VLT ® 2900 Series transistors are "turned off"), which means that the mo- tor runs freely to stop. Logic '0' leads to coasting to stop. Reversing and start is used for start/stop and for re- versing with the same signal. No active start command is allowed at the same time. Acts as latch start revers- ing, provided latch start has been chosen for terminal 18. Is not active for Process regulation, closed loop . See also parameter 200 Output frequency range/di- rection . Reset and coasting inverse are used to activate motor coast simultaneously with reset. Logical '0' means mo- tor coast stop and reset. Reset is activated on the falling edge.
Start clockwise is used if you want the motor shaft only to be able to rotate clockwise when started. Should not be used for Process regulation, closed loop . Quick stop inverse is used for activating the quick-stop ramp down set in parameter 212 Quick stop ramp- down time. Logic '0' leads to quick stop. DC-braking inverse is used for stopping the motor by energizing it with a DC voltage for a given time, see parameters 126, 127 and 132 DC brake . Please note that this function is only active if the value in parameter 126 DC braking time and 132 DC brake voltage is dif- ferent from 0. Logic '0' leads to DC braking.
Start anticlockwise is used if you want the motor shaft only to be able to rotate anticlockwise when started. Should not be used for Process regulation, closed loop . See also parameter 200 Output frequency range/ direction . Jog is used to override the output frequency to the jog frequency set in parameter 213 Jog frequency . Jog is active regardless of whether a start command has been given, yet not when Coast stop , Quick-stop or DC braking are active. Stop inverse , a logic '0' means that the motor speed is ramped down to stop via the selected ramp. None of the stop commands mentioned above are to be used as repair switches.
Note that the frequency converter has more voltage inputs than L1, L2 and L3 when the DC bus terminals are used. Check that all voltage inputs are discon- nected and that the prescribed time (4 mins.) has passed before repair work is commenced. Freeze reference freezes the present reference. The reference can now only be changed via Speed up and Speed down . If freeze reference is active, it will be saved after a stop command and in the event of mains failure. Programming Freeze output freezes the present output frequency (in Hz). The output frequency can now only be changed via Speed up and Speed down . Start is selected if a start/stop command is required.
Logic '1' = start, logic '0' = stop. NB! If Freeze output is active the frequency converter can only be stopped if you se- lect Motor coast , Quick stop or DC brak- ing via a digital input. Speed up and Speed down are selected if digital con- trol of the up/down speed is required. This function is only active if Freeze reference or Freeze output frequen- cy has been selected. If Speed up is active the reference or output frequency will be increased, and if Speed down is active the ref- erence or output frequency will be reduced. The output frequency is changed via the preset ramp times in pa- rameters 209-210 Ramp 2 .
One pulse (logic '1' minimum high for 14 ms and a minimum break time of 14 ms) will lead to a speed change of 0.1 % (reference) or 0.1 Hz (output frequen- cy). Example: Latched start , if a pulse is applied for min. 14 ms, the frequency converter will start the motor, provided no stop command has been given. The motor can be stopped by briefly activating Stop inverse . Reversing is used for changing the direction of rotation of the motor shaft. Logic '0' will not lead to reversing. Logic '1' will lead to reversing. The reverse signal only changes the direction of rotation, it does not activate the start. Is not active at Process regulation, closed loop .
See also parameter 200 Output frequency range/di- rection . = factory setting, () = display text, [] = value for use in communication via serial communication port MG.29.A3.02 - VLT ® is a registered Danfoss trademark 37