AAON SA-023, Installation Operation & Maintenance

Page: 51 / 64

51
Phase and Brownout Protection Module
The DPM is a Digital Phase Monitor that
monitors line voltages from 200VAC to
240VAC 1
ɸ
and 200VAC to 600VAC 3
ɸ
.
The DPM is 50/60 Hz self-sensing. DPM
should be wired according to unit specific
wiring diagram include in the control
compartment
When the DPM is connected to the line
voltage, it will monitor the line and if
everything is within the setup parameters,
the output contacts will be activated. If the
line voltages fall outside the setup
parameters, the output relay will be de-
energized after the trip delay.
Once the line voltages recover, the DPM
will re-energize the output relay after the
restart time delay. All settings and the last 4
faults are retained, even if there is a
complete loss of power.
DPM Setup Procedure
With the supply voltage active to the
module, you can setup all of the DPM’s
settings without the line voltage connected.
To change the setpoint parameters use the
right arrow key to advance forward through
the setpoint parameters and the left arrow to
backup if needed. When each parameter is
displayed use the up/down keys to change
and set the parameter.
After adjustments are made or if no
adjustments are made it will take 2 to 4
minutes before the DPM energizes the
output relay unless there is an out of
tolerance issue with the incoming line
voltage.
Recommended Default Set-up
Line Voltage 460VAC, 3Ø
Over & Undervoltage ±10%
Trip Time Delay 5 Seconds
Re-Start Time Delay 2 Minutes
Phase Imbalance 5%