Table of Contents
Advertisement
Functions
3.1 Measurements
3.1
Measurements
This product can be used to measure current of each phase, average current and Neutral current.
3.2
Limit violation Alarm
1. This product is provided with Limit violation alarm function. User may select from current 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 1-way
relay output. When alarm parameters are configured that output is made from certain relay which is at auto-
matic mode (not manual), Limit violation alarm signal can be output through such relay (relay closing).
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 judg-
ment condition-select output relay for alarm signal.
• Code of various detected data: (hexadecimal number for Modbus-RTU code)
MODBUS code
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 dif-
ferent types of data, such as current-A.
• Judging condition: 0 means alarm activated when exceeding limit; 1 means alarm activated when falling
below limit.
• Alarm signal output relay: 0 means no output of alarm signal; 1 means alarm signal output from relay.
3. Example of alarm parameter setting. Set one Limit violation alarm parameter to automatic detection and
alarm for "Phase A current", assuming that alarm threshold is 6 A, judging criterion is "over limit" and signal
is outputted from relay 1.
Use MODBUS RTU protocol to set alarm parameter: set 0110 address to "0F", 0111 to "0000", 0112 to "0258"
(multiply "6" by 100 to generate "600" and convert it into "00000258"), 0113 to "00" and 0114 to "01".
12
Content of data
Phase A current
Phase B current
Phase C current
Neutral current
SICAM P20 P21 P22, 3-phase Current Power Meter, User Manual
E50417-H8940-C558-4, Release Date 06.2018
Advertisement
Table of Contents
