Applications; Cranes; Crushers; Mills - Omron SX-F Instruction Manual

6-1

Applications

6-1-1

Cranes

Challenge
Starting with heavy load is difficult and risky.
Can lead to jerks causing swinging load.
Jerky movements can cause load to be
dropped, jeopardizing safety of people and
goods.
Crane is driven slowly when returning empty or
with light load. Valuable time is lost.
Braking with heavy load is difficult and risky.
Can lead to jerks causing swinging load.
Operator starts braking long before end posi-
tion to avoid jerks. Valuable time is lost.
6-1-2

Crushers

Challenge
High start currents require larger fuses and
cables, or for mobile crushers larger diesel gen-
erators.
Difficult to start with heavy load.
Material that could cause damage gets into the
crusher.
Process inefficiency due to e.g. broken feeder or
worn jaw. Wasted energy, mechanical stress,
and risk of process failure.
6-1-3

Mills

Challenge
High start currents require larger fuses and
cables. Cause stress on equipment and higher
energy cost.
Difficult to start with heavy load.
Material that could cause damage gets into the
mill.
Process inefficiency due to broken or worn
equipment. Energy wasted and risk of process
failure.
This chapter contains tables giving an overview of many different applications/
duties in which it is suitable to use variable speed drives from OMRON. Fur-
ther on you will find application examples of the most common applications
and solutions.
Direct torque control, fast motor pre-magnetiza-
tion and precise brake control gives instant yet
soft start with heavy load.
Deviation control immediately detects load
change. Signals to parallel safety system to
activate mechanical brakes.
Speed can be increased by field weakening.
Direct torque control and vector brake gradually
reduce speed to zero before mechanical brake
is activated.
System automatically stops crane at end posi-
tion. Operator can safely drive at full speed.
Direct torque control reduces start current.
Same fuses as those for the motor, or smaller
generator.
Possible to boost torque at start to overcome
initial torque peak.
Load Curve Protection quickly detects devia-
tion. Warning is sent or safety stop activated.
Load Curve Protection quickly detects devia-
tion from normal load. Warning is sent or
safety stop activated.
Direct torque control reduces start current.
Same fuses can be used as those required for
the motor.
Possible to boost torque at start to overcome
initial torque peak.
Load Curve Protection quickly detects devia-
tion. Warning is sent or safety stop activated.
Load Curve Protection quickly detects devia-
tion. Warning is sent or safety stop activated.
Omron SX-F solution
Omron SX-F solution
Omron SX-F solution
SECTION 6
Applications
Menu
331–338, 339, 351
3AB, 3AC
343, 3AA, 3AD, 713
213, 33E,33F, 33G
3A2–3AA
Menu
331-338, 351
351–353
411–41C9
411–41B, 41C1–41C9
Menu
331-338, 350
351–353
411–41C9
411–41B, 41C1–41C9
51