Acrel AMC Series Owner's manual

351
AMC Series programmable intelligent meters
Installation and Operation Instruction V2.1
ACREL CO.,LTD

DECLARATION
No part of this publication may be reproduced, stored in a retrieval System, or transmitted in any
form by any means, electronic, mechanical photocopying , recording, or otherwise without prior
permission of Acrel.
All rights reserved.
This company reserve power of revision of product specification described in this manual,
without notice. Before ordering, please consult local agent for the new specification of product.

Contents
1.General............................................................................................................................................................................ 3
2.Type Description............................................................................................................................................................. 3
3 Technical parameter.........................................................................................................................................................4
4 Installing and wiring........................................................................................................................................................5
4.1 Outline and mounting cut out size (Unit: mm).................................................................................................... 5
4.2 Diagram of meter and its cut out..........................................................................................................................5
4.3 Installing...............................................................................................................................................................5
4.4 Terminals and wiring........................................................................................................................................... 6
4.5 Notice................................................................................................................................................................... 9
5 Operating description.................................................................................................................................................... 10
5.1 Key function description.................................................................................................................................... 10
5.2 Programming menu............................................................................................................................................10
5.3 Setting and use................................................................................................................................................... 12
5.4 View switching display and alarm status........................................................................................................... 22
6 Communication............................................................................................................................................................. 23
6.1 General............................................................................................................................................................... 23
6.2 Protocol.............................................................................................................................................................. 23
6.3 Method to create error check code (CRC)......................................................................................................... 24
6.4 Communication parameter address meter (word)..............................................................................................25
6.5 Communication application............................................................................................................................... 26
7 Common fault analysis..................................................................................................................................................28

1.General
AMC series programmable intelligent meters, adopting AC sampling technology, can directly or indirectly
measure electric voltage and current of single phase or three phase grid. It can be used for local display, and connecting
industrial control device to form measuring control system。
This series of meters have RS-485 port, adopt Modbus-RTU protocol. Analog output, alarm output, switching
input/ output can be selected. Based on different request, by pressing the keys, parameters of ratio, alarm,
communication etc. can be modified.
2.Type Description
Table 1
Type
Basic function
Shape
Optional function
AMC48-AI
AMC48-AV
Current, voltage measurement
LED
48
Square
1. RS485 communication (/C )
2. Analog output (/M )
AMC48-AI3
AMC48-AV3
None
AMC48L-AI
AMC48L-AV
Current, voltage measurement
LCD
1. RS485 communication (/C )
2. Analog output (/M )
AMC48L-AI3
AMC48L-AV3
None
AMC72-AI
AMC72-AV
AMC72-AI3
AMC72-AV3
Current, voltage measurement
LED
72
Square
1. RS485 communication ( / C )
2. Analog output (/M )
3. Alarm output (/J)
4. Analog output + RS485 communication (/ MC )
5. RS485 communication + switching output 2DI2DO (/KC )
6. Alarm output + analog output + RS485 communication
(/JMC )
AMC72-DI
AMC72-DV
DC voltage, current measurement
LED
AMC72L-AI
AMC72L-AV
AMC72L-AI3
AMC72L-AV3
Current, voltage measurement
LCD
AMC72L-DI
AMC72L-DV
DC voltage, current measurement
LCD
AMC96-AI
AMC96-AV
AMC96-AI3
AMC96-AV3
Current, voltage measurement
LED
96
Square
1. RS485 communication (/C )
2. Analog output (/M or /3M )
3. Alarm output (/J)
4. Analog output + RS485 communication (/ MC or /M3C )
5. RS485 communication + switching 4DI2DO (/KC )
6. Alarm output+ analog output + RS485 communication (/JMC )
AMC96L-AI
AMC96L-AV
AMC96L-AI3
AMC96L-AV3
Current, voltage measurement
LCD
Notes:
1. AI/AV means single-phase current/voltage, AI3/AV3 means three-phase current/voltage;
2. /J means 1 channel relay output (multiplexing with second channel switching output).

3 Technical parameter
Table 2
Technical parameter
Value
Input
Rated value
AC voltage：Single phase AC 100V ,400V
Three phase AC 100V ,400V , 660V（UL-L, Only 72/ 96）
AC current：AC 1A,5A
DC voltage：1000V ,300V ,75mV ,10V
DC current：0-20mA ,4-20mA ,5A；
Overload
Voltage: 1.2 times rated value(continuous); 2 times rated value /1 second
Current: 1.2 times rated value(continuous); 10 times rated value /1 second
Frequency
45Hz～65Hz
Power
consumption
Power consumption of each voltage, current input circuit is less than 0.5VA
Accuracy
0.5 class
Function
Display
LED or LCD
Communication
RS485, Modbus-RTU protocol；（1 start bit, 8 data bit, 1 stop bit, no parity）
Baud Rate 2400/4800/9600/19200 bps etc.
Alarm
1 channel passive relay，contact capacity 3A/30VDC，3A/250VAC，
Used for high,low, unbalance alarm etc.
Analog
DC4~20mA, ( load < 500Ω)
(note：Shielded wire is specially selected for the above signal input and output)
switching
Input
4 channel or 2 channel dry contact Input, built in power supply
Output
2 channel switching output, NO relay contact, capacity: 3A/30VDC，3A/250VAC
Auxiliary
supply
Voltage range
AC/DC 85-265V
Power
consumption
< 5VA
Insulation resistance
≥ 100MΩ
Power frequency withstand
voltage
Between power supply set of terminals and signal input, output set of terminals 2kV/1min (RMS)
Between the shell and all set of terminals
（except the set of terminals reference voltage less than 40V）
AC 4kV
Enviro
nment
Temperature
Operation： -10℃～+55℃ Storage: -25°C ~+70°C
Humidity
≤95%RH, no condensation, without corrosive gas
Altitude
≤ 2500m

4 Installing and wiring
4.1 Outline and mounting cut out size (Unit: mm)
Table 3
4.2 Diagram of meter and its cut out
4.3 Installing
1) Make holes on distribution cabinets;
2) Take out the meter and the buckle;
3) The meter is loaded into the mounting hole from the front, as shown in Figure 4;
4) Insert the buckle and fix the meter, as shown in Figure 5.
图 4 图 5
Shape
Panel
Housing
Cut out
Unit：mm
Width
Height
Width
Height
Depth
Width
Height
48 Square
49
49
44
44
93
45
45
72 Square
75
75
66.5
66.5
94.3
67
67
96 Square
96
96
90
90
77.8
92
92

4.4 Terminals and wiring
According to different design requirements, it is recommended to add a fuse (BS88 1A gG) to the power supply
and voltage input terminals to meet the safety requirements of relevant electrical codes.
4.4.1 Terminals and wiring
Analog wiring:
50 59
AO+ AO-
50 51 52 59
AO1COM5
AO2AO3
Analog Output
Switching input wiring:
30 31 32 33 39
COM1DI4
DI3DI2
DI1
30 31 39
COM1
DI2
DI1
Switching Input
Switching output or alarm wiring:
Switching Output
40 41 42 43
- + -
DO1 DO2
+
Alarm Output
42 43
J

RS-485 wiring:
RS485
21 22
AB
Power wiring：
L N
FUSE
Auxiliary Power
L
N
1 2
Voltage or current wiring:
Single phase:
L
N
I1
*I1
Current input
S1 S2
*
*
4 5
L
N
U1UN
FUSE
11 14
Voltage input
L
N
U1UN
11 14

Three phase:
Three phase voltage：
A
B
C
UAUBUCUN
FUSES
3-phase 3-wire
A
B
C
N
UAUBUCUN
FUSES
3-phase 4-wire
11 12 13 14
11 12 13 14
A
B
C
UAUBUCUN
FUSES
11 12 13 14
A
B
C
N
UAUBUCUN
FUSES
11 12 13 14
A
B
C
3-phase 3-wire
UAUBUBUCUCUA
FUSES
11 12 12 13 13 11
A
B
C
3-phase 3-wire
UAUBUBUCUCUA
FUSES
11 12 12 13 13 11
A
B
C
3-phase 4-wire
N
UAUBUC
UNUNUN
FUSES
11 12 1314 14 14
AMC48 Voltage
AMC72/96 Voltage
Three phase current：
A
B
C
IA
*IAIB *IBIC *IC
S1 S2
S1 S2
S1 S2
***
*
*
*
4 5 6 7 8 9

DC series:
+
-
U+U-
FUSE
4 9
DC 1000V input
+
-
I+I-
DC 75mV input
7 9
+
-
U+U-
FUSE
5 9
DC 300V input
+
-
U+U-
6 9
DC 10V input
+
-
I+I-
DC 5A or 20mA input
8 9
75mV shunt Load
Note: 1. The symbol “*” indicates current input terminal, this wiring is for reference only , the specific wiring
diagram on the meter prevail;
2. Alarm output relay duplex with the second switching output (DO2).
4.5 Notice
4.5.1 Voltage Input
The input voltage must not be higher than the rated input voltage of the product ,otherwise PT should be
considered
1A fuse must be installed on the voltage input.
4.5.2 Current Input
Current input shall use external CT;
If the used CT connected with other meters, the connection should be used in series;
It is recommended to use wiring board ,do not connected with CT directly, in order to remove conveniently；
Before removing product ‘s current input connection, be sure to disconnect the CT primary circuit or short the
secondary circuit.
4.5.3 Additional function wiring
COM of analog output and switching input represent their own common end, it is not earthing actually.
Two-core shield cable is recommended for communication connection. Its wire diameter is not less than 0.5mm2 ,
connecting A B respectively , shielded layer single point to connect the earth or dangling .When wiring, the
communication line shall be far away from strong current cable and other strong electric field environment.

For connection mode in communication section are shown as following:
It is recommended to add a matching resistor between A and B at the end of the meter. The resistance range is 120Ω
~10 kΩ.
5 Operating description
5.1 Key function description
Table 4 Key function description
Key symbol
Function
SET ( )
Return to previous menu or Function switching
Left ( )
Same level menu shifting left or reducing data
Right ( )
Same level menu shifting right or increasing data.
Enter ( )
Enter Next level menu or Confirm.
Left+ enter ( + )
In programming mode, this key combination is used for the reduction of hundreds
of digits.
Right + enter ( + )
In programming mode, this key combination is used to increase the hundred digits.
Note: When using the combination key, you can firstly press the left or right key and then press the Enter key.
5.2 Programming menu
5.2.1 Menu symbol and its meaning
table 5
First menu
Second menu
Third menu
Description
0～9999
Password setting (initial password 0001)
0～255
LCD backlight control, when set to 0, the
backlight is always on, when set to 0-255,
the backlight is off after 0-255 seconds
ON/OFF
Whether the screen flashes when alarming
3P3L、3P4L
Electrical network (3-phase 3-wire,
3-phase 4-wire)
Note: just for 3 phase voltage

（ ）
1A、5A
（100V、400V、660V）
Current rated value
(Voltage rated value)
（ ）
0～9999
Current ratio
(Voltage ratio)
-9999～9999
Full scale display
-9999～9999
Zero display
（ ）
0～3
Decimal point
of current (voltage) display
-9999～9999
Shielding value
of zero display
1～247
Communication address
1.2、2.4、4.8、
9.6、19.2、38.4
Baud rate
(Example 9.6 means 9600bps)
None/2bit/odd/even
Communication mode
(No parity check、2-bit stop bit、odd parity
check、even parity check)
1，2，3
Analog output selection
4～20mA 或 0～20mA
4～20mA or 0～20mA
Output type
0～9999
High analog value setting
0～9999
Low analog value setting
0.do/1.AL
Alarm selection
0～20
Alarm delay or remote control delay (s)
0～9999
No action band setting
0～9999
High alarm value setting
0～9999
Low alarm value setting

0～100
Unbalance alarm setting (%)
Lo.on/Lo.of
Whether alarm is allowed when the signal
is 0
Version
5.3 Setting and use
The programming example introduces some of the options in the programming menu, such as current ratio,
analog output setting, and switching output setting etc.
Note: After the setting or selection is completed, press the Enter key to confirm. After confirming the
completion, press the SET key until the SAVE/YES page appears. At this time, you must press the Enter key to
confirm, otherwise the setting is invalid.
5.3.1 How to enter the programming menu
Single phase:
SET
Display interface
Use the left and right keys
to enter the password
Enter the programming
interface
Password interface
Three phase:
Press the SET key to
enter the password
interface
Use the left and right keys
to enter the password Enter the programming interface
5.3.2 How to save the modified parameters
Single phase:
SET
SET
Press the Enter key to save the
setting,or press the SET key to
return to return
Press the Enter key to
save the settings

Three phase:
Press the SET key to
return to the first
level menu.
S E T
S E T
Press the Enter key to
save the settings
Press the Enter key to save the
setting,or press the SET key to
return to return
Note: You do not need to save the parameter after modifying one. You can save all the parameters after
modifying them as described above.
5.3.3 How to modify the password, backlight time etc.
Single phase:
Password setting Backlight setting Whether the screen
flashes when alarming
Three phase:
Password setting Backlight setting
Wheth e r the sc r een
flashes when alarming
Use the left and
right key to modify
the password
Use the left and
right key to modify
the backlight time.

Enter the programming menu, press left or right key to select the LCd page, press Enter key to enter revising
condition, left or right key to modify the time to 000 ~ 255s.To LED display meter, this item is invalid.
000: the LCD backlight is always on;
250: the LCD backlight has no backlight after 250 seconds, and the backlight is turned off to extend the life of
the backlight.
5.3.4 How to modify the current rated value and current ratio
Single phase:
Modify current rated
value
Modify current ratio
Three phase:
Modify current rated
value
Modify current ratio
Use the left and
right key to modify
the current rated
value
Use the left and
right key to modify
the current ratio
Note: IN.I is the current rated value , IN.U is the input voltage rated value; IN.CT is the current ratio, and
IN.PT is the voltage ratio.

5.3.5 How to modify the DC display value
Full scale display Zero display Decimal point
Shielding value
of zero display
The DC voltage meter is the same, only one difference: U.P replaces A.P;
When the zero shielding value is set to positive, it means that if | display value | ≤set value, the display value
is 0(Fig. 6); When the set value is negative, then the display value is set value when the display value ≤set value
(Fig. 7).
图 6

图 7
DC meter setting
H: DC high point display value; L: DC zero point display value, A.P (U.P): Display decimal point
When the low point of the input is 0:
For example：The input signal is 0-75mV, and the relative display needs to be 0-1000A, then the setting will be:
H: 1000, L: 0, A.P: 0. So when the input is 37.5mV, the display will be 500 ((1000-0)*(37.5/(75-0))).
When the low point of the input is not 0:
For example: The input signal is 4-20mA, and the display needs to be 0-60.00Hz, then the chart of the
relationship will be as follows:
Setting: H: 6000, fi We can get L according to the chart: (In (H)-In (L))/In (L) = (Dis (H)-Dis (L))/ (Dis (L)-L).
So L= 0 – (6000-0) * 4 / (20 – 4) = -1500
A.P:2; so when the input is 4 mA, the display will be (6000-0) * (4/20) + (-1500) = 0Hz

5.3.6 How to modify the communication address, communication baud rate and communication mode
Single phase:
Modify address
Modify baud rate Modify mode
Three phase:
Modify address Modify baud rate Modify mode
Use the left and right key
to modify the communication
address.
Address range:1-247
Use the left and right key
to modify the communication
baud rate.
Use the left and right key to
choose the communication mode:
None/2bit/odd/even
5.3.7 How to modify the analog output parameter, the output range and the high and low values
Table 6
First analog output

Analog output selection
0001
0002
0003
U1/I1
U2/I2
U3/I3
4～20mA or 0～20mA
When the analog output is 20mA, the corresponding electrical parameter is taken as the highest
four-digit integer (the decimal point is ignored) and the last bit is zero.
Same as Ao.Hi
Single phase:
Analog output selection Modify output type High value setting Low value setting
Three phase:

Analog output selection Modify output type High value setting High value setting
Use the left and right
key to modify the
analog output selection
Use the left and right
key to modify the output
range.
TYPE:4～20mA or 0～20mA
Use the left and
right key to set
the high value.
Use the left and
right key to set
the low value
5.3.8How to modify the alarm item, set the alarm delay, set the high and low alarm value and the unbalance alarm
setting (1 way alarm is the same as 2 way alarm)
Table 7
First switching output
Alarm setting
0.do
1.AL
remote
control
alarm
When the SEL is 00 (remote control), DLY indicates the duration after the switching amount is
activated.
When the alarm item SEL is not 00 (alarm), DLY indicates the delay time before the switching
action.