ETI AT-10B User manual

Overview:
This portable autotransformer allows the PI-800 and PI-1600 circuit breaker testers to be used at full
capacity on 480 VAC lines. It provides 240 VAC at 10 kVA, and also it is housed in a rugged ABS
enclosure approximately 22” wide x 11” high x 22” deep, including 2” lids, and weighs less than 90 lbs.
Basic Description and Operation:
This instrument is housed in a rugged waterproof case with removable front and rear covers. The input
connection is by way of two 50 A male connectors and a ¼” ground lug. Female plugs are provided for
the customer to make cables as required. The input is protected by high interrupting capacity 30
ampere circuit breaker. When input power is applied, POWER ON light is illuminated. When the circuit
breaker is energized the OUTPUT ON light is illuminated 240 VAC on two 50 A female connectors.
In the case of long term overload and subsequent overheating of the autotransformer, thermal overload
switches will open. It is the responsibility of the user to remove the load if this occurs. The unit should
remain powered up so the fans may remove heat from the enclosure.
It is extremely important to check the input voltage before applying power that is is connected to the
AT-10B INPUT JACKS. If 480 VAC is applied to the OUTPUT JACKS this will present a dangerous
condition which may damage the unit or cause injury to the operator. It is good practice to connect the
unit in the following sequence:
Inspect the input jumper to make sure it is tight and properly set.
Measure the input power source to verify it is within the limits of the AT-10B as congured.
Connect the input ground terminal to a solid earth ground.
Connect the output ground terminal to the PI-800.
Connect the power leads from the AT-10B output jacks to the PI-800 input jacks.
Connect the input leads of the AT-10B to a de-energized power source.
After both Input and Output cables are properly connected energize the power source and turn on
AT-10B using the circuit breaker and verify that both the Power On and Output On lamp lights
illuminate.
Electrical Test Instruments, LLC
AT-10B
10KVA Autotransformer

Electrical Test Instruments, LLC
Width: 21.5 inches (546 mm)
Height: 11.5 inches (292 mm)
Depth: 22.5 inches (572 mm)
Depth (lids): 2.0 inches (51 mm)
Weight: 87 pounds (38.5 kG)
Input (480V): 420-520 VAC, 60 Hz, 10 kVA nominal (21 amperes)
Output (Main): 240 VAC at 40 A continuous (9.6 kVA)
Overloads:
200% 30 seconds ON, 90 seconds OFF (25% Duty Cycle)
300% 10 seconds ON, 90 seconds OFF (10% Duty Cycle)
1000% 0.3 seconds ON, 30 seconds OFF (1% Duty Cycle)
Included Accessories
• Input power plugs 1 pair
• Technical manual 1 copy
• Output Cables 1 set
SPECIFICATIONS
AT-10B
Autotransformer