CHAPTER 7 TROUBLESHOOTING
E5CK
7--6
7.4 Checking Operation Restrictions
With the E5CK controller, auto-tuning or self-tuning sometimes do not
operate depending on the way functions are combined. The table below
summarizes the main operating restrictions.
If the E5CK controller is not operating properly, first check whether oper-
ating conditions violate the restrictions in this table.
Restriction
Inoperable or Invalid Functions
Restriction
ST Execution
AT Execution
Limiter Function
Other
At analog input
¢
At heating and
cooling control
¢
40%AT
At ON/OFF
control
¢
¢
Manipulated variable
MV change rate
ST = ON
--
¢
Manipulated variable
MV change rate
SP ramp function
At AT execution
--
--
MV change rate
Parameter setting
At stop
¢
¢
Manipulated variable
MV change rate
Items marked by a “x” indicates combinations of conditions not acceptable during ST or AT execution.
Items marked by “---” are impossible combinations.