5-36
NOTE
• 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.
• 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 disturbance occurs in the control output, select
automatic changeover C.
• Select setup data setting
C29
when an initial changeover setting is desired
at power on 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
Low temper-
ature sensor
Overlap range
High temper-
ature sensor
Possible setting range of Change point
Chapter 5. FUNCTIONS
