User's Manual
56 Meter Operation
Disconnect Switch Error Event Argument Formats
The Disconnect Switch Error event has several different arguments that contain
information about why the event was logged and the state of the meter at that time.
In summary, an argument value of 0x0054 or 0x005C means that load side
generation was detected, and any other argument is indicative of an unexpected fault
related to the load disconnect contactor. Below is more detail on the argument
encoding.
Note: Your meter may be configured to use the Load Side Voltage Detected error to
indicate when load side voltage is present, in which case all arguments
relevant to load side voltage as described below are unused.
The argument type is identified by the lowest 3 bits of the argument itself.
Argument Format 2:
If Bits [2..0] are binary xx1 (where x can be either 0 or 1), then bits 1..3 represent the
current status of the load disconnect contactor and the remaining bits are reserved
for internal use. This argument is included every time the Disconnect Switch Error
event is logged:
Bits1..2: Internal State
o
1 = closed
o
2 = opened
o
3 = locked open
Bit 3: External State
o
0 = open
o
1 = closed
Argument Format 3:
If Bits [2..0] are set to binary x10, then it is a new occurrence of the condition. The
rest of the argument information is reserved for internal use, but the Disconnect
Switch Error event with argument format 2 will also be logged in this case and
should provide some information as to the current state of the load disconnect
contactor.
Argument Format 4:
If Bits [2..0] are set to 4 (binary 100), then the event has been logged because the
disconnect feedback is unreliable or because the meter has detected load side
generation when the disconnect is open. In this case, bits 3-6 indicate the following
status, and the remaining bits are reserved for internal use.
Bits 3..4: Internal State
o
1 = closed
o
2 = opened
o
3 = locked open
Bit 5: External State
o
0 = open (NES version 3.1 meter) or not applicable
(NES version 3.0 meter)
o
1 = closed