Electrical Test Instruments PI-2500 & PI-5000
Section II - Detailed Description
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Page II-13
voltage balance on the series connected pairs, and also provide a resistive load
to stabilize the SCR controller at low output settings.
The secondary currents from T4 and T5 are monitored by the Programmable
Overload Device (POD), which also measures actual temperature in the primary
winding of T1A. The overall system status is displayed on the bar graph of the
indicator control panel, and an interlock relay shuts down the output of the test
set if abnormal conditions are detected. More details are in a separate manual.
The PI-2500 features a very efficient low impedance output transformer with
enhanced reliability and cooler operation due to single piece secondary bus
conductors. It was designed so that it could provide three connection modes
for 1000, 2000, and 4000 amps continuous current. Stab Adaptor Plates and se-
ries bars are used for convenient output connection. The output bus connectors
are slotted so that the hardware can be loosened and removed or replaced eas-
ily. A slotted brace is supplied that helps with alignment. See the following illus-
tration for details:
