Application Manual CDA3000
5-65
5 Software functions
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5.3.4 _34 PF-Power
failure bridging
Note: The power failure bridging function should only be operated
with control modes SFC and FOR. When the power failure
bridging function is active the current-controlled startup
function is deactivated.
Parameters for power failure bridging
Power failure bridging selector 340-PFSEL
Function Effect
• After a power failure the
inverter module is powered
by the rotational energy of
the motor.
• A short-time interruption of
the mains voltage merely
causes a reduction in motor
speed, which is restored to
the original level when the
power is restored.
Parameter Function Value range FS Unit
340-PFSEL Power failure bridging selector see Table 5.38 0
341-PFVON DC-link switching threshold as from
which power failure bridging is active
32.xxx ð212 ... 408
34.xxx
ð425 ... 782
260
452
V
V
342-PFVRF DC-link control reference
32.xxx ð212 ... 408
34.xxx
ð425 ... 782
236
438
V
V
343-PFTIM Time span until check as from mains
power restoration
1 ... 10000 50 ms
351-PFC Power failure bridging active current
reference
0 ... 180 100 %
354-PFR Power failure bridging deceleration ramp 1 ... 999 999 Hz/s
Table 5.37 Parameters from subject area _34PF Power failure bridging
BUS KP/DM Function
0 OFF Power failure bridging off
1 NOFCT No function
2 RETRN Longest possible DC-link bridging with restart
3 NORET Longest possible DC-link bridging without restart
4 NOLIM Fastest possible DC-link controlled speed reduction
Table 5.38 Settings for 340-PFSEL
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