Omron G3PW, Руководство пользователя

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G3PW Features Section 1-2
1-2 G3PW Features
1-2-1 Features of Constant-current and Standard Models
Phase control or optimum cycle control can be selected by using either event
inputs or the keys on the front panel. Inrush current can be suppressed by
selecting phase control with the soft-start up/down functions at startup and
high-frequency noise can be suppressed by switching to optimum cycle con-
trol when in a steady state.
A Wide Selection of Output Modes Is Available for Phase Control
With phase control, any of the following modes can be selected for the input
signal or external setting: a mode with the output proportional to the phase
angle, a mode with the output proportional to the voltage, a mode with the out-
put proportional to the square of the voltage (i.e., the power), or a mode with
the output proportional to the current (constant current mode, see note).
Note Constant-current Models only.
Soft-start Up and Soft-start Down Functions
The soft-start up and soft-start down functions are used to change the output
value gradually within a set rate of change, even when the input value
changes suddenly. You can set the time for the output value to go from 0% to
100% or from 100% to 0% to 0.0 to 99.9 s.
Duty Setting
The duty setting is used to set the rate of change from 0% to 100% of the out-
put value in relation to the input value.
Base-up Function
The base-up function increases the output value so that the output value does
not go to 0% even when the input value is 0%. This enables preheating the
heater even at an input value of 0%, which is effective when using a load for
which the heater temperature increases slowly.
Output Limit
The output limit is used to set upper and lower limits for the output value.
Instead of adjusting the rate of change of the output value in relation to the
input value, it enables upper and lower limits to be set on the current flowing
to the heater.
Total Run Time
Exceeded Detection
The total run time exceeded detection function outputs an alarm when the
total run time exceeds the preset Total Run Time Monitor value (kh). The total
run time can be monitored for notification of the need for replacement or pre-
ventive maintenance of the Power Controller or heater.
1-2-2 Features of Constant-current Models Only
Constant-current Control for Controlling a Pure Metal or Nonmetal Heater
Constant-current control measures the load current with a built-in CT, and
controls the load current so that it is proportional to the input. This stabilizes
the heating values of heaters (pure metal or nonmetal) for which the resis-
tance changes due to temperature changes or deterioration over time.
Current Limit for the
Load Current
The current limit function measures the load current with a built-in CT and pro-
tects the heater by adjusting the phase angle to limit the load current so that a
preset load current limit is not exceeded. It is also used together with the soft-
start functions to limit the inrush current for pure-metal heaters and nonmetal
heaters.