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PCHS/TPCHS SERIES Quick-Set PowerCassette®
INSTALLATION & OPERATING MANUAL
Manual No. tpchs-2
pchs-tpchs-man-rev2-1214.indd
PowerCassette, to Signal Ground, pin 22. This must be done for the unit to operate.
When using the rack, the Enable pin is automatically connected to Signal Ground in the rack.
The units are then controlled by the Inhibit inputs, P2 pins 1 and 13 of the two-unit rack or
pins 15, 20 and 24 of the three-unit rack. Connect the Global Inhibit, Pin 39, through a 10k
ohm resistor to +5V Standby, Pin 26. The same must be done for the Inhibit pins for each
module in the rack.
19.5 Checking Front Panel LEDs.
With the PowerCassette on the bench or in Position A of the
rack, turn on (or plug in) the power source. The Input Power Good (bottom left) green LED
should be on and the Output Power Good (bottom right) green LED should also be on.
19.6 Checking Output Voltages.
Measure each output voltage at its load with a digital voltmeter.
Each voltage should be within ±1% of its nominal value.
19.7 Checking the Inhibit Input.
Turn the input power source off. Connect a wire from the
Global Inhibit input (pin 39 on the PowerCassette large Positronics connector, pin 13 of P2
on the two-unit rack or pin 15 of P2 on the three-unit rack) to Signal Ground (pin 22 of the
PowerCassette large Positronics connector, pin 10 of P2 on the two-unit rack or pin 8 of P1
on the three-unit rack).
Turn the input power source back on. The Input Power OK green LED should turn on but
the Output Power Good green LED should remain off. Check the output voltages with a
digital voltmeter. They should read zero volts.
19.8 Checking the Input Power Fail and Output Power Good Signals.
Next check the voltage
on the Input Power Fail pin (pin 42 on the PowerCassette large Positronics connector , pin
25 of P2 on the two-unit rack or pin 14 of P2 on the three-unit rack) with respect to Signal
Ground (pin 22 of the PowerCassette large Positronics connector, pin 10 of P2 on the two-
unit rack or pin 8 of P1 on the three-unit rack). The voltage should be a logic LO, +0.5V or
less. Finally, check the voltage on the Output Power Good pin (pin 38 on the PowerCassette
large Positronics connector, pin 12 of P2 on the two-unit rack or pin 1 of P2 on the three-
unit rack) with respect to Signal Ground (pin 22 of the PowerCasssette large Positronics
connector, pin 10 of P2 on the two-unit rack or pin 8 of P1 on the three-unit rack). The
voltage should be a logic LO, +0.5V or less.
Disconnect the wire from the Global Inhibit to Signal Ground. The Output Power Good green
LED should turn on. Check the output voltage on the Output Power Good pin as described
above. The voltage should be a logic HI, or about +5V.
19.9
Testing the Other Power Cassette.
For a rack with two or three PowerCassettes, the other
PowerCassettes should be plugged into Position A in the rack and tested in the same manner
as above in Sections 19.2 to 19.8.
19.10 Testing the Complete Power Cassette Rack.
With the input power source off or
disconnected, insert all PowerCassettes into the rack. For a two-unit rack, connect resistive
power loads of approximately 80% of full load value for a single PowerCassette across the
outputs. For a three-unit rack connect resistive power loads of about 160% of full load value
QUICK-SET PowerCassette®
MODEL SUFFIX SELECTOR
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