User`s manual
RX3i Power Sync and Measurement System 7
GFK-2748
PSM Status Flags
The PSM returns 80 status flag bits to the RX3i controller. Those 80 bits are grouped into five 16-bit words.
The first status word (%I1 – %I16) contains the overall PSM status flags.
The following two words (%I17 – %I48) contain the individual grid measurement faults. These flags identify
the voltage/current channel experiencing a measurement problem. It can be one or multiple problems
related to:
- Input signal not present, that is, it is indicated as not measured in the corresponding %Q flag bit. If the
signal is not measured, it cannot be reconstructed by the PSM module firmware.
- Input signal is measured but it is clamped due to a higher peak voltage/current value than the
maximum value allowed to be applied to the interface unit
The last two status words (%I49 – %I80) contain the individual grid status flags, including the ANSI alarms.
%I Bit Offset
Value
1
PSM HeartBeatBit: Toggled with every scan/sweep
2
PSM ConnectionOK: 1 = OK, 0 = PSM to Terminal Assembly connection failure
3
PSM PhaseShiftOK: 1 = OK, 0 = ANSI 25/1 Alarm
4
PSM DeltaVoltOK: 1 = OK, 0 = ANSI 25/2 Alarm
5
PSM DeltaFreqOK: 1 = OK, 0 = ANSI 25/3 Alarm
6
PSM ANSIFunctions: 0 = OK, 1 = Any Grid, any ANSI Alarm present
7
PSM CloseRelayOK: 1 = OK, 0 = Do not close relay
8
PSM New Data: set when the current PLC sweep is the first sweep this power line cycle data is being
delivered by the PSM to the PLC
9 - 16
Reserved
17
GRID 1 FaultVA: 0 = OK, 1 = Fault - not calculated/measured or clamped
18
GRID 1 FaultIA:
19
GRID 1 FaultVB:
20
GRID 1 FaultIB:
21
GRID 1 FaultVA/VBA; VB/VAC; VC/VBC:
22
GRID 1 FaultIC:
23
GRID 1 FaultIN:
24-32
Reserved
33
GRID 2 FaultVA_VCA: 0 = OK, 1 = Fault - not calculated/measured or clamped
34
GRID 2 FaultIA:
35
GRID 2 FaultVB_VCB:
36
GRID 2 FaultIB:
37
GRID 2 FaultVC:
38
GRID 2 FaultIC:
39
GRID 2 FaultIN:
40 - 48
Reserved
49
GRID 1 ClampedFreq: 0 = OK, 1 = Line Frequency outside the range (40 - 70 Hz)
50
GRID 1 ClampedInput: 0 = OK, 1 = some inputs have signal clamped
51
GRID 1 MixedPolarity: 0 = OK, 1 = At least one phase PT/CT has wrong polarity
52
GRID 1 NegSeqAlarm: 0 = OK, 1 = ANSI 46 Alarm
53
GRID 1 UnderVoltAlarm: 0 = OK, 1 = ANSI 27 Alarm
54
GRID 1 ReversPwrAlarm: 0 = OK, 1 = ANSI 32 Alarm
55
GRID 1 OverCurrAlarm: 0 = OK, 1 = ANSI 50 Alarm
56
GRID 1 OverVoltAlarm: 0 = OK, 1 = ANSI 59 Alarm