Heater Burnout Alarm (Hba); 3-10-1 Hba Detection; 3-10-2 Operating Conditions - Omron E5CN User Manual

Heater Burnout Alarm (HBA)

3-10 Heater Burnout Alarm (HBA)

3-10-1 HBA detection

1,2,3...
To CT terminal
Heater lead

3-10-2 Operating conditions

When heater burnout is detected on a 3-phase heater, use the K2CU-F@@A-@GS
(with gate input terminal). For details, see the respective data sheet.)
• Heater burnout detection works as follows.
1. Connect the current transformer (CT) to terminal Nos. 14 and 15, and in-
sert the heater lead through the CT hole. For specifications, models and
external dimensions of current transformers that can be used on this con-
troller, see "Appendix, About Current Transformer (CT)."
2. When current flows through this lead, the current transformer generates
AC current proportional to the current value. The E5CN measures this AC
current to calculate the current flowing to the heater.
3. If the heater is burned out, the current measured at the current transformer
decreases. This value is compared with the value set as the "heater burn-
out set value", and the output becomes active as the heater burnout alarm.
• Set the heater burnout set value in the "heater burnout detection" param-
eter (adjustment level). To monitor the current value of the current trans-
former, use the "heater current monitor" parameter.
• When you are not using the HBA function, set the "heater burnout"
parameter (advanced function setting level) to "OFF".
• The HBA function can be used when the option unit (E53-CNH03 or E53-
CNHB) is mounted on the E5CN. Be sure to connect the CT to the E5CN,
and pass the heater lead through the CT hole.
• Turn the heater ON at the same time as or before turning the E5CN ON. If
the heater is turned ON after turning the E5CN ON, the heater burnout
alarm will activate.
• Control is continued even if the heater burnout alarm is active. (That is,
the E5CN attempts to control the heater on which the heater burnout
alarm has not occurred.)
• The heater burnout alarm is detected when the control output is continu-
ously ON for 190 ms or more.
• The rated current value may sometimes differ slightly from the actual cur-
rent flowing to the heater. Check the current value in an actual operating
state in the "heater current monitor" parameter.
• If there is little difference between the current in a normal state and the
current in the burnout state, detection may become unstable. On a heater
of current 10.0 A or less, maintain a difference of 1.0 A or more. On a
heater of current 10.0 A or more, maintain a difference of 2.5 A or more.
• The HBA function cannot be used when the heater is controlled by a
phase control system or cycle control system. Also, 3-phase heaters can-
not be used.
Section 3-10
35