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SAFETY PRECAUTIONS
Before installation, read and observe all safe- ty precautions throughout this manual.
WARNING
ELECTRIC SHOCK can kill.
•Turn the input supply power OFF at the disconnect switch or fuse box before working on this equipment.
•Do not touch electrically hot parts.
HOT EXHAUST can burn skin.
• Allow resistance elements to cool before working near them.
ROTATING FAN can cause injury.
•Do not touch moving fan components.
GENERAL DESCRIPTION
The Master Load 750 Load Bank is designed for elec- trically loading and testing power sources. The unit is designed for production line and job site use.
The total loading capability of the Master Load 750 is in fixed steps of 25, 25, 50, 50, 100, 250, 250 Amps
@50V AC or DC, totaling 750 Amps. Using the tog- gle switches on the control panel, any combination of the available load steps may be selected to achieve a desired load.
CONTROL UNIT
The loads described above are controlled from an integral control panel.
1.CONTROL POWER ON/OFF switch - Applies power to the load bank and starts the blower. The CONTROL POWER indicator lights when power is applied.
2.BLOWER FAIL indicator - Indicates an air fail- ure condition or insufficient cooling airflow.
3.MASTER LOAD ON/OFF switch - Allows instantaneous connection and disconnection
of all switched ON load steps.
4.LOAD STEPS switches - Connect and discon- nect load steps. Values are shown above each switch.
5.Analog Meters - Monitors DC volts, DC amps, AC volts, and AC amps applied to the load bank.
ENCLOSURE
CAUTION
The outside dimensions of the Master Load 750 Load Bank are listed on Technical Specifications page at the beginning of this section of the manual. The Load Bank is mounted on casters. One set of casters has lockable wheels.
Do not allow the Load Bank to be placed where hot exhaust air can recirculate back through the unit caus- ing a constant rise in cooling air temperature.
The Master Load 750 Load Bank contains a blower (approximately 82dBA at 3 ft.) which provides the nec- essary cooling air for the load elements. An exhaust temperature sensor is provided to monitor the exhaust temperature. This switch is electrically interlocked with the load application circuit. If an unsafe tempera- ture is detected in the exhaust of the Load Bank, the BLOWER FAIL light comes on and the load is discon- nected from the resistive elements.
Air to cool the load elements enters the screened intakes located on one end of the Load Bank. The air passes over the resistive elements and is then dis- charged through the screened opening at the other end of the Load Bank.
The Load Bank also contains fuses for short circuit protection. The control circuit is protected with a 15 amp fuse while the voltmeters are protected with 3 amp fuses.
WARNING
Do not operate the Load Bank with any screen or cover removed. This may expose the operator to high voltage and rotating fan blades.
CAUTION
Do not exceed the voltage rating of load resistive cir- cuit configuration.
MASTER LOAD 750