Siemens SICAM P20 User manual

SICAM P20
SICAM P21
SICAM P22
3-phase Current Power
Meter
V1.40
Manual
E50417-H8940-C558-4
Preface
Content
Overview 1
Technical Data 2
Functions 3
Operation and Display 4
Installation and Wiring 5
Communication 6
Maintenance 7
Ordering Number 8

Siemens Power Automation Ltd. Order No.: E50417-H8940-C558-4
NOTE
For your own safety, observe the warnings and safety instructions contained in this document, if available.
Disclaimer of Liability
This document has been subjected to rigorous technical review
before being published. It is revised at regular intervals, and any
modifications and amendments are included in the subsequent
issues. The content of this document has been compiled for
information purposes only. Although Siemens AG has made best
efforts to keep the document as precise and up-to-date as possible,
Siemens AG shall not assume any liability for defects and damage
which result through use of the information contained herein.
This content does not form part of a contract or of business
relations; nor does it change these. All obligations of Siemens AG
are stated in the relevant contractual agreements.
Siemens AG reserves the right to revise this document from time to
time.
Document Version: V01.10.01
Release date: 06.2018
Copyright
Copyright © Siemens AG 2015. All rights reserved.
The disclosure, duplication, distribution and editing of this docu-
ment, or utilization and communication of the content are not per-
mitted, unless authorized in writing. All rights, including rights
created by patent grant or registration of a utility model or a design,
are reserved.
Registered Trademarks
SIPROTEC®, DIGSI®, SIGUARD®, SIMEAS®, and SICAM® are
registered trademarks of Siemens AG. Any unauthorized use is
illegal. All other designations in this document can be trademarks
whose use by third parties for their own purposes can infringe the
rights of the owner.

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Preface
Purpose of this manual
This manual describes the functions, operation, installation, and commissioning of devices 3-phase Current
Power Meter-> In particular, one will find:
• Information regarding the configuration of the scope of the device and a description of the device functions
> Chapter 3;
• Instructions for Operation and Display > Chapter 4;
• Technical Data > Chapter 2;
Target Audience
Protection engineers, commissioning engineers, personnel concerned with adjustment, checking, and service
of selective protective equipment, automatic and control facilities, and personnel of electrical facilities and
power plants.
Additional Support
Should further information on the System SICAM be desired or should particular problems arise which are not
covered sufficiently for the purchaser's purpose, the matter should be referred to the local Siemens represen-
tative.
Our Customer Support Center provides a 24-hour service.
Phone: [phone]
Fax: [phone]
E-mail: [email protected]
Notes on Safety
This document is not a complete index of all safety measures required for operation of the equipment
(module or device). However, it comprises important information that must be followed for personal safety, as
well as to avoid material damage. Information is highlighted and illustrated as follows according to the degree
of danger:
DANGER
DANGER means that death or severe injury will result if the measures specified are not taken.
✧Comply with all instructions, in order to avoid death or severe injuries.
WARNING
WARNING means that death or severe injury may result if the measures specified are not taken.
✧Comply with all instructions, in order to avoid death or severe injuries.

Preface
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CAUTION
CAUTION means that medium-severe or slight injuries can occur if the specified measures are not taken.
✧Comply with all instructions, in order to avoid moderate or minor injuries.
NOTICE
NOTICE means that property damage can result if the measures specified are not taken.
✧Comply with all instructions, in order to avoid property damage.
NOTE
Important information about the product, product handling or a certain section of the documentation which
must be given particular attention.
Qualified Electrical Engineering Personnel
Only qualified electrical engineering personnel may commission and operate the equipment (module, device)
described in this document. Qualified electrical engineering personnel in the sense of this manual are people
who can demonstrate technical qualifications as electrical technicians. These persons may commission,
isolate, ground and label devices, systems and circuits according to the standards of safety engineering.
Proper Use
The equipment (device, module) may be used only for such applications as set out in the catalogs and the
technical description, and only in combination with third-party equipment recommended and approved by
Siemens.
Problem-free and safe operation of the product depends on the following:
• Proper transport
• Proper storage, setup and installation
• Proper operation and maintenance
When electrical equipment is operated, hazardous voltages are inevitably present in certain parts. If proper
action is not taken, death, severe injury or property damage can result:
• The equipment must be grounded at the grounding terminal before any connections are made.
• All circuit components connected to the power supply may be subject to dangerous voltage.
• Hazardous voltages may be present in equipment even after the supply voltage has been disconnected
(capacitors can still be charged).
• Operation of equipment with exposed current-transformer circuits is prohibited. Before disconnecting the
equipment, ensure that the current-transformer circuits are short-circuited.
• The limiting values stated in the document must not be exceeded. This must also be considered during
testing and commissioning.
■

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Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.1 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
3 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
3.1 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2 Limit violation Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.3 Display and Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.4 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.5 Permission and Security Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.6 Digital Input and Output Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4 Operation and Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.1 Full-screen Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Cyclic Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.3 Key Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
5 Installation and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
5.1 Overall Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.2 Precautions of Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
5.3 Terminals and Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6 Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
6.1 Use of Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
6.2 Introduction of MODBUS-RTU Communication Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
6.2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
6.2.2 Function of Application Layer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
6.2.3 CRC Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
6.2.4 Information mapping table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
7.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
8 Ordering Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
8.1 Ordering Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Contents
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Overview 1
1.1 Introduction 8
1.2 Features 8

Overview
1.1 Introduction
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1.1 Introduction
SICAM P20, P21 and P22 3-phase electronic current monitoring instruments are designed for measuring 3-
phase current of power grid. LCD screen is used. Data acquisition through RS485 is available. RS485
communication supports MODBUS-RTU protocol.
This product is extensively applicable to power substation and distribution automation system, industrial control
and industrial automation system, energy management system and community power monitoring, etc.
This 3-phase electronic multi-function power meter meets following standards:
• IEC 62052-11:2003 (Electricity metering equipment (a.c.) General requirements, tests and test conditions-
Part 11: Metering equipment) standard
• Modbus-RTU
1.2 Features
This project uses high-precision sampling and metering unit and high-speed MCU data processing unit, sup-
porting high-precision, wide-range and accurate measurement and quick data analysis; segmented multi-line
WVA LCD, realizing various and abundant display; white backlight for LCD, satisfying the need for viewing data
in dark environment; NVRAM, supporting long-time data storage without data loss even in the event of power
failure; RS485 communication port and industrial standard communication protocols, realizing flexible and re-
liable communication.
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Technical Data 2
2.1 Technical Data 10

Technical Data
2.1 Technical Data
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2.1 Technical Data
■
Item Technical Data
Product standard IEC61557-12:2007
Input connection 3 phase, single phase
Measurement Current
Rated current In: 1 A, 5 A
Measuring range: 0.015 A ... 6 A
Maximum measuring range: 9 A
Power consumption: < 0.3VA (single phase @5A)
Accuracy: RMS 0.2 %
Resolution: 0.001 A
Digital signal
Binary output (optional)
1 electromagnetic relay output
Normal Open Contact
Contact capacity: AC 250 V /3 A, DC 30 V /3 A
Binary input (optional)
2 dry contact inputs
Opto-coupler isolation, 4,000 VRMS
Communication RS-485 port
Interface type: Twisted Pair, Half Duplex Transmission
Communication rate: 600 bps ... 38,400 bps
Protocol: Modbus-RTU
Environment
Operating temp. -25 ℃... +60 ℃
Operating temp. limit -35 ℃... +70 ℃
Relative humidity ≤95 % (condensation free)
Others
Operating power
supply
AC or DC power supply
Max. input range: 40 V ... 420 V
Power consumption: ≤1.5 W, 2.5 VA
Dimension
Overall dimension (mm): 72×72×85
Panel cut out size (mm): 67×67
IP53
Weight Approx. 300 g

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Functions 3
3.1 Measurements 12
3.2 Limit violation Alarm 12
3.3 Display and Buttons 13
3.4 Communication 13
3.5 Permission and Security Management 13
3.6 Digital Input and Output Interface 14

Functions
3.1 Measurements
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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)
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".
MODBUS code Content of data
0F Phase A current
10 Phase B current
11 Phase C current
12 Neutral current

Functions
3.3 Display and Buttons
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3.3 Display and Buttons
This product uses large-screen WVA multi-line LCD to provide visual and various display. The screen is pro-
vided with white backlight, enabling clear display in dark environment. Specific data information can be ob-
tained through display with button operation. For details, see Chapter Operation and Display.
3.4 Communication
RS485 port is provided for parameter setting and reading of various data. For specific description, see Chapter
Communication.
3.5 Permission and Security Management
1. This product is provided with programming permission management function.
• L0 password: used for meter reset, setting all parameters and modifying L0, L2 and L4 passwords;
• L2 password: used for meter reset, setting all parameters and modifying L2 and L4 passwords;
• L4 password: used for parameter setting and modifying L4 password, not for meter reset, clearing extreme
values and PT/CT ratio setting.
• All level default PASSWORD is "000000"
2. Parameter setting is available only when this product is in programmable state. Steps for entering
programming state: press " " and " " at the same time to enter "PASS" screen; input correct
password and press " " to enter "SET" screen and enable programmable state. After entering
programmable state, programmable state prompt appears on the bottom right corner of LCD. Programmable
state will remain valid in 10 minutes after program button is pressed and become invalid after power down.
3. If incorrect password is used to set this product continuously (including communication setting and button
programming) up to specific number of times (factory default 5 times), parameter setting function will be
locked (factory default 60 minutes). Error count will be reset after setting once using correct password if such
count is less than specific limit. Error count of password and lock time can be set (available in factory state).

Functions
3.6 Digital Input and Output Interface
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3.6 Digital Input and Output Interface
Binary Input Interface
This product is provided with 2-digit binary inputs interface based on passive dry contact. Terminals are identi-
fied as DI1, DI2 and COM. COM is the common terminal.
Figure 3-1 Circuit Diagram of Binary Input Interface
Relay Output Interface
This product is provided with one relay output interfaces for alarm indication or protection control output in many
conditions. Electric parameter of internal relay: AC 250 V/DC30 V, 3 A.
Figure 3-2 Circuit Diagram of Relay Output Interface
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Operation and Display 4
4.1 Full-screen Display 16
4.2 Cyclic Display 16
4.3 Key Definition 17

Operation and Display
4.1 Full-screen Display
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4.1 Full-screen Display
Figure 4-1 Description of LCD Indication
4.2 Cyclic Display
Key Functions at Cyclic Display Mode
Screen Lock in Cyclic Display State
Data in display area A or B can be locked in cyclic display state to enable long-time monitoring of data in certain
area.
Steps: press " ", select the desired display area (target data will blink thrice), and press " " to lock, and
vice versa for unlocking.
Cyclic Display Parameter
Duration: 1 to 99 sec., configurable;
Number of items: to be defined with one byte. 4 high 4 bits are number of items in display area A while 4 low 4
bits are number of items in display area B. 16 items are acceptable to each area. At any time, display area A
and display area B should have at least one cyclic display item.
Cyclic Display State
Cyclic display data in areas A and B can be defined by user. User may develop cyclic display scheme previously
through inquiring "Code list of optional settings in areas A and B".
Code list of optional settings in area A:
Key symbol ▲▼
Function Switching from cyclic display to
buttom display
Lock/unlock blinking
display
Switching between display
areas A and B (blinking
prompt)
Data item Data type (current value)
Transient Maximun Minimum
Current 6 7 8
Neutral current 9 10 11

Operation and Display
4.3 Key Definition
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Note
In flip-with-key state or parameter-set-with-key state, this product will automatically return to cyclic display state
if no key operation within defined duration.
4.3 Key Definition
Key Functions at Flip-With-Key Display Mode
Data Item of Key Display
Examples for Flip-With-Key Operation
Key symbol ▲▼
Function
1) Switch from cyclic display state
to key display state through press-
ing "▲" or "▼".
2) Flip over to previous screen with
"▲" and to next screen with "▼".
Enter next menu
1) Switch between A (multi-
line) and B (single line) display
areas
2) Return to previous menu
No. Display content (1st level) Display content (2nd level)
1 Current Extreme value
2 Neutral current Extreme value
3CTratio /
4 Version /
5 Device ID /
6 Error code /
Example 1:
This screen shows current items.
At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to current items. In the
figure, L1=1.000 A, L2=1.001 A, L3=1.002 A and 3-phase
average current=1.001 A.
"RS1" shows there is one RS485 port and flickering symbol
means communication in progress.
Example 2:
This screen shows null line current items.
At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to null line current
items.
In the figure, L1=0.940 A, L2=1.003 A, L3=1.006 A and null
line current=0.079 A.

Operation and Display
4.3 Key Definition
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Example 3:
This screen shows maximum value display items of phase
current.
At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to phase current
display items. Press " " to enter maximum value display.
In the figure, L1=1.020A, L2=1.031A, L3=1.032A and
maximum value of average phase current =1.027A. Press "▲"
or "▼" to switch to minimum value display of phase current
and press " " to return to previous display.
Example 4:
This screen shows CT ratio display items.
At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to CT ratio display
items.
In the figure, CT ratio=5.
(Note: decimals part of ratio are not displayed.)
Example 5:
This screen shows display items of software version number.
At cyclic display mode, press " ▲" or " ▼" to enter key
display mode. Press " ▲" or " ▼" again to switch to display
items of software version number. In the figure, "Soft" means
software version, "13" means product specification, "121121"
means software version date and "00" means serial number of
software production.
Example 6:
This screen shows Device ID display items.
At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to Device ID display
items. Device ID=000000000001.
Example 7:
This screen shows error code display items.
At cyclic display mode, press "▲" or "▼" to enter key display
mode. Press "▲" or "▼" again to switch to error code display
items. "E" means error prompt, the 3 bits from right to left
mean respectively phase C reverse, phase B reverse, and
phase A reverse. Other 4 bits are meaningless. For example,
"E0000001" means phase C reverse error occurs.

Operation and Display
4.3 Key Definition
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Key Setting Parameters
1. Key functions at parameter setting mode
2. Data items configurable with key
Key symbol ▲▼
Function a) "▲" to switch digit or flip over;
b) "▼" to move cursor or flip over.
Enter next menu
a) Press " " and " " at the same time to enter
setting screen.
b) Press " " to enter next menu or "confirm" parameter
setting.
c) Press " " to return to previous menu or "cancel" pa-
rameter setting 1.
1.Press " " once after adjusting parameters with "▲" and "▼" to display "Sure", and press " " once
again to alter parameters. Pressing " " immediately after "Sure" appears will cancel current alteration.
NO. 1st level menu 2nd level menu
Symbol Definition Symbol Definition Range Remarks
1Communi-
cation
setting
Baud rate 600 ... 38400 Default setting:
2400
Parity 8E1/8o1/8n1/8n
2Default setting: 8E1
Modbus address 0 ... 247 Default setting: 0
Modbus sending
delay 0 ... 2999 Default setting: 10
DL/T645 high 6
address 0 ... 999999 Default setting: 0
DL/T645 low 6
address 0 ... 999999 Default setting: Last 3 digital of S/N
2Ratio
setting
Current conversion
ratio integer part 0 ... 9999 Combination 0 ...
9999.9999
Current conversion
ratio decimal part 0 ... 9999 Default setting: 1
3System
setting
Connection
3P4L
3P3L_2CT
3P3L_3CT
AUto
3phase4wire
3phase3wire -2CT
3phase3wire -3CT
Automatic
Password
6 bits in total, alter-
ing L0-2 password
Default setting:
000000

Operation and Display
4.3 Key Definition
SICAM P20 P21 P22, 3-phase Current Power Meter, User Manual
E50417-H8940-C558-4, Release Date 06.2018
20
Note
Password level (1 bit, 0 to 2) and password (6 bits) should be entered at first for key setting. Password level
and permission:
• L0 password-all parameters above are configurable;
• L1 password-all parameters above are configurable;
• L2 password-all parameters except for meter reset, clearing extreme value and PT/CT ratio are
configurable. All default password is 000000.
Note
The meter should be reset after altering conversion ratio to ensure reasonable correspondence between
communication reading and displayed metering data.
4
Clearing
extreme
value
Meter reset
5Display
setting
Time of returning to
cyclic display state
when no operation
1 ... 99
Unit: min.
Default setting: 10
Time of backlight
on when no opera-
tion (normally on
when set to 0)
0 ... 99
Unit: min.
Default setting: 10
Interval of cyclic
display 1 ... 99
Unit: sec
Default setting: 5
NO. 1st level menu 2nd level menu
Symbol Definition Symbol Definition Range Remarks