Page 30 • 700120S • ENTRON Controls, LLC.
4.2 FUSING AND SAFE OPERATION
CONTROL FUSE For “S”, “E”, “T/D”, and “L” Cabinets – This fuse, a 1/4 A, is used to
protect the control circuits. The fuse holder is located in the upper left
corner of the contactor door opening or within the “S” Cabinet.
Fusing for “C” Cabinet is different than other cabinets. In “C” cabinets,
three 1.25 A fuses are used. L1, H2, and H1 connections are all protected.
These fuses protect control circuits, sense circuits, and valve transformer.
VALVE FUSES These fuses, a 2AG 1 A, are used to protect the valve circuits. These
fuses are located on the Terminal Strip PCB.
IGNITOR FUSES These fuses, BAF 6 A, two per contactor (supplied with ignitron tube
retrofit controls only), are used to protect the ignitor circuits of the ignitron
tubes. The fuse holders are located on the Ignitron Firing Board Module
(A/N 410318).
INSTALL PROPERLY SIZED FUSES IN SERVICE DISCONNECT SWITCH.
CHECK WELDING MACHINE MANUFACTURER’S RECOMMENDATIONS.
VOLTAGES PRESENT IN THIS CONTROL CAN CAUSE SEVERE OR FATAL
INJURY. DO NOT SERVICE ANY COMPONENT WITH POWER ON.
USE ONLY THE FUSE TYPE SPECIFIED TO MAINTAIN SAFE OPERATION.
Observe the WARNING, DANGER and CAUTION labels affixed to the control to maintain
safe operation. Some of them are shown in Figure 4-3.
Figure 4-3. Warning, Danger and Caution labels
CAUTION
DANGER
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