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Power failure bridging

Power failure bridging for speed and position control

There are a variety of setting options for power failure bridging in closed-loop controlled mode.



Setting: P 02949 SRLWR(1) and SRLOR(2)
Addition of P 2944 (software shut-off limit) and
P 2942(1) = voltage reference value.
The resultant voltages must not be greater than the detection limit.


Setting:P 2940 = SRLWOR(3):
Addition of P 2945 (brake chopper switch-on threshold) and P 2942(1) (voltage reference value).
The voltage must not fall below 95% of the brake chopper switch-on threshold.

If the mains power is restored within this time, in speed control a restart is effected with the parameterized speed ramp from the profile generator.

In position-controlled mode the speed is run down to zero with the preset quick-stop ramp.
If the mains power is not restored within the preset time, an error message is generated. The system reacts according to the error reaction (Fault 34 Reac_PowerFail).




 

Parameters

P. no. Parameter name Function
P2940 CON_PowerFail Selector
(0) Off(0) No function
(1) SRLWR(1) Longest possible speed reduction with restart
(2) SRLWOR(2) Longest possible speed reduction without restart
(3) SRLWOR(3) Fastest possible speed reduction without restart.
P2941 CON_POWF_VCtrl Voltage controller changeable online
(0) Kr Gain factor of PI voltage controller
(1) Tn Integral-action time of PI voltage controller
P2942 CON_POWF_VLim Voltage limit in case of power failure
(0) POWF_Von Power failure detection limit
(1) POWF_VRef Voltage reference value
P2943 CON_POWF_RetTime Setting of time window in which mains power can be restored
P2944 CON_POWF_UdcOff Software shut-off limit for detection of DC link undervoltage
P2945 CON_POWF_UbcOn Brake chopper switch-on threshold

Tabelle: Mode selector for speed reduction


Power failure bridging