Specifications

20
POWERCASSETTE FRONT-END
OPERATING MANUAL
16.0 INSTALLATION
16.1 Mounting. The PowerCassette can either be mounted in the 19-inch rack
(model TPCM) and secured by means of the jack screw or it can be
mounted (model PCM) on another metal chassis by means of no. 4-40
screws into the four threaded inserts on the bottom of the PowerCassette. It
can also be mounted by the two no. 8-32 inserts on either side of the case.
Maximum penetration for each is 3/16-inch. Maximum torque on each insert
is 6 inch-pounds. See Figure 4.
16.2 Input Power Connections. AC input power connections are made to pins
22, 23 and 24 of the Positronics connector. A three-wire AC line cord should
be used with the safety ground connected to pin 22. See Figure 5.
16.3 DC Output Connections. The DC output connections for the
PowerCassette are shown in Figure 5. The output uses multiple, paralleled
pins on the Positronics connector, namely pins 1 to 6. Pins 1 to 3 are +V Out
and pins 4 to 6 are V Return.
16.4 Control and Supervisory Signal Connections. These connections are
made to various pins from 7 to 21 on the Positronic connector on the
PowerCassette. See Figure 5. Details for these functions are given in Sec-
tion 15.
16.5 Cooling. The 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. Option E of the PowerCassette
has two fans and a reduction in rated output power as shown in the table of
paragraph 3.1. See Figure 3. Reverse air flow models are also available.
17.0 MAINTENANCE
No routine maintenance is required on the PowerCassette Series except for peri-
odic cleaning of dust and dirt around the fans. A small vacuum nozzle should be
used for this.
18.0 POWERCASSETTE SETUP AND TESTING
18.1 The PowerCassette can be initially tested mounted in a rack or on a test
bench. If two units are to be tested in a rack, they should first be individually