Omron G3PW, User Manual

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Heater Burnout Detection Section 5-9
• Heater Characteristic Resistance (HPR or HCR) (in adjustment level)
Setting the Operation for When a Heater Burnout Alarm Occurs
To use the heater burnout detection function, set the Heater Burnout Alarm
Operation parameter [P14] to a value other than 0 in the initial setting level.
Heater Characteristic
Resistance
The heater characteristic resistance is the value equivalent to the combined
resistance of the connected heater loads.
Note The power supply voltage is assumed to be 100 V. When the power
supply voltage is 200 V, the heater characteristic resistance will be
one half of the actual combined resistance.
Heater characteristic resistance
≅
Combined resistance
×
(100/Power supply voltage)
The heater characteristic resistance can also be set directly, but it is recom-
mended that it first be set using the teaching function.
Accurate heater characteristic resistance can be easily set by using the Teach
Heater Characteristics for Phase Control (TPC) or Teach Heater Characteris-
tics for Optimum Cycle Control (TCC) parameters in the adjustment level.
Teaching Operations in
the Adjustment Level When teaching is executed, the present resistance is automatically used as
the heater characteristic resistance.
Teaching cannot be executed when the current flowing to the CT is less than
10% of the rated current. Perform teaching only when the current is at least
10% of the rated current and when control is stable.
To set the parameter directly without teaching or to make an adjustment after
teaching, select the Heater Characteristic Resistance parameter (HPR or
HCR).
P14 setting Meaning Description
0 No operation Heater burnout detection does not operate.
1 Alarm level 1 Heater burnout detection functions at alarm level 1.
2 Alarm level 2 Heater burnout detection functions at alarm level 2.
t pc
EN T
1 07
EN T
t pc t er
00
EN T
When teaching is not possible,
0.0 will be displayed.
A teaching error occurred.
Remove the cause of the
error and then try again.
Select TPC for phase
control or TCC for
optimum cycle control.
The present heater
characteristic resistance
will be displayed.
After the setting has
been made, the menu
will again be displayed.
Display Name Operation
TPC Teach Heater Characteristics for
Phase Control Sets the present resistance as the
heater characteristic resistance for
phase control.
TCC Teach Heater Characteristics for
Optimum Cycle Control Sets the present resistance as the
heater characteristic resistance for
optimum cycle control.