Specifications

NetLinx Programming
13
NXA-PDU-1508-8 Power Distribution Unit
Levels
Power (W): Resolution to 0.1W (data scale factor = 10)
Current (A): Resolution to 0.1A (data scale factor = 10)
Voltage (V): Resolution to 0.1V (data scale factor = 10)
Power Factor: W/VA, 2 decimal places (data scale factor = 100).
"Power Factor " is the ratio of real power to apparent power.
Energy (kW-hr): Power over time, resolution to 0.1kW-hr (data scale factor = 10)
Temp (Degrees C or F): Resolution to 0.1C (data scale factor = 10, writing 0 resets counter)
Resetting Level 4 (Accumulated Energy Reading)
The Level 4 value (accumulated energy reading) can be reset to 0 (zero) in three ways:
1. When the PDU is reset or power cycled, Level 4 will go to 0 on all outputs (see Powering Up The NXA-
PDU-1508-8 on page 10).
2. If SEND_LEVEL <PDU dev>,4,0 is sent, Level 4 will go to 0 on that output (if not already at 0).
3. The max value of the level is 65535, if that is exceeded the level will roll over to 0.
Overcurrent Reporting
The PDU reports alerts of overcurrent via the following AxLink string:
OVERCURRENT-<Outlet #>=<Current>
16-bit Level Dev 1 Dev 2 Dev 3 Dev 4 Dev 5 Dev 6 Dev 7 Dev 8
1 Power Power Power Power Power Power Power Power
2 Current Current Current Current Current Current Current Current
3
Power
Factor
Power
Factor
Power
Factor
Power
Factor
Power
Factor
Power
Factor
Power
Factor
Power
Factor
4 Energy Energy Energy Energy Energy Energy Energy Energy
5 Input Voltage Ax Voltage
6 Ax 1 Power Ax 2 Power
7 Ax 1 Current Ax 2 Current
8 Tem p
For power factor, AMX has added an offset of 100 to the value to cope with the
possibility of negative numbers. To obtain the correct value of the power factor, first
subtract 100 from the level returned by the PDU, then divide by 100.
Example:
fPowerFactor1 = (LEVEL.VALUE-100)/100.0 //NB fPowerFactor1 is a FLOAT
variable”
The level range is 0-200.
If reporting overcurrent for the entire unit, the outlet # is specified as 0 (zero).