Maximum economy changeover (MECH), (cont’d)
For that purpose, MECH input 1 (MECH 1) must be assigned a digital input. Special application
example 1:
Changeover from
externally via digital
signal with air damper as
first cooling sequence
Function with TYPE = DMP and control via the cooling sequence:
Normal position => no inversion of air damper output (HREC)
Operated position => inversion of air damper output (HREC)
DI
DIG
Y2
Y6
Y1
M
M
M
SETCOOL
CTLOOP 1
y1 y2
HREC
HREC
68 / 174
Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Aggregates 29.08.2008
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