Page 18
3.7 COOLING REQUIREMENTS FOR CONTACTORS
SOLID STATE MANUFACTURER'S COOLING RECOMMENDATIONS
600 A - SCR Solid State Contactor
1200 A - SCR Solid State Contactor
1800/2200 A - SCR Solid State Contactor
1 GPM at 104°F (40°C) maximum inlet temperature.
Be sure power to an electronic contactor is turned off when water is turned off.
With a voltage applied, most water will ionize and begin to conduct current between points
of high differential voltages. This current is sufficient to heat the water past the boiling
point, creating steam and possibly causing the rubber hose to burst. The water spraying over
the high voltage circuit can cause considerable damage to the contactor and, most likely, the
control circuitry as well. Never use metallic or other conductive tubing to plumb a water
cooled resistance welding contactor. Heater hose has a very high carbon content and should
not be used for contactor plumbing. A low carbon, reinforced hose (such as the hose
originally supplied with the unit), no less than 18" long, must be used to connect the heat
sinks to each other and to the bulkhead fitting on the inside wall of the cabinet, see plumbing
instructions on wiring diagram.
The EN1000 water cooled SCR contactors are electrically isolated from the electrical circuit
within the contactor section. No minimum length of water hose is required for electrical
isolation of the contactor. It is still recommended to turn power off when the control is not
in use.
WATER OFF - POWER OFF
POWER ON - WATER ON
For all water cooled heatsinks, be sure water is turned ON before placing welder in
operation. An open drain is recommended for best operation. If a closed return system is
used, be sure return line is properly sized so that back pressure will not reduce water flow
below recommendations. A sight flow indicator is recommended.
StockCheck.com
Содержание EN1000 series
Страница 2: ...S t o c k C h e c k c o m ...
Страница 19: ...Page 17 Figure 3 6 External SCR Contactor connection S t o c k C h e c k c o m ...
Страница 120: ...Page 118 11 3 TROUBLESHOOTING GUIDE S t o c k C h e c k c o m ...
Страница 121: ...Page 119 S t o c k C h e c k c o m ...
Страница 122: ...Page 120 11 4 BLOCK DIAGRAM S t o c k C h e c k c o m ...