© National Instruments | 2-13
RMX Programmable Power Supplies User Manual
Clearing Alarms
To clear alarms, (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 the RMX programmable power supply off, fix the problem
that caused the alarm, and then turn the RMX programmable power supply on.
If overvoltage protection 2 (OVP2), overheat protection 2 (OHP2) or Shutdown (SD) has been
activated, turn the RMX programmable power supply off, fix the problem that caused the alarm,
and then turn the RMX programmable power supply on.
When the overheat protection (OHP), fan failure protection (FAN), or low AC input protection
(AC-FAIL) function is activated, the output is turned off. You can use the CONFIG settings to
select how the RMX programmable power supply will perform after the problem that caused the
alarm is fixed. You can select to turn the output back on automatically after the problem that
caused the alarm is fixed (CF03: Auto) or to leave the output off (CF03:SAFE).
If an alarm still occurs even after you have corrected all the causes of alarms, the RMX
programmable power supply may be malfunctioning. Stop using it immediately, and contact
National Instruments. For details about the specific conditions that cause each alarm to trigger,
see the explanation of each protection function.
Alarm Signal
The alarm signal is isolated from other terminals as it is through an open collector photocoupler.
Maximum voltage is 30 V and maximum current is 8 mA.
Figure 2-15. Alarm Signal
3
6-9
J2 connector
ALM STATUS
STATUS COM
RMX
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