GE PACSystems RX3i User Manual page 7

RX3i Power Sync and Measurement System
%Q Bit
Offset
Relay Close: Works with bit 16 to control the Sync Relay operation.
32
For more information, refer to Relay Open/Relay Close Operation in GFK-2749.
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
Definition
Offset
1 PSM HeartBeatBit:
2 PSM ConnectionOK:
3 PSM PhaseShiftOK:
4 PSM DeltaVoltOK:
5 PSM DeltaFreqOK:
6 PSM AllGridAlarmsOK
7 PSM RelayCloseOK:
8 PSM New Data
9 - 16 Reserved
2
Alarm availability: A checkmark indicates whether an alarm is available for use in either the 1-Phase (1ø) or the 3-Phase
(3ø) Grid Operational Mode (refer to Mode Control Bits Sent to PSM Module in GFK-2749). All alarms are available in 3-Phase
mode. An absent checkmark indicates that the value of the bit is indeterminate and the bit should be ignored.
Function
Value
Toggled with every scan/sweep
1 = OK
0 = PSM to Terminal Assembly
connection failure
1 = OK
0 = ANSI 25/1 Alarm
1 = OK
0 = ANSI 25/2 Alarm
1 = OK
0 = ANSI 25/3 Alarm
1 = OK
0 = At least one alarm on either
grid is set
1 = OK
0 = Do not close relay
1 = The current PLC sweep is the
first sweep this power line
cycle data is being delivered
by the PSM to the PLC.
0 = Data has not changed from
previous sweep.
Status/Alarm Alarm
Timing Availability
A, B, AB: Refer to
the section,
ø
1
Status/Alarm
Timing
Updated every ü
scan
A ü
A
A
A
AB
A
A ü
7
GFK-2748C
2
ø
3
ü
ü
ü
ü
ü
ü
ü
ü