6. Parameter setting and functions
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6.3.7 Heater disconnection alarm [
HB-A
]
When load resistance display method is set as [
UP
], it is over the set value, this alarm occurs.
[
H-BK
] and display value ashes for 2 sec. in turn in the display part and EVT indicator ashes for
0.5 sec.
Even though heater disconnect alarm occurs, control operation continues.
It is cleared automatically when the value is below the SV of heater disconnect alarm value.
(1) Heater disconnection alarm value setting [
HB-V
]
Regardless of control method (phase control, cycle control), it operates. For the operation, over
10% of control output (phase control, cycle control) and over 30% of rated current are required.
• Set range: 10 to 500 (unit: %)
Hysteresis of heater disconnect alarm is xed as 1% for ON/OFF interval.
When SV for heater disconnect alarm is 50%, alarm turns ON at 50%, alarm turns OFF at 49%.
ON
OFF
49%
50%
SV
(2) Heater disconnection alarm delay time [
HB-T
]
When load resistance display method is set as [
DOWN
] and load resistance value is under the SV
of [
HB-V
], alarm disconnection alarm occurs after the set delay time.
• Set range: 0, 1, 2, 3, 5, 10, 20, 30 (unit: sec.)
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