GUIDA ALLA
PROGRAMMAZIONE
SINUS PENTA
361/486
C211 Max. Time of Continuous Supply for Braking Resistance
Function
This parameter determines the max. continuous operating time required for the braking
resistance. If the braking resistance is used for a time C211
without being activated, the
braking resistance command is automatically disabled for a time of inactivity set in C212.
C212 Duty Cycle Braking (Ton/(Toff+Ton))
Function
C212 = (Ton/(Ton+Toff))*100
This parameter determines the operating duty cycle al
lowed for the braking resistance. It is
expressed as a percentage and defines the time of inactivity of the braking resistance when
it is continuously operating for the max. time set in C211.
C213 Frequency Increase for Overvoltage Compensation – Smart Voltage Control SVC (Smart Voltage Control)
Function
If this parameter is set > 0, a value given by C213 * derivative_voltage_DC (expressed in
V/s) is summed up to the frequency currently set for the motor.
In that way, when DC voltage abruptly changes due to sudden variations of the
torque, the output frequency is promptly adjusted to compensate for voltage inc
avoid overvoltage conditions.
A value equal to 0.0200
ensures optimum operation in most applications; however, the
optimum value for this parameter is to be found by trial and error.
Example: Suppose that the DC-bus voltage increases by 3 V in 1 ms, such as 3000 V/s.
C213 is worth 0.02, the following will be instantly summed up to the present
frequency:
3000 * 0.02 / 60 * 2 = 2 Hz
for a motor with 2 pole pairs.
This amount, however, is limited to 5% of the present output frequency. As p
er the
example above, if fout = 30 Hz, the amount value would be limited to 30 * 0.05 = 1.5 Hz.
NOTE Parameter C213 has no effect if C210 = [With Resistance].
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