3 switching attitude non-linear ( cycl= 2 ) 51, Standard 51 – West Control Solutions N8800 User Manual
Page 51

4.4.4 Heating and cooling with constant period ( CyCl= 3 )
1 and t2 are met in the overall
output range . To prevent
unreasonably short pulses, parameter
tp is used for adjusting the shortest
pulse duration. With small correcting
values which require a pulse shorter
than the value adjusted in tp, this
pulse is suppressed. However, the
controller stores the pulse and
totalizes further pulses, until a pulse
of duration tp can be output.
Parameters to be adjusted:
t1 : Min. cycle time 1 (heating) [s]
( PArA/ Cntr)
t2 : min. cycle time 2 (cooling) [s]
tp: min. pulse length [s]
Configuration level
8800 process controller
51
Switching behaviuor
50%
50%
t1 t2
/
tp
tp
30%
70%
20%
80%
10%
90%
t1 t2
/
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