Beckhoff AG2250, Operating Instructions Manual

Page: 85 / 95

Commissioning
Version: 2.8 ─── 85 AG2250
Avoid overloading
Motors and gear units often have different operating areas. With
higher transmission ratios the gear unit may be overloaded due to
multiplication of the motor torque. In this case, the rated motor
torque and/or the peak motor torque must be limited.
Failure to limit this can result in overloading and damage to the
gear unit.
Observe the operating instructions for the motors
For commissioning, read the original operating instructions for the
motors used and follow the steps according to the chapter "Com-
missioning".
Commissioning example
The procedure for commissioning is described as an example. A
different method may be appropriate or necessary, depending on
the application of the components.
Example:
Limitation of rated motor current and peak motor current.
Calculation based on the rated motor current:
Standstill torque M
0
of the motor: 1 Nm
Rated torque T
2N
of the gear unit: 8 Nm
Output torque of the gear unit with a transmission ratio i of 10:
1 Nm x 10 =
10 Nm
Result: The rated motor current must be limited to 80%.
Calculation based on the peak motor current:
Standstill torque M
pmax
of the motor: 5 Nm
Maximum acceleration torque T
2B
of the gearbox: 20 Nm
Output torque of the gear unit with a transmission ratio i of 10:
5 Nm x 10 =
50 Nm
Result: The peak motor current must be limited to 40%.
Relevant parameters
Servo drive Rated current Peak current
AX5000 P-0-0093 "Configured channel current" P-0-0092 "Configured channel peak cur-
rent"
AX8000 "Configured channel rated current" "Configured channel peak current"
Servo terminal 0x7010:0B "Torque limitation" 0x2003:11 "Max current"