CHAPTER 1: SYSTEM DESCRIPTION
THERMOCOUPLE WELDER
990-070
1-3
Line Voltage Regulator
The Line Voltage regulator ensures that the welds are independent of changes in line voltage by
maintaining the voltage on the capacitor bank within ± 0.25% of setting for a ± 13% change in line
voltage.
Turndown Circuit
The Turndown Circuit allows the user to reduce the energy setting by using the Wire Gauge Selection
Control. The excess energy stored in the capacitor bank is dissipated internally. The Turndown Circuit
dead-band is approximately 0.6% of the full scale voltage.
Line Failure Turndown
The Line Failure Turndown is a safety feature which ensures that the capacitor bank is automatically
discharged whenever the input power is interrupted.
Weld Fire Lockout
This feature helps prevent poor welds by inhibiting firing of the TCW until the energy stored in the
capacitor bank is within 1% of the pre-selected value.
Power Switch
A rocker switch disconnects both sides of the input power line when switched to the “OFF” position.
Weld Ready
A yellow lamp indicates that the capacitor bank has been charged or discharged to the proper voltage
level and is ready to make a weld.
Wire Gauge Selector
The Wire Gauge Selector controls the level of stored energy necessary to make a thermocouple weld.
Energy levels are indicated for each American Wire Gauge (AWG) from 38 AWG to 20 AWG.
Because of variations in the thermocouple wire diameters and in the melting characteristics of the
various thermocouple alloys, it may be necessary to increase or decrease the WIRE GAUGE
SELECTOR setting to produce a good thermocouple weld. This control may also be used to increase or
decrease the size of the weld bead to meet specific customer requirements.
Summary of Contents for TCW
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