Omron E5AK User Manual page 40

F Position-propor-
tional type
J Direct/reverse
operation
J Control period
· 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", "con-
trol output 2 assignment", "aux output 1 assignment" and "aux output
2 assignment" parameters (setup mode).
· Position-proportional type controllers support six output functions.
These are assigned to auxiliary outputs 1 and 2.
· Restrictions on assignment destinations are placed on some of the out-
puts. The following table shows where outputs may be assigned to.
Assignment
Destination Destination
Output Function
Alarm 1
Alarm 2
Alarm 3
Error 1 : Input error
Error 2 : A/D converter error
Error 3 : RSP input error
· "Direct operation" (or normal operation) refers to control where the
manipulated variable is increased according to the increase in the pro-
cess value. Alternatively, "reverse operation" refers to control where the
manipulated variable is decreased according to the decrease in the pro-
cess value.
For example, when the process value (PV), is lower than the set point
(SP), 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.
Alternatively, this becomes "direct operation" in a cooling control system.
· Direct/reverse operation is set in the [
parameter (setup mode).
· When the output unit is pulse output such as relay output, set the pulse
output cycle (control period). Though a shorter pulse period provides
better control performance, the control period should be set taking the
life expectancy of the output unit into consideration when the output
unit is relay.
· The control period is set in the "control period (heat)" parameter (level
1 mode). Factory setting is "20:20 seconds."
· The "control period (cool)" output function is not allocated. So, the
"control period (cool)" parameter cannot be set.
3.3 Setting Output Specifications
Control Output Auxiliary Output
1 2 1
F
F
F
F
F
F
]"direct/reverse operation"
2
F
F
F
F
F
F
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