6 Parameters6.5 Parameter descriptionDE1 variable speed starter 09/14 MN040011EN www.eaton.com 87The following formulas can be used to calculate acceleration time t 1 anddeceleration time t2 (relative to the motor's rated frequency (P-09)) for amaximum output frequency P-01:If there is a given acceleration time t 1 and a given deceleration time t 2, theset values for P-03 (t-axx) and P-04 (t-dec) can be calculated as follows for ahigher output frequency (P-01):If the value set for f-min (P-02) is different from 0 Hz, the drive will acceleratewith the acceleration time configured in P-03 to a value of f-min in time tf-minafter receiving an enable signal (FWD, REV).ExampleP-02 = 20 Hz (= f-min), P-03 = 5 s, P-09 = 50 HzThe overvoltage control function (default setting: P-31 = 0) will monitor theDC link voltage's magnitude and prevent the DE1 variable speed starter frombeing switched off if the motor's energy recovery results in the DC linkvoltage exceeding its limits. The output frequency will be automaticallyadjusted as required (V/f).The fault message in the event of an excessive DC link voltage whenP-31 = 1 will be:Fault Code LED: 3 pulses – overvoltage.t 1 = P-01 x P-03 , t 2 = P-01 x P-04P-09 P-09P-03 = t 1 x P-09 , P-04 = t 2 x P-09P-01 P-01￫ The defined acceleration (P-03) and deceleration times (P-04)apply for all changes to the frequency reference value (f-REF).t f-min = P-02 x P-03 = 20 Hz x 5 s = 2sP-09 50 Hz￫ During continuous operation, excessive DC link voltage mayresult in the motor's speed being temporarily increased.If deceleration ramp P-04 is active, this frequency increase willresult in a ramp prolongation.
