Electrical Test Instruments PI-2500-G2 & PI-5000-G2
Section II - Detailed Description
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Page II-4
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.
Illustration of PI-2500 Stab Plate Assembly:
AUX5000 Main Unit Circuitry
The AUX-5000 auxiliary unit connects to the 2500 one amphenol connector and
4 buss bars. Primary protection is provided by 200-amp fuses F1 and F2. Main
power is supplied to the output section by power contactors K1 and K2, which
are energized main power in the PI2500 is turned on.
The control connector to the PI5000 provide ACHI and ACLO power for the fan,
control signals and power for the contactors, interlocks, and sense leads for the
output bus voltage from terminal 1 to 4.
The secondary windings of the transformer, consisting of two pairs of bus bars,
are bolted to the secondary bus bars of the mating PI-2500. The combined units
form a transformer which is nearly identical to the PI4000B.
The high strength and corrosion resistant stainless-steel output bolts should
rarely require replacement but may be serviced by simply removing the sixteen
screws on the phenolic output faceplate, and then removing one of four bolt
retainers. The standard hex head bolts may then be pushed through and re-
placed.
