ETI PI-800 Instruction Manual page 16

Electrical Test Instruments MAC-21
Section III – MAC-21
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Interlock/Stop switch S4: This red switch turns off the main output of the test
set by deenergizing contactor K1. Its lamp lights when there is an interlock con-
dition.
Output ON lamp DS5: This yellow lamp turns on when test set output is ON.
Interlock Bypass Switch S5: This yellow switch, when held ON, bypasses the POD
interlock. This should be used only if there is a defect in the POD circuitry. Dam-
age to the test set may result if abused.
Tap Selector Switch S2: This seven-position switch is used to select the desired
coarse output tap. Positions 4-7 are used only for the PI-1600. Never change
output tap while output is on. The output is deenergized between taps, but
damage to the test set may result if output is not turned off before changing
taps.
System Status LEDs DS10-DS12: These multicolor LEDs indicate approximate in-
ternal temperature of the test set. The Green LED indicates normal tempera-
ture. A Green+Yellow LED indicates slight heating, and a Yellow LED indicates
moderate heating. A Yellow+ Red LED indicates significant heating, and heavy
testing should be postponed until unit cools to Yellow. A Red LED indicates se-
vere overheating, and the unit will soon trip the interlock. Allow the test set to
cool to Red+Yellow range before testing. Temperature indication is a combina-
tion of actual bus temperature and "virtual temperature" as determined by duty
cycle usage. The virtual temperature will be reset if test set power is turned off,
but actual temperature will be indicated.
Output LEDs DS7-DS9: These multicolor LEDs indicate approximate overload
current of the test set. The Green LED indicates current up to about 1x, where
the test set may be used continuously. Green+Yellow indicates about 2x, and
Yellow indicates 3x. The test set may be used for up to about 5 minutes ON time
at 3x, followed by at least 5 minutes cooling. Yellow+Red is about 4-7x, and Red
is about 8-10x. These overloads may be sustained for only about 5 seconds or
less. Red+Yellow+Green indicates a severe overload which will trip the interlock
within 0.5 seconds. The output LEDs hold their reading for several seconds. If
interlock is tripped, the Red LED will flash until clear.
Vernier Adjust Knob: This knob adjusts the output Vernier. Clockwise rotation
increases output in all tap positions.
Aux Unit Power Jack J6: This female three position jack is used to supply main
power to the PI-AUX Booster Unit for the PI-1600 configuration. Voltage may be
present on this connector anytime the interlock contactor is closed. A safety
cover or other means should be used to prevent inadvertent contact with ener-
gized conductors when the PI-AUX unit is not connected.
Aux Unit Control Jack J1: This female 14 position jack is used to supply 120 VAC
control signals and 12 VDC power to the PI-AUX Booster Unit for the PI-1600
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