Omron E5EK, User Manual

Page: 44 / 203

CHAPTER 3 BASIC OPERATION
E5EK
3--8
•
Factory settings are as follows:
control output 1 = Control output (heat)
control output 2 = Alarm 1
auxiliary output 1 = Alarm 2
auxiliary output 2 = Alarm 3
•
Output assignments are set in the “control output 1 assignment”,
“control output 2 assignment”, “ auxiliary output 1 assignment” and
“ auxiliary output 2 assignment” parameters (setup mode).
•
Position-proportional type controllers support nine output functions.
These are assigned to auxiliary outputs 1 and 2.
•
Restrictions on assignment destinations are placed on some of the
outputs. The following table shows where outputs may be assigned to.
Assignment
Destination
Control Output Auxiliary Output
Destination
Output Function
1 2 1 2
Alarm 1
F F
Alarm 2
F F
Alarm 3
F F
Time signal 1
F F
Time signal 2
F F
Stage output
F F
Program end output
F F
Error 1 : Input error
F F
Error 2 : A/D converter error
F F
•
“Direct operation” (or normal operation) refers to control where the ma-
nipulated variable is increased according to the increase in the process
value. Alternatively, “reverse operation” refers to control where the ma-
nipulated variable is decreased according to the decrease in the process
value.
For example, when the process value (PV) (temperature), is lower
than the set point (SP) (temperature), in a heating control system, the
manipulated variable increases by the difference between the PV and
SP values.
Accordingly, this becomes “reverse operation” in a heating control
system, or alternatively, “direct operation” in a cooling control sys-
tem.
•
Direct/reverse operation is set in the “direct/reverse operation” pa-
rameter (setup mode). Default is “
: reverse operation”.
•
On position-proportional type controllers, this item cannot be set.
•
On a standard type controller, when the output unit is for pulse out-
put such as relay output, set the pulse output cycle (control period).
Though a shorter control period provides better control performance,
the control period should be set to 20 seconds minimum taking the
life expectancy of the output unit into consideration when the output
unit is for relay output.
•
The control period is set in the “control period (heat)” parameter
(level 1 mode). Default of the “control period” parameter is “20:20
seconds.” Default of the “control period (cool)” output function is not
assigned. So, the “control period (cool)” parameter cannot be set.
F
Position-propor-
tional type
J
Direct/reverse
operation
J
Control period