35
ServoA
Operation Manual
Electrical installation
ID no.: LDS-O-SA-EN-202103
drive controller power stage is shut down and the motor current is 0. This is
done by inserting appropriate safety times for switching of the motor contac-
tor in the control sequence of your machine.
Despite these measures, the possibility cannot be ruled out that the drive
controller may malfunction during switching in the motor cable.
3.12 Braking resistor (RB)
In regenerative operation, e.g. when braking the drive, the motor feeds energy back to
the drive controller. This increases the voltage in the DC link. If the voltage exceeds a
threshold value, the internal braking transistor is activated and the regenerated power is
converted into heat by means of a braking resistor.
3.12.1 Protection in case of braking chopper fault
ATTENTION!
If the internal braking chopper transistor is permanently
switched on, because it is alloyed through by overload (= 0 Ω), there is a
protective function to protect the device against overheating.
You activate this function by assigning any digital output (DriveMan-
ager 5
►
subject area "Configuration of the inputs/outputs"
►
Digital
outputs
►
OSD00 to OSD02) BC_FAIL(56). In the event of a fault the selected
output then switches from 24 V to 0 V. This signal ensures that the drive
controller is safely disconnected from the mains supply.
3.12.2 Design with integrated braking resistor
The catalogue only specifies the peak braking power for the drive controllers with inte-
grated braking resistor. The permissible continuous braking power must be calculated.
It depends on the effective loading of the controller in the corresponding application.
The drive controller is thermally designed in such a way that no energy input by the
internal braking resistor is permitted during continuous operation with rated current and
at maximum ambient temperature.
Consequently, a controller design featuring an integrated braking resistor only makes
!
Ready made-up motor cable
Order code
PLH2
PMM2
-
xxxx
-
xx
-
xxx
PLH2 applies to LSML
PMM2 applies to LSMM
Cable diameter
Cable type
Cable length (m)
Motor cable
Order code
3.11.2 Electronic overload protection for the motor
The motor protection function acquires the motor frequency, the motor current and
other parameters. Depending on these parameters and the rated motor current, the
motor protection triggers the overload protection function:
•
As I
2
T monitoring with programmable motor current, the permissible multiple of the
rated motor current, the trigger time and the speed-dependency of the rated motor
current.
•
The I
2
T integrator acts as a thermal memory of the system. The thermal memory is
retained while the motor is shut down and if the device is switched on.
•
The devices do not retain the thermal memory if switched off, i.e. the electronic mo-
tor overload protection is reset by switching off the power supply.
The electronic motor overload protection can be increased by using a motor tempera-
ture sensor.
3.11.3 Switching in the motor cable
ATTENTION!
Switching in the motor cable must take place with the power
cut and the power stage disabled, as otherwise problems such as burned-
off contactor contacts may occur. In order to ensure unpowered switch-on,
you must make sure that the contacts of the motor contactor are closed be-
fore the drive controller power stage is enabled. At the moment the contac-
tor is switched off it is necessary for the contact to remain closed until the
!
Содержание ServoA SA52.0100
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