Miller Electric CBI 801D manual Installation or Relocation, Duty Cycle, Description

3-1. DUTY CYCLE

The duty cycle of a welding generator is the percentage of a ten minute period that a welding generator can be operated at a given output without causing overheating and damage to the unit. This welding generator is rated at 100 percent duty cycle when operated at 800 am- peres. This means that the welding generator can be op- erated at 800 amperes continuously without causing damage to the unit.

3-2. VOLT-AMPERE CURVES (Chart 3-1)

The volt-ampere curves show the voltage and amper- age output capabilities of the welding generator at mini- mum and maximum of each coarse range. Curves of other settings fall between the curves shown.

Chart 3-1. Volt-Ampere Curves

and Air Carbon Arc Cutting And Gouging (CAC-A) pro- cesses.

The unit is equipped with a four-cylinder, air-cooled, Deutz diesel engine (F4L-912). The air compressor in this unit is mounted on the front of the engine, and it op- erates whenever the engine is running. The compressor delivers 12 cfm of air at a pressure of 100 psi (see Chart 3-2).

In addition to welding and air compressor operation, this unit can provide up to 3 kVA/kW of 120 volts (26 am- peres) ac electrical power for operating 50/60 Hz or 60 Hz auxiliary equipment while welding.

This unit is specially prepared for operation in harsh and corrosive environments.

An optional Ether Starting Aid can be provided on the welding generator and is covered within this Owner’s Manual.

Chart 3-2. Air Output Curve

3-3. DESCRIPTION

This unit is a constant current (CC) dc arc welding gen- erator designed for use with the Shielded Metal Arc Welding (SMAW), Flux Cored Arc Welding (FCAW),

SB-143 883

IMPORTANT: Unless otherwise specified, all direc- tions, such as left or right, are with respect to the opera- tor facing the welding generator front panel.

4-1. LOCATION (Figure 3-1)

A proper installation site should be selected for the weld- ing generator if the unit is to provide dependable service and remain relatively maintenance free.

WARNING: ENGINE EXHAUST GASES can kill.

•Operate in open, well-ventilated areas or if operated indoors, vent engine exhaust out- side the building.

•Keep engine exhaust vent outlet away from building air intakes.

CAUTION: RESTRICTED AIRFLOW causes overheating and possible damage to inter- nal parts.

•Maintain at least 18 inches (457 mm) of unre- stricted space on all sides of unit, and keep underside free of obstructions.

•Do not place any filtering device over the intake air passages of this welding generator.

Warranty is void if any type of filtering device is used.

The service life and operating efficiency of this unit are reduced when the unit is subjected to extreme levels of dust, dirt, moisture, corrosive vapors, and extreme heat.