Electrical Test Instruments PI-2500-G2 & PI-5000-G2
Section II - Detailed Description
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Page II-6
rectified and filtered by the metering PC board and displayed on the panel me-
ter.
Output is inhibited during tap change or when an interlock condition exists. An
interlock (INTLKB) will be asserted if either temperature readouts exceed an ad-
justed setpoint.
The Vernier position signal is supplied to the PC board and displayed as a 0-
100% reading on a ten segment LED bar graph. The signal is about 1.0 to 4.0
VDC.
The bus temperature is from a 10 K ohm thermistor. System temperature is a
variable voltage from the POD, as discussed elsewhere. Circuitry in the PC board
converts these signals to voltages which are displayed on multicolor bar graphs.
When the signal exceeds that which lights one red bar, the interlock is tripped.
The output voltage of the test set is supplied at jacks J1 and J2.
Indicator Control Panel
Input Voltage Meter: This LED panel meter indicates the approximate input
voltage applied to the test set.
Control Power ON switch: This green switch turns on 120 VAC control power to
the test set, and its green lamp lights when ON.
Control Power OFF switch: This red switch turns off the 120 VAC control power
to the test set.
Main Power READY switch: This green switch turns on the main power to the
output section of the test set, and its green lamp lights when ON.
Main Power INTERLOCK switch: This red switch turns off the main power to the
test set. It lights if an interlock condition is detected.
Output ON indicator: This yellow lamp lights when output voltage is ON.
Output Voltage jacks: These banana jacks are connected to output stabs 1 and
8 in the PI2500, and stabs 1 and 4 in the AUX-5000 and may be used to monitor
voltage on the breaker with a DMM.
Thermal Status - Bus: This multicolor bar graph indicates approximate temper-
ature of the output bus. Green bars indicate normal temperature. Yellow bars
indicate significant heating, and heavy testing should be postponed until unit
cools. Red bars indicate overheating, and unit must cool to yellow range before
testing. Output initiation will be inhibited if second red bar lights. Excessive
temperature may indicate poor output connections.
Thermal Status - System: This indicates temperature of the output section, and
other conditions, as determined by the POD. A thermistor in the winding of the
first section of the output transformer provides actual temperature, but the
