Load torque
Motor A’s torque
characteristics
Motor B’s torque
characteristics
Speed Reference
speed
•
Load balance when using a general-purpose motor
Torque
Load torque
Motor A’s torque characteristics
Speed
Reference
speed
•
Load balance when using a high-resistance motor
Motor B’s torque characteristics
T
A
T
B
T
A
T
B
T
A
–T
B
>>0
T
A
–T
B
'
0
If droop control is used, a high-resistance motor’s characteristics can be set for a general-purpose mo-
tor. Also, it is easy to make adjustments while watching the load balance because the amount of slip can
be set arbitrarily.
Set the amount of slip in parameter b7-01 as the percentage of slip when the maximum frequency is
input and the rated torque is generated. Droop control is disabled if b7-01 is set to 0.0.
Advanced Operation
Chapter 6