C O R P O R A T I O N
TPCMQ DC/DC CONVERTER SERIES
OPERATING MANUAL
20
18.0 MAINTENANCE
No routine maintenance is required on the TPCMQ48 or TPCMQ24 Series ex-
cept for periodic cleaning of dust and dirt around the fans. A small vacuum nozzle
should be used for this.
19.0 DC/DC CONVERTER AND RACK/SHELF SETUP AND TESTING
19.1
The converter modules and rack/shelf can be initially tested mounted in a
rack or on a test bench. The converter system is initially tested one con-
verter module at a time.
19.2
Connect DC power wires to converter module no. 1 bus bar connector on
the back of the rack/shelf. Do not connect the DC wires to the DC source
yet.
19.3
Connect a resistive power load across the DC output terminals. This load
can be a DC electronic load that is set to the resistive mode or a high-
power resistor that has the proper power capacity and cooling. For this
test the load should be between 10% and 50% of the full load rating of the
converter
module.
19.4
Connect a color-coded, twisted pair (no. 22 or 24 AWG) from the remote
sense pins to the load. The +Sense lead (J4 Pin 11) must go to the posi-
tive side of the load and the - Sense lead (J4 Pin 23) must go to the nega-
tive side of the load.
19.5
Insert one of the converter modules into slot 1 of the rack/shelf (left-
most slot.) Connect the DC power wires to the appropriate source (24 or
48VDC) and measure the voltage across the load at the remote sense
points with a DC digital voltmeter. The voltage should be approximately
the specifi ed
voltage for the module (12, 13.6, 24, 27.2, 48 or 54.4VDC).
19.6 Checking the Front Panel LEDs.
The Input Power Good and Output
Power Good LEDs should both be green.
19.7 Checking the Inhibit Input.
Next, connect a wire going from J4 Pin 1 to
Pin 23. The converter output should turn off, giving zero volts across the
load. The Output Power Good LED should go off. Disconnect the wire.
