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Setpoint channel and closed-loop control
7.3 V/f (V/Hz) control
Parameters
• r0056.5
• r0056.6
• p0304
• p0305
• r0395
• p1310
• p1311
• p1312
• r1315
7.3.2
Resonance damping
Description
The resonance damping function dampens active current oscillations that frequently occur
under no-load conditions.
The resonance damping is active in a range from approximately 6 % of the rated motor
frequency (p0310). The switch-off frequency is determined by p1349.
For p1300 = 5 and 6 (textiles) the resonance damping is internally disabled in order to be
able to precisely set the output frequency.
Figure 7-9
440
Voltage boost at start up active/inactive
Acceleration voltage active/inactive
Rated motor voltage
Rated motor current
Current stator resistance
Startup current (voltage boost), continual
Startup current (voltage boost) on acceleration
Startup current (voltage boost) at startup
Voltage boost total
Resonance damping
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
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