Operating instructions

Functions, monitoring, and protective functions
9.3 Drive functions
Drive converter cabinet units
340 Operating Instructions, 10/2008, A5E00288214A
Characteristics:
● The reaction to overload depends on the setting of parameter p0290:
– p0290 = 0: Reduce output current or output frequency
– p0290 = 1: No reduction, shutdown when overload threshold is reached
– p0290 = 2: Reduce the output current or output and pulse frequency (not using I²t).
– p0290 = 3: Reduce the pulse frequency (not using I²t)
● For p0290 = 2 at overload first reduce the pulse frequency (and consequently the output
frequency) until it has dropped to rated pulse frequency, then reduce the output
frequency if overload continues to persist.
The rated pulse frequency is half the inverse value of the current controller clock cycle:
0.5 x 1/p0115[0].
● Reduction of the pulse frequency is executed in whole multiples based on the rated pulse
frequency (5 kHz -> 2.5 kHz -> 1.25 kHz or 4 kHz -> 2 kHz).
● After entering the maximum speed in p1082 the system automatically calculates whether
the pulse frequency is sufficient for the entered maximum speed, if necessary the pulse
frequency is increased automatically to a value that is necessary for this.
At overload, then also for p0290 = 2 or 3, this new pulse frequency will no longer be
underranged, the downstream reaction (reduce output voltage or switch off) will be
triggered.
Exceptions:
● With an activated sinus filter (p0230 = 3, 4), this behavior is not permitted because the
factory set pulse frequency (2.5 kHz or 4 kHz) should not be changed through this
measure. Consequently in this case the selection possibility for the parameter p0290 is
limited to "0" and "1".
Activation of the variable pulse frequency
At commissioning the parameter p 0290 is automatically set to the value "2". This activates
pulse frequency reduction at overload.
Deactivation of the variable pulse frequency
By changing the parameter p0290 to "0" or "1" the variable pulse frequency is deactivated.
Function diagram
FP 8014 Signals and monitoring functions - thermal monitoring power unit