Local Operation 
 
3-38  M370430-01  Rev B 
Power On Status Signal 
Power On Status signal indicates a fault condition in the power supply. 
Power On Status signal is a TTL output signal at Pin J2.13 with 
reference to COM ISOLATED (Pin J2.2 or Pin J2.6). 
During normal operation, the Power On Status signal will be high. If the 
output is disabled for any reason, the Power On Status signal will go 
low. 
The following conditions will set the Power On Status to a low level: 
  AC fail 
  Current Loop Protection 
  Over Voltage Protection (OVP) 
  Under Voltage Protection (UVP) 
  Over Current Protection (OCP)  
  Over Temperature Protection (OTP) 
  Foldback Protection 
  Interlock 
  Output Off 
  Shutdown activated (rear panel shutdown). 
  Internal hardware malfunction Fan failure 
 
Hardware Malfunction Alarms 
The power supply will turn off the output. An error message will be 
displayed in the event that: 
  OVP trips 
  Voltage deviation in CV mode reaches more than ±5% from the set 
level.
1
 
  Current deviation in CC mode reaches more than ±5% from the set 
level.
1
 
 
 
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1. These two forms of hardware malfunction are only monitored in the 
corresponding APG mode.