Page 23
PCHS/TPCHS SERIES Quick-Set PowerCassette®
INSTALLATION & OPERATING MANUAL
Manual No. tpchs-2
pchs-tpchs-man-rev2-1214.indd
17.6 Control and Supervisory Signal Connections.
These connections are made to various
pins on the large Positronic connector on the PowerCassette. See Figure 5. For the racks
they are made to various pins on the P2 connector. See Figures 10 and 11. Details for these
functions are given in Section 16.
17.7 Rack Connection of Warning Signals.
Normally signals are used for identifying the status
of each module in paralleled unit configuration. If it is desired to connect all the signals
together to treat the complete rack as a single power supply, the following (or equivalent)
must be done. The input Power Fail, Output Power Good and Overtemp. Warning signals of
each module are each connected to the anode of a BAV99 diode, the other side of which goes
to the base of a 2N2222A transistor. The collectors of all the Input Power Fail transistors are
then connected to form a single Input Power Fail chassis signal. The same is done for the
Output Power Good and Overtemp. Warning signals. The resultant system warning signals
then give a Logic Low for Input Power Fail and a Logic High for Output Power Good and
Overtemperature Warning.
17.8 Cooling.
Each PowerCassette is cooled by three 40mm DC ball bearing fans. For proper
cooling, the area in front of the fans and the back of the unit should be kept clear for
unimpeded air flow.
18.0 MAINTENANCE
No routine maintenance is required on the Quick-Set PowerCassette Series except for periodic
cleaning of dust and dirt around the fans. A small vacuum nozzle should be used for this.
19.0 SETUP AND TESTING
19.1
The Quick-Set PowerCassette can be initially tested mounted in a compatible rack or on a
test bench. If two units are to be tested in a rack, they should first be individually tested in
Position A (left side) of the rack.
19.2 With the input power source turned off, connect input power wires to the PowerCassette
mating connector or in case of the rack, to the input connector of the rack. If the rack has
dual input connectors, connect the power wires to the “A” (left) side of the rack. Make sure
that the safety ground wire is connected.
19.3 Connect resistive power loads across the output pins or connections for each of the outputs.
The loads should be 20% to 50% of full load values and can be either power resistors or
electronic loads set to the resistive modes. Make sure that the power resistors have adequate
heat sinking and cooling.
19.4 Connect color-coded, twisted pairs (no. 22 or 24 AWG) for each set of remote sense pins
(V1, V2 & V3) on the mating connector to each respective load.
The +Sense pin must
go to the positive side of the load and the -Sense pin to the negative side of the load.
Also connect the Enable pin, pin 27 of the large Positronics mating connector of the
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
