Omron E5AN-H User Manual

71
Using Heater Burnout, Heater Short, and Heater Overcurrent Alarms Section 3-10
3-10 Using Heater Burnout, Heater Short, and Heater
Overcurrent Alarms
3-10-1 Heater Burnout, Heater Short, and Heater Overcurrent Alarm
Operations
• Heater burnout detection and heater overcurrent detection are executed
by measuring heater current while the control output (heating) is ON, and
heater short detection is executed by measuring heater current while it is
OFF. For details, refer to the following table. (Heater burnout detection,
heater short detection, and heater overcurrent detection cannot be used
with the control output for cooling.)
• These settings can be made for standard models only.
Note (1) In the above diagram, power is considered to be ON (normal) if the heater
current is greater than the heater burnout detection current during the Ton
interval. If the heater is burned out, the measured current decreases and
falls below the heater burnout detection value. The output is then activat-
ed as the heater burnout alarm.
(2) In the above diagram, power is considered to be OFF (normal) if the leak-
age current is less than the HS alarm current during the Toff interval. If
the SSR output is short-circuited, the measured current increases be-
yond the HS alarm value. The output is then activated as the HS alarm.
(3) In the above diagram, it is regarded as normal when the heater current is
less than the heater overcurrent detection current during the Ton period.
Current is increased when excessive current flows to the heater, causing
the heater overcurrent detection value to be exceeded and an OC (heater
overcurrent) alarm to be output.
(4) Heater burnout and heater overcurrent are not detected if the control out-
put (heating) ON time (Ton) is 100 ms or less.
(5) HS alarms are not detected if the control output (heating) OFF time (Toff)
is 100 ms or less.
Control output (heating) status Power to heater HB alarm
output
HS alarm
output
Heater overcurrent
alarm output
Control output
(heating)
Operation
indicator
ON Lit Yes (Normal) (See note 1.) OFF --- ---
No (Heater burnout) ON --- ---
OFF Not lit Yes (HS alarm) --- ON ---
No (Normal) (See note 2.) --- OFF ---
ON Lit Normal --- --- OFF
Heater overcurrent status
(See note 3.)
--- --- ON
Ton
(See note 3.)
ON
OFF
Tof f
(See note 4.)
Control output (heating)

Omron E5AN-H Specifications

General

Brand	Omron
Model	E5AN-H
Category	Temperature Controller
Language	English