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4.5 How to Use the Heater Burnout Alarm
E5AK
4--13
4.5 How to Use the Heater Burnout Alarm
·
On a standard type controller, the HBA (heater burnout alarm) function
can be used only when the assignment destination of the output function
“control output (heat)” is set to pulsed output.
·
When using the HBA function, assign output function “heater burnout
(HB) alarm” to auxiliary outputs 1 or 2.
·
Heater burnout detection works as follows.
(1) Connect the current transformer (CT) to terminal Nos.15 and 17, and
insert the heater lead through the CT hole.
(2) When current flows through this lead, the current transformer gener-
ates AC current proportional to the current value. The E5AK mea-
sures this AC current to calculate the current flowing to the heater.
(3) If heater is burned out, the current measured at the current trans-
former decreases. This value is compared with the value set as the
heater burnout set value and is output as the heater burnout alarm.
·
Set the heater burnout set value in the “heater burnout alarm” parame-
ter. To check the current value of the current transformer, use the
“heater current monitor” parameter.
·
When you are not using the HBA function, set the “heater burnout
alarm” parameter to “0.0 (disabled)”.
·
When the HBA latch function is set to “ON”, the heater burnout alarm
is held until either of the following measures is taken:
a Set the heater burnout set value to “0.0”.
b Reset the controller.
(Turn the controller’s power OFF then back ON again.)
·
To enable the HBA latch function, set the “HBA latch” parameter to
“ON”.
·
Turn the heater power supply ON at the same time as or before turning
the E5AK power supply ON. If the heater power supply is turned ON
after turning the E5AK power supply On, the heater burnout alarm is
output.
·
Control is continued even when the heater burnout alarm is output.
(That is, the controller attempts to control the heater as if the heater
burnout alarm has not occurred.) So, remedy the condition such as
repairs which are caused by the heater burnout alarm.
·
The heater burnout alarm is detected only if the control output is contin-
uously ON for 190 ms or more.
·
The rated current value may sometimes differ slightly from the actual
current value flowing to the heater. Check the current value in an actual
operating status in the “heater current monitor” parameter.
·
If there is little difference between the current in a normal status and the
current in a burnout status, 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.
·
Heater burnout alarm function cannot be used when controlling the
heater by a phase control method or by a cycle control method. Also,
3-phase heaters cannot be used.
When detecting heater burnout on a 3-phase heater, use the K2CU-F
VV
A-
V
GS
(with gate input terminal). (For details, see the respective data sheet.)
J
Heater burnout
detection
To E5AK
CT terminal
Heater wire
CT
F
HBA
latch/release
J
Operating
conditions
Содержание E5AK
Страница 1: ...Cat No H083 E1 02A E5AK Digital Controller USER MANUAL ...
Страница 21: ...CHAPTER 1 INTRODUCTION 1 12 ...
Страница 33: ...CHAPTER 2 PREPARATIONS 2 12 ...
Страница 51: ...CHAPTER 3 BASIC OPERATION 3 18 ...
Страница 145: ...CHAPTER 7 CALIBRATION 7 14 ...