Rockwell Automation PDC24 / PAC Chassis Power Supplies - Manual (Page 11)

PDC24 / PAC October 2005 – Issue 3 11
Triguard SC300E PDC24 / PAC Chassis Power Supplies
SERVICING
SCOPE
The PSUs have no field replaceable parts. Faulty units should be returned for repair.
CONFIGURATION
No configurable links.
FIELD FUNCTIONALITY TESTS
The 12V supply is not calibrated. Set up the 5V supply as follows. For each test use a digital
voltmeter across the relevant pair of pins on the 8-way DIN socket.
Output voltage (5V)
Measure across pins 6 and 7. The voltage should be 5.4V ±0.01V.
Output voltage (12V)
Measure across pins 1 and 2. The voltage should be within the range 11.5V to 12.5V.
Output current (5V)
Measure the voltage between pins 1 and 4. This should be proportional to the current supplied
by the PSU at 0.005 Volts per Amp. The current supplied will depend on the configuration of
modules within the system.
SMPS Output voltage (5V)
Measure the voltage between pins 3 and 6. This should not exceed 5.8V. A higher value
(nominally 6.3V) may initiate an overvoltage trip.
Power share line
Measure the voltage between pins 1 and 5. The voltage will depend on the currents being
provided by both power supplies. It should not exceed 4.0V at maximum current.
Power fail interrupt
This can be monitored on pin 8. It is a logic output that is normally pulled up resistively to +5V,
but is pulled low if the ac/dc input supply fails.