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steps, blower motor circuits, control circuits, and safety circuits. Electrical energy from the power
source under test is absorbed by the load bank resistors and converted into heat. The blower motor
provides the necessary cooling airflow to cool the resistor load elements. The Load Bank Unit contains
all of the necessary principle system components for control and operation.
Load Circuits
: Including load power resistors, load step switching and main input load bus.
Cooling System
: Including integrally powered blower motor and controls.
Control Circuits
: Including 120 VAC controls, load application circuits, blower circuits, and
indicators.
Automatic Load Dump Circuit
: Provides user interface provisions to disconnect and disable
all load steps from a remote device.
Safety Circuits
: Including branch circuit protection for load power resistor circuits, protection
for blower and control circuits, motor overload protection, exhaust over temperature protection,
cooling air-loss protection, wrong voltage protection, load dump indication, and E-Stop.
The Load Bank should never be used without the Fan Blower Motor operating. Inadequate
cooling airflow will result in resistor load elements overheating, fire hazard, and danger to
personnel.
Operating Instructions
General
All installation should be reviewed and checked by a qualified technician with all local and
National Electric codes observed.
Ensure all connections are properly tightened and all covers are installed.
Never operate the unit un-attended.
All wiring from external power sources to Load Bank Unit should be verified and checked by a
qualified technician with all local and National Electric codes observed.
All interconnection wiring of Operator Control Unit and Load Bank should be verified and
checked by a qualified technician with all local and National Electric Codes observed.
The following Cautions and Warnings should be strictly enforced:
CAUTION
Operation of the unit with any covers removed will disrupt air flow and allow debris to pass through
resistors possibly damaging equipment.
WARNING
Operation of the unit with any covers removed will pose a shock hazard and danger to personnel.
WARNING
Do not look into the exhaust of the enclosure while in operation. Exhaust temperatures can reach
temperatures in excess of 500ºF when unit is under load and in operation. Dust and or debris may also
be present.
WARNING
Do not touch the enclosure surfaces while the unit is in operation. Enclosure surfaces are hot and
exhaust temperatures can reach in excess of 500ºF when unit is under load and in operation.
WARNING
Do not insert a screwdriver or any thin metal objects through the perforated cooling air grilles while the
load is in operation. The power within the unit could arc over and will cause serious injury to personnel
and damage to the unit.
WARNING
Do not operate under load without fan blower in motion. Immediate equipment damage may result.
