Honeywell DCP551 Mark ΙΙ User Manual page 85

Chapter 5. FUNCTIONS
NOTE
5-36
• When switching between automatic changeover A to C, make sure that the
changeover point is set in the overlapping area between the high-temperature and low-
temperature sensors and 1/2 inside the deadband.
Possible setting range of Change point
Low tempe-
rature sensor
• When there is a temperature difference between the two inputs from high-temperature
and low-temperature sensors, PV reflects this but the control output performs a PID
computation to prevent a major disturbance from occurring. When a major distur-
bance occurs in the control output, select automatic changeover C.
• Select setup data setting
during automatic changeover A and B. When set to 0, the power stays off; when set to
1, a switch is made to CH1; and when set to 2 a switch is made to CH2.
Value equivalent
to 1/2 of dead band
Overlap range
C29
when an initial changeover setting is desired at power on
High tempe-
rature sensor