Installation
Avtron Outdoor Load Bank • Part Number K875A 1035409
3-7
CONTROL CONNECTIONS
The control panel is mounted in a control enclosure. Connect terminals of the control panel to
terminals of the Load Bank as shown on Interconnection Diagram 1036580.
Control power is obtained from a 480:120 volt, 60 Hz AC, 750 VA transformer mounted on the
Load Bank and wired to the main Load Bank bus. Reference Schematic Diagram 1036579. For
Remote Load Dump, refer to Interconnection Diagram 1036580.
CONTROL INTERFACE CONNECTION POINTS
Sixteen (16) terminal block connections (TB300) marked GND, 1-6, and 10-18, are provided for the
control input scheme for automatic operation. These will be described in the operation section of the
manual. These terminals are located on the right side wall. Reference Interconnection Diagram
1036580.
ENCLOSURE HEATERS
A 100 watt strip heater is located inside the Load Bank enclosure on the control/blower panel. It is
controlled by a temperature switch. The heater is used to control condensation problems. The
switch is factory calibrated to 50F.
FAN/BLOWER MOTOR CONNECTION
The fan/blower circuit consists of fuses, a motor starter contactor, an overload relay, and the fan
motor. The blower input power connections are wired to TB1(19), (20), and (21) located on the
control/blower assembly and are then wired directly to the main Load Bank bus.
Required power for the blower motor is 480V, 3-phase, 60 Hz, 14 amps/phase.
Make sure that the correct phase rotation is wired to the fan motor. Improper phase rotation will
cause the fan to run in the reverse direction. The cooling air should be pushed from the fan, across
the resistor elements, and out the top exhaust hood/duct. This phase rotation check is mandatory
each time the source or fan connections are changed.
If fan rotation is incorrect, shut down the Load Bank and remove all power from the Load Bank.
Switch any two phase load cables at the Load Bank bus or any two input power connections at Load
Bank terminal block TB1(19), (20), and (21). Reference Schematic Diagram 1036579.
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