VLT ® 2900 Series 0 - 25.0 Hz Wobble mode OFF (OFF) [0] 0.0Hz Wobble mode ON (ON) [1] The jump frequency is used to compensate for the in- ertia in the traverse system. If a jump in the output frequency is required in the top and in the bottom of the wobble sequence, the fre- quency jump is set in this parameter. If the traverse system has a very high inertia a high jump frequency may create a torque limit warning or trip (warning/alarm 12) or an over voltage warning or trip (warning/alarm 7). The standard speed open loop mode set in parameter 100 is extended with a wobble function. In this param- eter it is possible to select or deselect the wobble function.
Deselecting the wobble function makes the drive operate in the standard speed open loop mode. Select OFF [0] to disable the wobble function. The speed open loop mode acts as in the standard VLT 2800 software. Select ON [1] to enable the wobble function. The frequency is specified in Hertz and can be set to a max. of 2x delta frequency. if set higher, the system will automatically limit the setting to 2x delta frequency. NB! The “Center Frequency” setting is no lon- ger in Par. 701 and therefore also no lon- ger limited to 120 Hz. The setting of “Center Frequency” now takes place via the normal reference handling parame- ters 200 to 205 (see manual MG. 28.EX.YY).
1 - 50 ms Programming 1 ms This parameter determines the slope of the jump ramp at the maximum and minimum wobble frequency. The time is specified in milliseconds. 0 - 20.0 Hz 5.0Hz The delta frequency is determining the magnitude of the wobble frequency. The delta frequency is super- imposed on the center frequency. Parameter 702 is selecting both the positive and negative delta frequen- cy. Parameter 702 can be set higher than the setting of the center frequency, but in this case the system will automatically limit the par. 702 setting to the level of the center frequency. The initial ramp up time from standstill until the wobble sequence is running is determined by parameter 207.
1.0 - 1000.0 s This parameter determines the wobble sequence pe- riod. Wobble time = t up + t down 10.0 s The time is entered in seconds. The frequency is specified in Hertz. 0.1 - 10 1 = factory setting, () = display text, [] = value for use in communication via serial communication port MG.29.A3.02 - VLT ® is a registered Danfoss trademark 55 703 Jump frequency (JUMP FREQ) Value: 700 Wobble mode (WOBB MODE) Value: Function: Function: Description of choice: Description of choice: 704 Jump time (JUMP TIME) Value: Function: 702 Delta frequency (DELTA FREQ) Value: Description of choice: 705 Wobble time (WOBB TIME) Value: Function: Function: Description of choice: Description of choice:
706 Wobble ratio (WOBB RATIO) Value: