OMRON provides single-phase/three-phase
Power Controllers with a phase control system and Multi-channel Power
Controller that enable high-precision temperature control with optimum
cycle control.
Heater Control Types
G3PX Control Methods
Analog Control
The change in current output of the Temperature Controller between 4 and
20 mA is used for precise heater control by the G3PX,which outputs
smoothly adjusted power. Fine adjustments of the heater temperature are
possible with external or internal duty setting.
ON/OFF Control
The voltage output of the Temperature Controller is used for ON/OFF heater
control. Fine adjustments of the heater temperature are possible with
external or internal duty setting.
Two-position Control
The high level and low level of the output are freely set with an external
variable resistor, either of which is selectable with the relay output of
the Temperature Controller.
Manual Control
Output adjustments are possible with an external variable resistor.
ON/OFF Control
Cycle Control
Optimum Cycle Control (High-accuracy zero-cross control)
Phase Control (Single-phase Model)
Power Controller Glossary
Phase Control
Output is varied at half-phase intervals. Therefore, highly accurate
temperature control is possible.
The following is an example of a waveform in single-phase control.
Three-phase models use a three-arm phase control method.
This function suppresses heat shock and
ensures fine control without being influenced by external disturbance. As
a result, each heater can withstand long use.
Duty Setting
As shown in the following graphs, the change of output can be adjusted
with an internal or external variable resistor.
In the case of an electric oven, overshooting may result by using a heater
with a capacity that is excessively high for the size of the oven.
By adjusting the duty-setting variable resistor, the overshooting can be
suppressed.
For example, if a duty of 60% is set for a 5-kW heater, a maximum of 3 kW
will be input into the heater. Thus, it operates as a 3-kW heater.
Duty Setting All G3PX Single-phase Models
All G3PX Three-phase Models
Soft-start
This function suppresses the inrush current that is caused when the load
is turned ON, thus ensuring smooth starting of the load.
This function is especially effective for loads that involve high inrush
current, such as halogen lamps.
The following is an example of a waveform in single-phase control.
Base-up
This function briefly keeps the output of the G3PX turned ON after heating
when the input signal is OFF.
This is effective for a smooth start of equipment that is slow in initial
heating operation.
Constant Current
If the load has an extremely high inrush current, the extended soft-start
function cannot suppress the inrush current. The constant-current function
suppresses the inrush current automatically, thus protecting the heater
and system from damage.
Connection Examples of Single-phase G3PX and
Temperature Controller
-
The soft-start time is adjusted between
0.5 and 10 s, thus enabling the heaters to withstand long use.
-
If a single Temperature Controller is in
control of more than one heater, by making a proper duty setting, the
difference in temperature between the heaters can be improved.
(Connection Example 2)
Note: The temperature at point B can be
higher than that at point A due to thermal interference. In that case,
make the duty set value for heater B smaller than that for heater A so
that there will be no difference in temperature between points A and B.
Connection Example 1.
Duty Change Using Voltage-output Temperature Controller and One G3PX
Connection Example 2.
Duty Change Using Voltage-output Temperature Controller and Multiple G3PXs
Connection Example 3.
Temperature Control Using Temperature Controller with Current Output of 4
to 20 mA and G3PX
Connection Example 4.
Duty Change Using Temperature Controller with Current Output of 4 to 20 mA
and G3PX
Connection Examples of Three-phase G3PX and
Temperature Controller
The soft-start time is adjusted between 0.5 and 10 s, thus enabling the
heaters to withstand long use.
If a single Temperature Controller is in control of more than one heater,
by making a proper duty setting, the difference in temperature between the
heaters can be improved. (Connection Example 2)
Note: The temperature at point B can
be higher than that at point A due to thermal interference. In that case,
make the duty set value for heater B smaller than that for heater A so
that there will be no difference in temperature between points A and B.
Connection Example 1.
Duty Change Using Voltage-output Temperature Controller and One G3PX
Note: Turn the Internal DUTY Adjuster
fully to the right.
Connection Example 2.
Duty Change Using Voltage-output Temperature Controller and Multiple G3PXs
Connection Example 3.
Temperature Control Using Temperature Controller with Current Output of 4
to 20 mA and G3PX
Connection Example 4.
Duty Change Using Temperature Controller with Current Output of 4 to 20 mA
and G3PX
Note: Turn the Internal DUTY Adjuster
fully to the right.
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