Showing posts with label INVERTER. Show all posts
Showing posts with label INVERTER. Show all posts

Tuesday 31 January 2017

INVERTER,S SPEED SEARCH DECELERATION TIME AND TIMER FUNCTION OFF DELAY TIME .



SPEED SEARCH DECELERATION TIME .
the output frequency deceleration time for speed search operation is set in unit of seconds.
note: set the time from the output frequency to the minimum frequency to be the deceleration time.
for the speed search deceleration time (b3 -03 ),set the output frequency deceleration time for while.the speed search is being performed. set the time required to deceleration from the maximum output frequency to 0 HZ .when the speed search and DC injection braking are set ,set the minimum base block time set the time to wait for the motor,s residual voltage to dissipate . if an over current  is detected when starting to prevent a fault from occurring.

TIMER FUNCTION OFF DELAY TIME.
timer function on delay time used to set the timer function output .on delay time (dead band ) for the timer function input , in unit for second .
note :effective when the timer function is set for multi function input,s . the timer functions are enabled when the timer function input (setting :18) and the timer function output ( setting :12)are set for the multi function input and multi function output respectively . these inputs and outputs server as general purpose 1/0 . chattering of sensor switches , and so on  , can be prevented by setting a delay time . when the timer input on time is longer than the value set for b4 - 01 (timer function on - delay time) the timer function output turns on.

Friday 27 January 2017

inverter,s Zero speed level (dc injection braking starting frequency )












Zero speed level (dc injection braking starting frequency ).

used to set the frequency which starts DC injection breaking (the initial excitation for flux vector control) in unit of Hz
note:
the DC braking function to supply  DC current to motor and decelerate  the motor.this happens in the following two cases.DC injection braking time at start Effective for temporarily stopping and then restarting,without regenerative processing, a motor coasting  by inertia DC injection  braking time at stop.used to prevent coasting by inertia  when the motor is not completely.for the zero level (b2_01),set the frequency for beginning DC for the injection braking for deceleration.if the excitation level is lower then the minimum output frequency(E1_09),the dc injection braking will begin from the minimum output frequency.in flux vector control mode,DC injection braking becomes  the initial excitation starting frequency at the time of deceleration.in that case,braking starts from the excitation level regardless of the minimum output frequency setting.the excitation level is also used as the operating frequency for zero servo function (for flux vector control only).for the DC injection barking current (b2_ 04),set the value for the current that is output at the time of DC injection barking DC injection braking current is set as a percentage of invertor rated output current,with the rated output current taken as 100%.for the DC injection braking operating time for when the motor is stopped.















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