Functions
8.19 Closed-loop Vdc control
Control Units CU240S
8-140 Operating Instructions, 11/2006, A5E00766042B AA
In addition to controlling the DC link (closed-loop), the Vdc_max controller supports the
stabilizing processes of the speed at the end of an acceleration phase. This is especially the
case if there is an overshoot and the motor therefore briefly goes into regenerative operation
(damping effect).
Note
If the DC link voltage exceeds the power-on threshold r1242 (switch-on level of Vdc_max.) of
the Vdc_max controller in the "Ready" state, then the Vdc_max controller is de-activated and
warning A0910 is output.
Cause:
The line supply voltage does not match the application situation
Remedy:
Refer to parameters P1254 and P0210.
If, in the "Run" state, the DC link voltage exceeds the power-on threshold r1242 and if the
Vdc_max controller output is limited by parameter P1253 for approx. 200 ms, then the
Vdc_max controller is de-activated and the warning A0910 and, where relevant, fault F0002
are output.
Cause:
Line supply voltage P0210 or ramp-down time P1121 too low
The moment of inertia of the motor load is too high
Remedy:
Refer to parameters P1254, P0210, P1121
Use a braking resistor
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