Functions
3.8 Limit violation Alarm
SICAM P38 P39, 3-phase Power Meter with Multi-Tariff function, User Manual
E50417-H8940-C564-4, Release Date 06.2018
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3.8 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 at most 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.
2. At most 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)
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 limit violation; 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;
2 means alarm signal outputted from relay 2; 3 means alarm signal outputted from relay 1 and relay 2 at
the same time.
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".
MODBUS code Content of data MODBUS code Content of data
00 Phase A power factor 14 Phase A active power
01 Phase B power factor 15 Phase B active power
02 Phase C power factor 16 Phase C active power
03 Total power factor 17 Total active power
06 Frequency 18 Phase A reactive power
07 Phase A voltage 19 Phase B reactive power
08 Phase B voltage 1A Phase C reactive power
09 Phase C voltage 1B Total reactive power
0B Uab line voltage 1C Phase A apparent power
0C Ubc line voltage 1D Phase B apparent power
0D Uca line voltage 1E Phase C apparent power
0F Phase A current 1F Total phase apparent power
10 Phase B current 20 Active demand
11 Phase C current 21 Reactive demand
12 Neutral current 22 Apparent demand
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