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 Thermal control unit for a heater |
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Single-phase Three-phase thyristor-control unit |
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TOYO
Paracon XP series |
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 How
to Select Model Type
Typical
Application
Steel
industry
Used
in a heater for heat-treating metal, etc.
As high capacity, special
heaters that can withstand a high temperature are often used,
phase control types are used. |
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Semiconductor
industry
Used
in constant temperature baths, etc. that require delicate temperature
control.
Both
phase control and zero-cross control types are frequently used. |
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Molding
equipment industry
Used
in heaters for injection molding equipment, etc. for controlling
temperature.
Phase control types
are mainly used. |
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Air
conditioning industry
Used
in air conditioning equipment including ones for clean room and
operating room for controlling temperature and humidity.
Zero-cross control types are often used as general heater
of nichrome is often used in places where equipment should receive
minimum noise.
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Food
processing industry
"Paracon"
works like a chef in controlling temperature to equalize the extent
of baking bread, cookies, pizzas, etc. |
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Ceramic
industry
Controlling
technology of the "Paracon" is highly-esteemed in burning
ceramics including IC chips using very high temperature (1500
to 1600 degrees Centigrade)
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Painting
industry
Temperature
control
function of the "Paracon" is adopted as inevitable system
in improving quality when equal and even baking finishing is required.
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TOYO Paracon has rich functions and works greatly in controlling temperature
of heaters.
Standard function
Manual setting, soft start / shutdown, gain setting, operation
command
input, setting change signal, current-limiting function, operation
change
input, thyristor / load open error detection.
Error detection function
Frequency judgment error, fuse breakage error, temperature error,
thyristor / load open error, overcurrent error, heater breakage
error,
instantaneous interruption error, communication error (option)
Open
phase / negative phase for 3-phase type only.
Optional function
Current regulating function, voltage regulating function + current-
limiting function, power regulating function + current-limiting
function, heater breakage function, sheet-key setting unit (XP-SK).
Other functions
Error output / Heavy error · light error. Instantaneous
interruption
detection function, overheat protection function, main circuit
protection. |
Option |
"Sheet-key
setting unit XP-SK" is available as an option for facilitating
maintenance.
The equipment indicates function settings
and load status data of various optional functions with
lamps. "Error code" corresponding with the detected
error is shown with 7-segment indication when a error is
detected in current, voltage or power load to facilitate
maintenance. |
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There are two control methods
Phase
control
Power supplied to the load can be controlled
continuously and the phase control is suitable for wide range
of power control including that for general heater to a heater
having large resistance change such as one in electric furnaces
and air conditioners.
Behavior outline
Conduction
time (firing angle) per cycle of AC power is controlled to
adjust
AC power.
Output waveform chart
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Zero-cross
control (Cycle control)
The zero-cross control uses a firing system
wherein a thyristor is turned on when the voltage of the AC power
is zero and is suitable for controlling heaters close to instrumentation
lines where noise should be minimized.
Behavior outline
AC
power is adjusted by changing conduction cycle (On time) during
one
period,
which is cycles of AC power (in case of 50Hz and 2 seconds
setting).
Output waveform
* Zero-cross control is switched with external contact. |
The application load of the Paracon is compatible with the following
heaters.
General
heater
General heater refers to heater with small resistance
change caused by heater temperature such as nichrome or iron-chromium
one. Standard units are optimal for controlling the load and optional
functions can be added on request.
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Precious
metal heater
Precious metal heater refers to heater with
very large resistance change of about ten times caused by temperature
of heater such as pure metal heater including platinum, molybdenum,
kanthal, or tungsten and nonmetal heater including molybdenum
silicide. The current-limiting function [standard] and
current regulating function (optional) are optimal for controlling
the load. |
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Silicone
carbide heater
Silicone carbide heater refers to a heater whose
resistance is changed greatly by heater temperature and electric
resistance varies across the age due to wear of the heater. The
current-limiting function (standard) and power regulating function
(optional) are optimal for controlling the load. |
Specifications
Number of phase |
single-phase / three phase |
Rated current |
20A to 600A (refer to selection table) |
Input frequency |
50 / 60Hz |
Input voltage |
100 / 110V, 200 / 220V, 400 / 440V  10% |
Main circuit configuration
(Module) |
single-phase : thyristor + thyristor
Three-phase : thyristor + diode |
Cooling method |
single-phase XP1-020 - 150A self cooling XP1-200
- 600A fan cooling
three-phase XP3-020 - 100A self cooling XP3-150 - 600A fan cooling |
Control method |
phase control / zero-cross control |
Applicable load |
General heater, Precious metal heater, Silicon
carbide heater (controllable with primary transformer) |
Output adjustable range |
0 to 98% or wider (with respect to power voltage) |
Input characteristics |
linearity 3%
FS (output 10% to 90%) |
Control power |
external supply system (same power as the main
circuit power) |
Setting system |
automatic / manual, two-position setting |
Dielectric resistance |
2000V 1 minute (at 200V system), 2500V 1 minute
(at 400V system) |
Insulation resistance |
10MOhm or more with a DC500V megohmmeter |
Operating temperature |
0 to 50  C |
Storage temperature |
-20 to 70C |
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Eleven types with current rating of 20A to 600A are 
