TPCMQ DC/DC CONVERTER SERIES
OPERATING MANUAL
21
C O R P O R A T I O N
19.8 Checking the Input Power Fail and Output Power Good Signals.
Mea-
sure the output voltage at both J4 Pins 14 and 15 with respect to -Sense
(Pin 23) with a DC digital voltmeter. Both voltages should be less than
0.5VDC, indicating a logic LO.
19.9 Checking the Remote Adjust Input.
Connect a variable external power
supply as shown in Figure 8. With its output voltage set to zero, check
the output voltage of the converter module with a DC digital voltmeter.
The output voltage should be approximately 25% below its nominal value.
Disconnect the external 5V supply and disconnect the DC input to the
converter rack/shelf.
19.10 Checking the Other Converter Modules.
Each converter module should
be tested in the above manner to verify its operation. Go back to Section
19.5 and proceed through the tests one by one until all converter modules
have been verifi ed.
19.11 Checking the Complete Converter Rack/Shelf.
Confi rm that the output
voltages of the individual converter modules are all set to approximately
their specifi ed output voltages. Insert all three converter modules into
the rack/shelf. Connect a power load to the output–high-power resistor
or electronic load in resistive mode–to give 50% of the maximum output
current for the non-redundant mode of the modules shown in Table 13-1.
Connect the + and - Sense leads to the + and - sides of the load, respec-
tively, as in Section 19.4.
Note that on the back of the rack/shelf each converter module has its own
DC power connection. Connect the rack/shelf inputs to the DC power
source: Shorting bars may be used for a single input correction. Check the
load voltage with a DC digital voltmeter. It should be close to the speci-
fi ed value for the model tested. The Input Power Good and Output Power
Good LEDs should both be green on each converter module.
19.12
While the rack/shelf is operating, pull Module no. 1 out while monitoring
the output voltage with a DC digital voltmeter. It should remain the same.
Insert the module back into the rack/shelf. Repeat this for each of the
other modules. This test determines that hot-swapping is functioning prop-
erly in the N+1 redundant mode.
19.13
With all the modules inserted into the rack/shelf, check the Inhibit input for
the entire system. Connect a wire from J4 Pin 1 to Pin 23. The system
output should turn off, and the output voltage should go to zero. Recon-
nect the wire. This completes the rack/shelf setup and testing. Disconnect
the DC power source.
