Dc Link Buffering And Monitoring Of Generator Minimum Speed Limit; Dc Link Buffering - Siemens SINUMERIK 840C Installation Instructions Manual

12 Functional Descriptions

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.
DC link voltage
600V/625V
Drive MD 1633
Drive MD 1632
Drive MD 1631
Drive MD 1634
280V
Actual speed value
n_GEN
Drive MD 1635
Generator operation
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
12–218
ZK2 message:
DC link generator active
ZK2 message:
Generator speed < drive MD 1635
© Siemens AG 1992 All Rights Reserved
10.94
ZK2 message:
DC link voltage > drive
MD 1634
t
t
6FC5197- AA50
SINUMERIK 840C (IA)