TPCMQ DC/DC CONVERTER SERIES
OPERATING MANUAL
19
C O R P O R A T I O N
17.0 INSTALLATION
17.1 Mounting.
The TPCMQ Series converter rack/shelves are mounted in a
rack by means of mounting brackets on each side. One set of standard
brackets is supplied with each rack/shelf. The rack/shelf mounts in a 19-
inch rack, but brackets are available for mounting in a 23-inch rack (order
no. 775-1451-0000, set of two). There are seven different bracket positions
on the side of the rack/shelf, from front position to 6 inches from the front.
When mounting, the rack/shelf should fi rst be securely mounted to the rack,
then the converter modules inserted into the rack/shelf. The converter mod-
ules should be secured by tightening the jack screw on each module.
17.2 DC Input Connections.
The DC input connections to the converter rack/
shelf are shown in Figure 4. As shown, there are separate bus bar connec-
tions for each converter module. The stud connections, labeled by con-
verter module number, are no. 10-32 for TPCMQR1U3-48 and no.8-2 for
TPCMQR1U3-24. Shorting bars are available for each rack/shelf so that all
three inputs are in parallel. See data sheets in Appendix for ordering infor-
mation.
17.3 DC Output Connections.
The DC output connections are shown in Figure
4. The positive and negative output connections are made to the copper
bus bars as shown. The left bar is positive and the right one negative. Each
bus bar has a no. ¼ - 20 stud with nut. The output wires or bus bars should
be sized in accordance with the load current and length of conductor.
17.4 Contact Resistance.
Connection to the input and output bus bars should
be clean and tight to minimize contact resistance.
17.5 Control and Supervisory Signal Connections.
These connections
are made to J4, a subminiature D, 25-pin connector (Positronics No.
SD25F0S5OOX) by means of the mating connector. Details for these con-
nections are given in Section 14.
17.6 Cooling.
Each converter module is cooled by three 40 mm DC ball bearing
fans. For proper cooling, the area in front of the fan and around the air exits
should be kept clear for unimpeded air fl ow.
