ENTRON Controls, LLC. • 700120S • Page 23
3.6 WELDING TRANSFORMER PRIMARY WIRING
SCR OR IGNITRON TUBE CONTACTORS
WHEN POWER IS ON, ALL EXTERIOR SURFACES OF THE IGNITRON TUBES
AND SCRS CARRY HAZARDOUS VOLTAGES.
CONTACT WITH THESE DEVICES MAY CAUSE SERIOUS OR FATAL INJURIES.
1. For your convenience, many electrical and mechanical connections have been performed at
the factory. Check ALL electrical connections to ensure that all connections are tight.
Connections may loosen during shipping.
2. Connect the L1 lead from incoming power to the L1 connection located on the contactor
assembly. Connect the H1 lead from the welding transformer to the H1 connection located
on the contactor assembly. Follow machine manufacturer’s recommended wire size for
installation. A connection from L2 must be made to TS1-CTH4/L2 to provide power to the
control circuitry. Refer to the Wiring Diagram for other connections.
3. When control is supplied with a circuit isolation device, L1 is factory installed and the L2
control wire is connected to TS1-CTH4/L2.
Connect a chassis ground to the lug provided on the right wall of the control cabinet and to an
external earth ground. A good earth ground is necessary for proper control operation.
3.7 EXTERNAL SCR CONTACTOR WIRING
External SCR Contactor wiring is shown on Figure 3-14. Connectors J5 and J6 are mounted on
PCB2. J12 is located on PCB1.
Table 3-1. External SCR Contactor connections
For more information, refer to appropriate Wiring Diagram (see front page).
Do not over tighten J5 or J6.
NOTICE
NOTICE
DANGER
Terminal Connection Description
TS1-L1 Connect to contactor L1 terminal
TS1-H4/XH1 Connect to contactor H1 terminal
TS1-L2/CTH4 Connect to circuit isolation device L2
J5-C Connect to the cathode of SCR1
J5-G Connect to the gate of SCR1
J6-C Connect to the cathode of SCR2
J6-G Connect to the gate of SCR2
J12-B
Connect to the current coil (EN1001 only )
J12-W
Connect to the current coil (EN1001 only )
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