CHOWEL WELCOM-250Y, Maintenance Manual

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WELCOM-250Y, Z MAINTENANCE MANUAL
CHOWEL
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1. Specification of WELCOM-250Y,Z
1-1 Voltage and Frequency
. Welding power supply : Single phase AC440±15%
50/60Hz Automatic selection
. Control power supply : Unnecessary due to be fed from a
voltage dropped welding power supply.
. Power consumption : 50VA (No working condition)
1-2 Environments
. Temperature : -5
℃ ∼
+ 50
℃
( 23
℉ ∼
122
℉
)
. Humidity : 90% or less without dewing
1-3 Cooling Condition
. Controller : Natural air cooled
. SCR : Water cooled
Temperature at water inlet : 30
℃
or less
(86
℉
or less)
Quantity of water : More then 5 liters per minute
(More then 1.321 gallons per minute)
Cooling water pressure : Max. 3Kgf/
㎠
Resistively : More then 5000 ohms/centimeter
(More then 1969 ohms .inch)
1-4 Control Element : SCR size D
(900A / 1200V 100% duty cycle)
1-5 Current Control System : Synchronous phase control by SCR.
1-6 Weld current control method
. Constant current control : Loop control by primary current feedback
. Voltage compensation control : Open-loop control by measuring
welding power supply.
1-7 Control Range
. Firing angle control range : 20 - 135 degrees
. Pri, current control range : 50 - 1500amps (limit by SCR size)
. 2nd current control range : 2.0 KA - 25.5 KA
. Turn ration of transformer : 1.0 - 199.9