VLT ® 2900 Series Select DC hold during start delay time [0] to energize the motor with a DC hold voltage during the start delay time. Set voltage in parameter 137 DC hold voltage . 0.0 - 0.5 sec. 0.0 sec. To ensure a high start torque approx. 1.8 x I INV. can be permitted for max. 0.5 sec. The current is, however, limited by the frequency converter's (inverter's) safety limit. 0 sec. corresponds to no high start torque. Choose DC brake during start delay time [1] to energize the motor with a DC brake voltage during the start de- lay time. Set voltage in parameter 132 DC brake volt- age .
Choose Coasting during start delay time [2] and the motor will not be controlled by the frequency converter during the start delay time (inverter turned off). Set the necessary time for which a high start torque is required. Choose Start frequency/voltage clockwise [3] to obtain the function described in parameter 130 Start frequen- cy and 131 Voltage at start during start delay time. Regardless of the value assumed by the reference signal, the output frequency equals the setting in pa- rameter 130 Start frequency and the output voltage will correspond to the setting in parameter 131 Voltage at start . This functionality is typically used in hoist applications.
It is used in particular in applications in which a cone anchor motor is applied, where the direction of rotation is to start clockwise followed by the reference direc- tion. 0.0 - 10.0 sec. 0.0 sec. This parameter enables a delay of the start-up time after the conditions for start have been fulfilled. When the time has passed, the output frequency will start by ramping up to the reference. Programming Select Start frequency/voltage in reference direction [4] to obtain the function described in parameter 130 Start frequency and 131 Voltage at start during the start de- lay time. The direction of rotation of the motor will always follow in the reference direction.
If the reference signal equals zero, the output frequency will equal 0 Hz, while the output voltage will correspond to the setting in pa- rameter 131 Voltage at start . If the reference signal is different from zero, the output frequency will equal pa- rameter 130 Start frequency and the output voltage will equal parameter 131 Voltage at start . This functionality is used typically for hoist applications with counter- weight. It is used in particular for applications in which a cone anchor motor is applied. The cone anchor mo- tor can break away using parameter 130 Start frequen- cy and parameter 131 Voltage at start . Set the necessary time before commencing to accel- erate.
DC hold during start delay time (DC HOLD/DELAY TIME) [0] DC brake during start delay time (DC BRAKE/DELAY TIME) [1] Coasting during start delay time (COAST/DELAY TIME) [2] Start frequency/voltage clockwise (CLOCKWISE OPERATION) [3] Start frequency/voltage in reference direction (VERTICAL OPERATION) [4] This is where to choose the required mode during the start delay time (parameter 120 Start delay time ). = factory setting, () = display text, [] = value for use in communication via serial communication port MG.29.A3.02 - VLT ® is a registered Danfoss trademark 23 119 High start torque (High start torq.) Value: Description of choice: Function: Description of choice:
120 Start delay (START DELAY) Value: Function: Description of choice: 121 Start function (START FUNCTION) Value: Function: