Siemens SINUMERIK 840C - Manual (Page 993)

12 Functional Descriptions 10.94
12.19.5 DC link buffering and monitoring of generator minimum speed limit
12.20.5 DC link buffering and monitoring of generator minimum
speed limit
12.20.5.1 DC link buffering
An axis/spindle can buffer the DC link by means of generator-mode braking. This function can
be selected through appropriate parameterization of 611D machine data and activation of
generator operation by programming commands.
Generator operation
Drive MD 1634
600V/625V
ZK2 message:
DC link generator active
t
DC link voltage
Drive MD 1633
n_GEN
Drive MD 1632
Drive MD 1635
280V
Drive MD 1631
ZK2 message:
Generator speed < drive MD 1635
ZK2 message:
DC link voltage > drive
MD 1634
t
Actual speed value
When the DC link voltage drops below the minimum threshold value set in drive MD 1631, the
axis/spindle concerned switches from position-controlled or speed-controlled operation into an
operating mode controlled by the DC link. When the drive is braked (through input of speed
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SINUMERIK 840C (IA)