Manual Setting Of The Pid Control Parameters - Siemens LMV50 Series Manual

Standard values of
control parameters
110/327
Building Technologies
7.4.2.1

Manual setting of the PID control parameters

It is possible to manually set the PID parameters to any value in the setting range
shown below, to activate a triple value from the predefined standard values described
below (and edit it further if required), or to use the adaption function (self-setting
function) instead of making the settings manually. The LMV5 then acquires the PID
parameters itself.
Parameter:
Proportional band P-part (Xp) (2...500%)
from 100 °C / 1 bar or 212 °F / 14.5 psi
Reaction:
Xp = 2% ↑ strong / fast
Xp = 500% ↑ weak / slow
Integral action time I-part (Tn) (0...2,000 s) 0 = no I-part
Reaction:
Tn = 1 ↑ strong / fast
Tn = 2.000 ↑ weak / slow
Derivative action D-part (Tv) (0...1,000 s) 0 = no D-part
time
Reaction:
Tv = 1 ↑ weak / slow
Tv = 1,000 ↑ strong / fast
The controller's memory contains 5 standard parameter sets.
If required, 1 of these 5 PID triple values can be copied to the storage locations for the
actual values so that it becomes active.
PID standard values for the following applications:
Parameter Standardparam (Adaption / very fast / fast / normal / slow / very
slow)
Adaption
very fast
(e.g. for small boiler)
fast
normal
slow
very slow
(e.g. for large boiler)
Basic Documentation LMV5...
7 Boiler controller / load controller
The values acquired by the LMV5 adaption function are used
Xp
in %
42.5
14.5
6.4
4.7
3.4
Tn Tv
in s in s
68 12
77 14
136 24
250 44
273 48
CC1P7550en
22.05.2018