Lenze E94A - Manual (Page 503)

Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
503
5 Function blocks
5.132 L_SdProcessController - PID controller with limitation
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5.132.5 Ramp function generator
The dnSetValue_n input setpoint can be lead via a ramp function generator with linear ramps to pre-
vent setpoint step-changes at the input.
The following applies up to and including library V02.08.xx.xx:
• The acceleration/deceleration times are set via C04375.
The following applies from library V02.09.xx.xx:
• The acceleration and deceleration times are set in C04375 and C04386.
• If C04386 = "1000.001 s" (Lenze setting), the setting in C04375 is used for both the accelera-
tion and the deceleration time, which corresponds to the behaviour so far (symmetrical acce-
leration/deceleration times).
• If C04386 <> "1000.001 s", the setting in C04375 is used as the acceleration time and a sepa-
rate setting in C04386 is used as the deceleration time.
• The acceleration time describes the time necessary to reach 100 %.
• The setting is done according to the formula:
• In the Lenze setting, the ramp function generator is deactivated (C04375 = 0.000 s).
• By setting the bLoadActValue input to TRUE, the ramp function generator can be initialised with
the value applied to the dnActValue_n input. This causes the system deviation to be zero.
5.132.6 Low pass in actual value path
The dnActValue_n actual value loaded by setting bLoadActValue to TRUE can be lead via a PT1 filter.
• The rate time is set in C04383.
• In the Lenze setting, the filter is deactivated (C04383 = 0.001 s).
[5-104] PT1 filter function
1 s 100 % ⋅
C04375 [s]
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T
In = Out
t