4-10 | ni.comChapter 4 Parallel/Series OperationAlarmAll the alarms that are detected on a single unit are also detected during series operation.You can use the CONFIG settings to specify what happens when the output is turned off becausean alarm is detected. You can select to turn the output on automatically when the problem thatcaused the alarm is fixed (CF03: Auto) or to leave the output turned off when the problem isfixed (CF03: SAFE).Clearing AlarmsTo clear alarms, (1) press ALM CLR (SHIFT+SET); (2) set pin 5 of the J1 connector to LOW(0 to 0.5 V) or shorted; or (3) turn off unit 1 and unit 2, fix the problem that caused the alarm,and then turn on unit 1 and unit 2.Connection (Series Operation)You can connect up to two units.Caution Risk of electric shock. Turn the POWER switch off before you touch theOUTPUT terminals. Attach the OUTPUT terminal cover after you finish wiring theload.When the load cables are distributed over longer distance, the phase shifting due towiring inductance and capacitance may go beyond the limit and result in oscillation.To prevent such oscillation, connect an electrolytic capacitor with several hundredsto several tens of thousands μF across the load. Use an electrolytic capacitor with awithstand voltage that is 120% or more of the total of the rated output voltages of theRMX programmable power supplies that are connected in series.Connecting the Load (Series Operation)Figure 4-6. Load Connection in Series OperationLoad or relayterminal blockUnit 1Unit 2Output terminalChassis terminalOutput terminalChassis terminal
