Limit Violation Alarm - Siemens SICAM P27 Manual

Functions

3.3 Limit violation Alarm

3.3

Limit violation Alarm

1. This product is provided with limit violation alarm function. User may select from voltage, current, power,
power factor and frequency parameters up to 6 data groups at the same time as detection object and set
upper and lower limits and judgment condition for them. Alarm will be activated when measured value is over
the set limit. This product is provided with 2 relay outputs. When alarm parameters are configured that output
is made from certain relay which is at automatic mode (not manual), limit violation alarm signal can be output
through such relay (relay closing).
2. Up to 6 limit violation alarm parameters can be set at the same time within the product. Configuration flow of
each limit violation alarm parameter: select type of detected data-set threshold of detected data-set judgment
condition-select output relay for alarm signal.
• Code of various detected data: (hexadecimal number for Modbus-RTU code)
MODBUS code
00
01
02
03
06
07
08
09
0B
0C
0D
0F
10
11
12
When code of detected data is FF, limit violation alarm function of such group is off.
• Threshold of detected data: threshold judging whether detected value is out of limit; Different units for
different data types: such as voltage-V, current-A, active-KW, reactive power-KVAR, apparent-KVA,
frequency-Hz.
• Judging condition: 0 means alarm activated when exceeding limit; 1 means alarm activated when falling
below limit.
• Alarm signal output relay: 0 means no alarm signal output; 1 means alarm signal outputted from relay 1.
3. Example of alarm parameter setting. Set one limit violation alarm parameter to automatic detection and alarm
for "Phase A voltage", assuming that alarm threshold is 240 V, judging criterion is "over limit) and signal is
outputted from relay 2.
Use MODBUS RTU protocol to set alarm parameter: set 0110 address to "07", 0111 to "0000", 0112 to
"5DC0" (multiply "240" by 100 to generate "24,000" and convert it into "00005DC0"), 0113 to "00" and 0114
to "02".
16
Content of data
Phase A power factor
Phase B power factor
Phase C power factor
Total power factor
Frequency
Phase A voltage
Phase B voltage
Phase C voltage
Uab line voltage
Ubc line voltage
Uca line voltage
Phase A current
Phase B current
Phase C current
Neutral current
MODBUS code
14
15
16
17
18 Phase A reactive power
19 Phase B reactive power
1A Phase C reactive power
1B
1C Phase A apparent power
1D Phase B apparent power
1E Phase C apparent power
1F
SICAM P27, 3-phase Harmonic Power Meter, User Manual
E50417-H8940-C560- , Release Date
Content of data
Phase A active power
Phase B active power
Phase C active power
Total active power
Total reactive power
Total apparent power