NetAlert NetMeter User Manual page 11

Bus Power
Examples of transients
25V
13V
Thresholds:
High Voltage Fault
Low Voltage Warning
Low Voltage Fault
High P-P Voltage Fault
High P-P Voltage Warning
For bus power voltage levels we suggest:
!
Check your power supply for proper installation
and correct output voltage under load.
!
Are your trunk/drop cables too long?
!
Is one or more of your devices drawing too
much current?
For p-p (noise) levels we suggest:
!
Check for output devices (like contactors)
powered from the network (they shouldn't be).
! Check for network cables routed too close to
strong sources of interference
! Check for aging network power supply with
output ripple increasing over time
! If you suspect an intermittent cable or
connector, shake, bend or twist the suspected
cable and/or connector while watching the P-P
measurement for changes (up or down).
25.0V
14.0V
13.0V
10.0V
Bus Power measures
voltage levels on these
two wires (V+ / V-)
4
2.0V
11