Omron E5CN User Manual

61
Using Heater Burnout, Heater Short, and Heater Overcurrent Alarms Section 3-10
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.
• For Controllers with heater burnout, HS, and heater overcurrent alarms,
an OR output is established between the ALM 1 function and the alarms.
If the ALM1 function is to be used for the heater burnout, HS, and heater
overcurrent alarms only, set 0 as the alarm 1 type (i.e., do not use ALM1).
• Turn the heater power ON simultaneously or before turning ON the E5@N
power. If the heater power is turned ON after turning ON the E5AN power,
the HB alarm will be activated.
• Control is continued even when the heater burnout, HS, or heater over-
current alarm is active.
• The rated current value may sometimes differ slightly from the actual cur-
rent flowing to the heater.
Use the Heater Current 1 Value Monitor, Heater Current 2 Value Monitor,
Leakage Current 1 Monitor, and Leakage Current 2 Monitor parameters to
check the actual current being used.
ON Lit Normal --- --- OFF
Heater overcurrent status
(See note 3.)
--- --- ON
Control output (heating) status Power to heater HB alarm
output
HS alarm
output
Heater overcurrent
alarm output
Control output
(heating)
Operation
indicator
Ton
(See note 3.)
ON
OFF
Toff
(See note 4.)
Control output (heating)

Omron E5CN Specifications

General

Brand	Omron
Model	E5CN
Category	Temperature Controller
Language	English