GE PQM II, Инструкция по эксплуатации

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5–16 PQMII POWER QUALITY METER – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
• TRACE MEMORY TRIGGER MODE : The trace memory can be configured to trigger in
two different modes as described in the table below.
• Ia/Ib/Ic/In OVERCURRENT TRIG LEVEL : Once the phase A/B/C/neutral current equals
or increases above this setpoint value, the trace memory is triggered and data on all
inputs are captured in the buffer. The number of cycles captured depends on the value
specified in the
TRACE MEMORY USAGE
setpoint.
• Va/Vb/Vc OVERVOLTAGE TRIG LEVEL : Once the phase A/B/C voltage equals or
increases above this setpoint value, the trace memory is triggered and data on all
inputs are captured in the buffer. The number of cycles captured depends on the value
specified in the
TRACE MEMORY USAGE
setpoint. Phase to neutral levels are used
regardless of the VT wiring.
• Va/Vb/Vc UNDERVOLTAGE TRIG LEVEL : Once the phase A/B/C voltage is equal to or
less than this setpoint value, the trace memory is triggered and data on all inputs are
captured in the buffer. The number of cycles captured depends on the value specified
in the
TRACE MEMORY USAGE
setpoint.
• SWITCH INPUT A(D) TRIG : If the setpoint is set to “Open-to-Closed”, the trace memory
is triggered and data on all inputs are captured in the buffer on a Switch A(D) close
transition. If the setpoint is set to “Closed-to-Open”, the trace memory is triggered and
data on all inputs are captured in the buffer on a Switch A(D) open transition. The
number of cycles captured depends on the value specified in the
TRACE MEMORY USAGE
setpoint.
• TRACE MEMORY TRIGGER DELAY : In some applications it may be necessary to delay
the trigger point to observe the data before the fault occurred. The PQMII allows the
trigger to be delayed by the amount of cycles set in this setpoint. Therefore, buffer will
always contain the number cycles specified in this setpoint before the trigger point
and the remaining space in the buffer is filled with the cycles after the trigger point.
• TRACE MEMORY TRIGGER RELAY : The relay selected here will be activated upon the
occurrence of a Trace Memory Trigger. This relay will be cleared once the Trace
Memory is re-armed.
See 7.4 Triggered Trace Memory for additional details on this feature.
Setpoint Value Result
1 x 36 cycles Upon a trigger, the entire buffer is filled with 36 cycles of data.
2 x 18 cycles
The buffer is split into 2 separate buffers and upon a trigger, the
first buffer is filled with 18 cycles of data and upon a second
trigger, the second buffer is filled with 18 cycles of data.
3 x 12 cycles
The buffer is split into 3 separate buffers and upon a trigger, the
first buffer is filled with 12 cycles of data, upon a second trigger,
the second buffer is filled with 12 cycles of data and upon a
third trigger, the third buffer is filled with 12 cycles of data.
Setpoint Value Result
One Shot
The trace memory will be triggered once per buffer as defined
in the TRACE MEMORY USAGE setpoint above. In order for it to
re-trigger, it must be re-armed through the serial port using the
EnerVista PQMII Setup Software or other software. Once re-
armed the trace memory will default back to the first buffer.
Retrigger
The trace memory will automatically re-trigger upon each
condition and overwrite the previous buffer data.