Siemens Synco 200 - Page 69

Maximum economy changeover (MECH), (cont’d)
Special application
example 2:
Changeover at
adjustable difference with
air damper as first
cooling sequence
To achieve changeover at an adjustable difference between 2 measured values,
you must assign one analog input each to MECH input 1 (MECH 1) and MECH
input 2 (MECH 2). To do this, assign the outside temperature to MECH input 1, and
the room temperature to MECH input 2.
Function with TYPE = DMP and control via the cooling sequence:
When the set MECHU limit value (MECHSET) is exceeded, the air damper
output (HREC) will be inverted.
X2
OUTS
X1
ROOM
SETCOOL
Y2
Y6
Y1
M
M
M
CTLOOP 1
y1 y2
HREC
HREC
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Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Aggregates 29.08.2008