Omron E5CN-FR, Manual

Page: 12 / 20

12
Limit Controller
E5CN-FR
Limit Controller Functions
When the measured temperature (PV) exceeds the limit SP, the limit output relay turns OFF and the OUT1 operation indicator turns ON. If the
limit output relay turns OFF (limit alarm is ON), the limit output relay will remain off until the operator manually resets the Limit Controller.
■
Selecting Upper/Lower Limit
• The upper/lower limit selection setting enables switching between upper limit and lower limit operation.
• The default setting is for upper limit operation.
Select either upper limit or lower limit.
■
Resetting Limit Outputs
• Limit outputs can be reset by pressing the Level Key/Reset Key for 1 second min. while in the operation level.
• The limit output reset operation can be used to reset limit outputs and annunciator outputs.
∗
When the limit status is OFF, the limit output is cleared and the limit output relay turns ON. When the limit status is ON (limit over status), limit
outputs will not be reset.
∗
The annunciator output turns OFF regardless of the limit status.
∗
Event inputs used as reset inputs (for resetting limit outputs) can be received while in the operation level, adjustment level, or protect level.
Power ON
Limit SP
Malfunction
Control SP
Temperature in furnace
Before turning
ON power
Limit output relay ON
Limit output relay OFF
Hysteresis
Annunciator output
Limit output relay
Limit status
Limit SP
Hysteresis
ON
OFF
ON
OFF
ON
OFF
(1) RESET
(Reception
not possible) (3) RESET
(Reception
not possible) (2) RESET
(Reception
possible)