Cable Length Compensation (For Cv Process); Enabling Voltage Reducing Device (Vrd) - Miller Trailblazer 330 Diesel Owner's Manual

6-6.

Cable Length Compensation (For CV Process)

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Refer to Section 6-4 for enabling Cable Length Calibration (CLC)
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Use of Auto-Set requires WLC or CLC to be enabled.
CLC is a another method for overcoming voltage drop when using long cable runs and the CV process. CLC uses a test weld to measure the
exact voltage drop from your weld cables. It provides a voltage increase from the power source to achieve a voltage on the electrode at the
display set point.
A new test weld will be performed each time the feeder binds with the unit. This happens when the unit is first powered on and each time the
cables are disconnected and reconnected. The test well will be the first weld performed after binding. The voltage may be higher than the set
point on the first test weld.
CLC and WLC can each be used on their own, but to get the best results with overcoming voltage drop use the two features together. The
power source will first use the data entered from WLC to apply the voltage drop offset to the first weld. This will eliminate the need for a sepa-
rate test weld, as WLC will compensate for the voltage during this weld. After the first weld CLC will be used for the remaining welds. The ac-
tual voltage at the wire feeder will be even more accurate than using each of the features separately.
CLC will compensate for the age and condition of cables and the amount of connections used.
6-7.

Enabling Voltage Reducing Device (VRD)

Unit can be configured for low open circuit voltage (OCV) operation by enabling Voltage Reducing Device (VRD). When VRD is enabled, a
low sensing voltage (approximately 18VDC) is present between electrode and workpiece prior to electrode touching workpiece.
Feature can be turned on by accessing Settings Screen by pressing Menu button, then selecting System Settings. In System Settings
Screen, select VRD, then select Enabled. When enabled, display shows 18V OCV instead of normal OCV. Feature can be used when weld-
ing in confined areas.
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