Commissioning via the built-in BOP
5.6 Function commissioning
SINAMICS V20 Converter
100 Operating Instructions, 10/2019, A5E34559884-012
Setting parameters
P1237 Dynamic braking This parameter defines the rated duty cycle of the braking
resistor. Dynamic braking is active when the function is ena-
bled and DC-link voltage exceeds the dynamic braking switch-
on level.
= 0: Disabled (factory default)
= 1: 5% duty cycle
= 2: 10% duty cycle
= 3: 20% duty cycle
= 4: 50% duty cycle
= 5: 100% duty cycle
This parameter is only applicable for converters of
frame size D and E. For frame sizes AA to C, the duty cycle of
the braking resistor can be selected with the dynamic braking
P1240[0...2] Configuration of Vdc controller This parameter enables/disables Vdc controller.
= 0: Vdc controller disabled
This parameter must be set to 0 (Vdc controller disa-
bled) to activate the dynamic braking.
P1254 Auto detect Vdc switch-on levels This parameter enables/disables auto-detection of switch-on
levels for Vdc_max controller.
= 0: Disabled
= 1: Enabled (factory default)
It is recommended to set P1254 = 1 (auto detection of Vdc
switch-on levels enabled). Note that auto detection only works
when the converter has been in standby for over 20s. When
P1240 = 0, P1254 is only applicable for frame size D and E
Risks with the use of inappropriate braking resistors
Braking resistors, which are to be mounted on the converter, must be designed so that they
can tolerate the power dissipated. If an unsuitable braking resistor is used, there is a
danger of fire and the associated converter will be significantly damaged.
Motor holding brake
The motor holding brake prevents the motor from undesirable turning when the power supply
of the converter is switched-off. The converter has internal logic to control the motor holding
brake.
To Next Page
Loading...
