Acrel AIM-T500L Series User manual

375
AIM-T500L Series Industrial Insulation
Monitoring and Fault Locating Products
Installation and Operation Manual V1.4
Acrel Co., Ltd.

Declaration
Please read this instruction carefully before using this product. All pictures, logos and
symbols involved are owned by Acrel Co., Ltd. All or part of the content shall not be
reproduced publicly without written authorization by non-company personnel.
Please read the instructions and precautions in this operation manual carefully before
using this series of products. Acrel will not be responsible for personal injury or economic
loss caused by ignoring the instructions in this operation manual.
The equipment is professional electrical equipment, any related operation, need to be
carried out by special electrical technicians. Acrel is not responsible for personal injury or
financial loss resulting from the error of non-professional personnel.
The contents of this description will be updated and amended constantly, and it is
inevitable that there will be a slight discrepancy between the physical product and the
description in the product function upgrading. Please refer to the physical product purchased
and obtain the latest version of the description through www. acrel.cn or sales channels.

Modified Records
No.
Time
Versions
Reasons for revision
1
2018.06.18
V1.0
First version
2
2019.01.15
V1.1
Modify error
3
2020.03.28
V1.2
Add overview; Revise inaccurate content; Modify
the panel of ASG200 and AIL200-12. Modified
address table and added fault location records.
4
2020.08.10
V1.3
Modified the power supply in the wiring diagram.
Add dc input; Modified the wiring of ASG200.
Added AIL200-12 operation instructions.
5
2022.02.30
V1.4
Modify the format; Add modified records; Modify
technical parameters; Update transformer
information; Add operation instructions of fault
locator; Update the address table.
Note:

Contents
1 Introduction............................................................................................................................1
2 Functional characteristics.......................................................................................................2
3 Technical parameters..............................................................................................................2
3.1 AIM-T500L insulation monitor.......................................................................................2
3.2 ASG200 test signal generator..........................................................................................3
3.3 AIL200-12 insulation fault locator..................................................................................3
3.4 AKH-0.66L series current transformer ...........................................................................3
4 Reference standards ...............................................................................................................4
5 Installation and connection ....................................................................................................4
5.1 Shape and size.................................................................................................................4
5.2 Installation method..........................................................................................................5
5.3 Wiring method.................................................................................................................6
5.4 Typical application ..........................................................................................................8
5.5 Matters needing attention................................................................................................8
6 Program and Usage ................................................................................................................9
6.1 AIM-T500L insulation monitor.......................................................................................9
6.2 ASG200 test signal generator........................................................................................11
6.3 AIL200-12 insulation fault locator................................................................................12
7 Communication Instruction..................................................................................................14
7.1 Modbus-RTU communication protocol........................................................................14
7.2 Introduction to the function code..................................................................................14
8 Typical applications .............................................................................................................17
8.1 AIM-T500L typical wiring method...............................................................................17
8.2 AIM-T500L typical application diagram ......................................................................19

1 / 19
AIM-T500L Series Industrial Insulation Monitoring and Fault Locating Products
1 Introduction
With the development of industrial science and technology, residual current poses a great threat to
industrial production safety. In order to improve the continuity and reliability of power supply, many
important production sites adopt IT distribution system (ungrounded system).
AIM-T500L series industrial insulation monitoring and fault is specially developed by Acrel for IT
distribution system in industrial occasions such as mine, glass factory, electric furnace and test
equipment, ship, metallurgical plant, chemical plant, explosion hazard site, computer center and
emergency power supply. The system has rich functions, including insulation resistance monitoring,
insulation fault warning, insulation fault alarm, event recording, parameter setting, communication
networking, etc. When the system has grounding fault, it can give a timely alarm and accurately locate
the specific circuit of the fault to remind staff to check the fault in time.
The products conform to the requirements of enterprise standard Q/VDCL-26-2017 IT System
Insulation Monitor.
Type and Name
Picture
Introduction
AIM-T500L
insulation monitor
AIM-T500L insulation monitor adopts
advanced microcontroller technology, high
integration, small size, easy to install,
intelligent, digital, networking in one. wide
measuring range, fast reaction speed and large
allowable system leakage capacitance.
ASG200
test signal generator
ASG200 test signal generator can start and
produce test signals in time when insulation
fault occurs in the monitored IT system. It can
coordinate with insulation fault locator to
realize insulation fault location function and
send fault phase line.
AIL200-12
insulation fault
locator
AIL200-12 insulation fault locator adopts
high-precision signal detection circuit, and
AKH-0.66L series current transformer,
detection the signal of ASG200 test signal
generator, accurate location of the insulation
fault loop. every locator can locate 12 loops.
AKH-0.66 L series
current transformer
AKH-0.66 L series current transformer is
used with AIL200-12 insulation fault locator
together, ratio is 1000:1. It is installed in the
cabinet in the way of screw direct fixation.

2 / 19
2 Functional characteristics
2.1 AIM-T500L insulation monitor
■Monitor resistance of IT system real time, warning or alarm when the resistance exceeds the limit;
■Relay alarm output, LED alarm output and other fault indication modes;
■SOE function, convenient for staff to check and analyze the failure type and occurrence time, and
judge the operation status of the system;
■Self-check function, which can realize fault self-check of instrument hardware circuit;
■ Disconnect monitoring, real-time monitoring of PE/KE function grounding wire connection status;
■ RS485 interface, standard Modbus-RTU protocol;
■ CAN interface, custom protocol, used to interact with signal generator and fault locator;
■ Support manual/automatic reset modes;
■ Wide range of applications, suitable for AC, DC and AC-DC hybrid IT systems.
2.2 ASG200 test signal generator
■ Generate positioning signals and inject them into the ungrounded system;
■Indicate the phase line where the fault is;
■Manual startup positioning is supported;
■CAN bus technology is adopted to facilitate data interaction with other devices in the system.
2.3 AIL200-12 insulation fault locator
■ Locate and indicate the loop where the fault is;
■ A single AIL200-12 can locate up to 12 loops;
■ Each IT system can be connected to a maximum of 90 locators, with a total of 1080 loops;
■CAN bus technology is adopted to facilitate data interaction with other devices in the system.
2.4 AKH-0.66L series current transformer
■Rated current ratio 5A:5mA , select model according to the rated current of the loop;
■Coordinate with AIL200-12 insulation fault locator to achieve fault location.
3 Technical parameters
3.1 AIM-T500L insulation monitor
Item
Parameter
Accessory power supply
AC 85~265V; DC100~300V; 50/60Hz
Power dissipation
< 8W
System voltage
AC 0~690V; DC 0~800V; 40~460Hz
System application
IT system (online), Other system (offline)
Insulation
monitoring
Measuring range
1k~10MΩ
Alarm range
10k~10MΩ
Resistance accuracy
1~10k,1k; 10k~10M, ±10%
system leakage capacitance
<500μF
Response time (Ce=1μF)
<5s

3 / 19
Internal
parameters
Measuring voltage
<50V
Measuring current
<270μA
Internal DC impedance
≥180kΩ
Relay output
Error, Alarm, Warning
SOE
20 records (fault type, fault value, fault time)
Alarm type
LCD, LED indicator
Communication
RS485, Modbus-RTU; CAN, custom
Impulse voltage / Pollution Level
8kV/Ⅲ
EMC/ Radiation
IEC61326-2-4
Environment
Working temperature
-10 ~+65℃
Storage temperature
-20~+70℃
Relative humidity
<95%, without condensation
Altitude
≤2500m
3.2 ASG200 test signal generator
Accessory
power supply
Voltage
AC 85~265V; DC100~300V
Power dissipation
<7W
IT system
Voltage
AC 220V; 3AC 0~690V; DC 0~800V
Fault locating
Response time
<5s
positing voltage
20V/5Hz
positing current
0~10mA
Response sensitivity
——
Internal
parameters
EMC/ Radiation
IEC61326-2-4
Output
Relay output
——
Environment
Working temperature
-15~+55℃
3.3 AIL200-12 insulation fault locator
Accessory
power supply
Voltage
AC 85~265V; DC100~300V
Power dissipation
<5W
IT system
Voltage
——
Fault locating
Response time
<12s
positing voltage
——
positing current
——
Response sensitivity
>0.5mA
Internal
parameters
EMC/ Radiation
IEC61326-2-4
Output
Relay output
Alarm
Environment
Working temperature
-15~+55℃
3.4 AKH-0.66L series current transformer
Specifications
Rated current
Ratio
Accurate level
Rated load
Overload ratio
L-45
16-100A
5A:5mA
1 level
100Ω
10
L-80
100-250A
L-100
250-400A

4 / 19
L-150
400-800A
L-200
800-1500A
4 Reference standards
■ Q/ VCL-26-2017 IT System Insulation Monitor.
■ IEC 61557-8 Electrical safety in low voltage distribution systems up to 1000V a.c. and 1500V d.c. -
Equipment for testing, measuring or monitoring of protective measures - Part 8: Insulation monitoring
devices for IT systems.
■ IEC 61557-9 Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V
d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 9: Equipment for
insulation fault location in IT systems.
■ IEC 61326-2-4 Electrical equipment for measurement, control and laboratory use - EMC
requirements - Part 2-4: Particular requirements - Test configurations, operational conditions and
performance criteria for insulation monitoring devices according to IEC 61557-8 and for equipment
for insulation fault location according to IEC 61557-9.
5 Installation and connection
5.1 Shape and size
AIM-T500L insulation monitor appearance and size are shown as follows (unit: mm)
AcrelAcrelAcrelAcrelAcrelAcrel
ON
ERROR
WARNING
ALARM
COMM
TEST/ESC MENU/
AIM-T500L
Front view Side view
ASG200 test signal generator appearance is shown in the following figure (unit: mm)
1
U1 2 U2 7
L
6
H
8
L1/+ 14
PE
10
L2/- 12
L3
On L1/+
L2/-
L3
Comm
Acrel
ASG200
Test
Test Signal Generator
www.acrel.cn
Front view Side view

5 / 19
AIL200-12 Insulation fault locator appearance size as shown below (unit: mm)
L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12
AcrelAcrel
AIL200-12
On
Comm
L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12
AcrelAcrel
AIL200-12
Reset
ESC
Menu
www.acrel.cn
1 2 458 9 11 12
13 14 20 21 22 23 24
U1 U2 I 2 I 3 I 6 COM2
DO+ DO-
I 7
I 1
367
I 4 I 5 10 I 8
COM1
I12 I11I10 I 9
17 18
H L
Front view Side view
5.1.4 AKH-0.66 L series current transformer
AKH-0.66 L series current transformer dimension are shown in the table below:
φ
Product
model
Rated
current
(A)
Overall dimensions
(mm)
Hole size
(mm)
Installation dimensions
(mm)
product
weight
(g)
W
H
D
Φ
M
N
L
Φ2
L-45
16~100
75
75
22
46
65
65
4.3
4
200±10
L-80
100~250
120
120
23
81
105
105
4.4
4
380±20
L-100
250~400
140
140
23
100
124
124
4.6
4
460±30
L-150
400~800
196
205
24
150
175
180
4.6
6
850±50
L-200
800~1500
240
247
28
200
214
212
5
6
1200±50
Note: The current transformer with corresponding specifications should be selected according to the rated
current of the circuit and the thickness of the wire. (If you have special requirements on the shape and range of
the transformer, contact us)
5.2 Installation method
AIM-T500L insulation monitor adopts embedded installation (which can be installed in the
distribution cabinet), the size of the opening hole is as follows:

6 / 19
AGS200 test signal generator and AIL200-12 insulation fault locator are installed on a 35mm
standard guide rail and can be installed on the terminal block in the power distribution cabinet. The
installation effect is shown below:
5.3 Wiring method
AIM-T500L wiring method
6
H
32
T2
24
F2F1
23 9
AK
5
L2
4
L1
31
T1
7
L
CAN comm Test Lock Expand IT System
H, L (6, 7) are CAN communication terminals, which are used to communicate with the signal
generator and fault locator of the fault positioning system. T1 and T2 (31, 32) are self-check terminals,
which can determine whether the resistance measurement of the instrument is normal or not. This
function must be used without access to the DC system. Short-connect T1 and T2, and the instrument
self-test results will be displayed. F1 and F2 (23, 24) are interconnection terminals. When two sets of
ungrounded systems are interconnected, the monitor which F1 and F2 connected will stop working and
be separately monitored by another instrument, this is used for the situation of two-segment bus with
busbar coupling.
AK (9) is the extension terminal, used for insulation monitoring above AC690/DC800V, see ACPD
series installation and operation manual for details. L1, L2 (4, 5) are used to access the monitored IT
system (three-phase or single-phase IT system without neutral line is connected to any 2 phases. For
three-phase IT systems with neutral lines, L1 and L2 are connected to the neutral line, in a single-phase
DC system, L1 is connected to the positive pole and L2 to the negative pole).
121314151617
PEKE
2829
B
1918
A
1
U1
2
U2
Relay output Grounding 485 comm Power

7 / 19
DO1 (12, 13), DO2 (14, 15) and DO3 (16, 17) are the outputs of three sets of relays, which normally
correspond to the outputs of error alarm, fault alarm and fault warning respectively. PE and KE (28,
29) are the instrument functional grounding terminals, which shall be connected to the field
equipotential grounding terminal row respectively. A, B (18, 19) are the Interfaces A and B of RS485
respectively for communication with the upper computer. U1, U2 (1, 2) terminals are auxiliary power
interfaces for instruments, generally connected to 220V AC power supply.
ASG200 wiring method
1 2 3 4 5 6 7
U1 U2
8 9 10 11 12 13 14
PE
Power CAN comm IT System Grounding
U1, U2 (1, 2) terminals are auxiliary power interfaces for instruments, generally connected to
AC220V power supply. H, L (6, 7) are CAN communication terminals used for communicating with
insulation monitors and fault locator of fault locating products.
L1/+, L2/-, L3 (8, 9, 10) are used for access to monitored IT system (three-phase IT system access to
three-phase, single-phase IT system access to L1, L2; For single-phase DC systems, L1/+ is connected
to the positive pole and L2/- is connected to the negative pole). PE (14) is the instrument functional
earthing terminal and shall be connected to the field equipotential earthing terminal row.
AIL200-12 wiring method
1 2 3 4 5 6 7
U1 U2
8 9 10 11 12
Power 1~4 ZCT connect 5~8 ZCT connect
U1, U2 (1, 2) terminals are auxiliary power interfaces, generally connected to 220V AC power
supply. I△1~I△4 (3, 4, 5, 6) respectively access 1~4 loop residual current transformer. COM1 (7)
access other side with 1~4 loop of residual current transformer. I△5~I△8 (8, 9, 10, 11) respectively
access 5~8 loop residual current transformer. COM2 (12) access other side with 5~8 loop of residual
current transformer.
13 14 17 18 20 21 22 23 24
Relay output CAN comm 9~12 ZCT connect
DO+, DO- (13, 14) is relay output, corresponding to fault alarm output, as long as there is any alarm
signal along the loops, be closed. H, L (17, 18) is CAN communication terminal used to interact with
insulation monitor and signal generator of the fault locating products. I△9~I△12 (24, 23, 22, 21)
respectively access 9~12 loop residual current transformer. COM3 (20) access other side with 9~ 12
loop of residual current transformer.

8 / 19
5.4 Typical application
AIM-T500L series industrial insulation monitoring and fault typical application wiring method is
as follow:
N
U
V
W
PE
AC220V power supply
3 phase transformer
Nungrouded
AIM-T500L Insulation monitoring and fault locating
system diagram
Note: 1,The power supply is AC220V, which can be supplied in parallel
Lock
RS485
Test
CAN communication
If the N
line is
not
elicited,
access
any 2
phase in
the 3
PE
Load load load load
DO1~3
DOx+
DOx-
Alarm light
power for light
2,AIl200-12 has 12 loops for monitoring, it can be connected up to 90 in system
AIM-T500Linsulation monitor
121314151617
PEKE
2829
B
1918
A
1
U1
2
U2
3132 23
F2
24 9
AK
4
L1T1T2 F1
6 7
H L
5
L2
1
U1 2 U2 7
L
6
H
8
L1/+ 14
PE
10
L2/- 12
L3
On L1/+
L2/-
L3
Comm
Acrel
ASG200
Test
Test Signal Generator
www.acrel.cn
L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12
AcrelAcrel
AIL200-12
On
Comm
L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12
AcrelAcrel
AIL200-12
Reset
ESC
Menu
www.acrel.cn
1 2 4 5 8 9 11 12
13 14 20 21 22 23 24
U1 U2 I 2 I 3 I 6 COM2
DO+ DO-
I 7
I 1
367
I 4 I 5 10 I 8COM1
I12 I11 I10 I 9
17 18
H L
5.5 Matters needing attention
(1) Wiring shall be conducted according to the wiring diagram. It is better to press and connect the
wires with the needle-type sleeve joint, then insert the corresponding terminals of the instrument and
tighten the screws to avoid abnormal operation of the instrument due to poor contact.
(2) AIM-T500L has two communication interfaces, and the first one is RS485 communication
interface with Modbus-RTU protocol. When connected to the system, a bus can theoretically connect
up to 128 instruments simultaneously. The second is the CAN communication interface, which uses a
custom protocol for the data interaction between each component of the insulation fault locating
products. The CAN address of AIM-T500L defaults to 1, ASG200 and AIL200-12 only have one-way
CAN communication interface, the CAN address of ASG200 defaults to 1, and the CAN address of
AIL200-12 defaults to 1, and it can be set 1~90.
(3) It is recommended to use shielded twisted pair wire when connecting AIM-T500L to the upper
computer system. Each core section should be no less than 1.0mm2, connected to A and B respectively,
and the communication wire should be kept away from strong electric cables or other strong electric
field environment when wiring. Suggest the end insulation monitor of matching resistor in parallel
between A and B terminals, recommended value for 120Ω; Insulation fault location system CAN
communication interface connection, pay attention to the connection H and L, the distance is longer
than the suggested in head and tail end parallel matching resistance and recommended value for 120Ω.

9 / 19
(4) The relay output of AIM-T500L and AIL200-12 do not carry power, and the external alarm (or
warning light) shall be equipped with additional independent power supply.
6 Program and Usage
6.1 AIM-T500L insulation monitor
6.1.1 Display Panel
LCD
LED
Key
LED
Type
AcrelAcrelAcrelAcrelAcrelAcrel
AIM-T500L
ON
ERROR
WARNING
ALARM
COMM
TEST/ESC MENU/
6.1.2 LED
5 LED indicators are used to indicate the status of the insulation monitor:
"ON": when the device is normal, the indicator light flashes at a frequency of about once per second.
"COMM": when the device has communication data to send and receive, the indicator light flashes.
"ERROR": when the device PE, KE broken line, indicator light flashing.
"WARNING": When the monitored insulation resistance value is less than the warning value, the
warning indicator flashes.
"ALARM": When the monitored insulation resistance value is less than the alarm value, the warning
and alarm indicator light flashes.
6.1.3 keys function
There are four keys in the device, which are self-check/return, up/down, menu/Enter.
Keys
Function
TEST/ESC
In non-programming mode, it is used to start the self-check function;
In programming mode, for exit.
Up button,
Down button
In non-programming mode, it is used to view and browse fault records;
In programming mode, used to increase or decrease values.
MENU/
In non-programming mode, used to enter programming mode;
In programming mode, for validation.
6.1.4 keys operation
Button operation on the main interface
(1) Boot into the main interface by default. If no other keystrokes are performed, the system enters
the main interface and runs. The main interface displays the insulation resistance, leakage capacitance,

10 / 19
and current system time.
(2) Check the alarm record. In the main interface, press "up key" or "down key" to enter the event
record query interface, and turn the page by "up key" or "down key" to query the last 20 fault records
in turn. Article 1 is the most recent record and article 20 is the oldest record.
(3) Instrument self-test. Press the "Self-test" key and the monitor will start the self-test program to
simulate insulation failures and system errors.5 LED lights are on at the same time and the relay is
closed. The self-test result will be displayed after 2s to check whether the instrument functions
normally.
Press up and
down key
Press ESC to return
Press up and
down key
--------------------
SOE Record
--------------------
NO.01:alarm R= 4K
time:15-07-01 11:30
--------------------
SOE Record
--------------------
NO.02:alarm R= 10K
time:15-07-01 11:28
2015-07-02 12:30:45
--------------------
+ IT-SYSTEM on
--------------------
Insu. Rf> 10 MΩ
Leakage Ce= 000 uF
ESC flip view
ESC flip view
ESC return
--------------------
SOE Record
--------------------
AIL200:1 Loop:1 L1
time:15-07-01 11:30
Press enter
Press ESC
Parameter setting
(1) Enter the menu
If the system runs normally, press Enter to enter the password input page. Use the Up and Down keys
to change the password. Enter the correct password and press Enter to enter the menu. Otherwise,
"Incorrect password" will be displayed.
(2) LCD Settings
After entering the menu, select "LCD Settings" and press "Up" and "Down" to adjust the LCD contrast
(long press is supported). You can adjust the LCD backlight time. After the modification is complete,
press the "Back" key to exit. At this time, you can choose whether to save the setting and press Enter to
confirm and exit.
(3) Security Settings
Alarm setting is to set the insulation warning value and the insulation alarm value of the system. It
belongs to the menu of the same level as "Password Setting", and the steps to enter are the same. The
default warning value is 60K and alarm value is 30K.
(4) Communication Settings
Communication Settings can modify the communication address and baud rate, with the upper
computer communication, the default address 1, baud rate 9600.

11 / 19
AlarmSet Comm Set
ClearSOE Password
LCD Set Time Set
--------------------
--------------------
Save Set？
Yes No
--------------------
Input Password:
0000
--------------------
2015-07-02 12:30:45
--------------------
+ IT-SYSTEM on
--------------------
Insu. Rf> 10 MΩ
Leakage Ce= 000 uF
SW info. Cap Set
adjust
--------------------
LCD Set
--------------------
Contrast: 30
Time Hold: 060s
select
--------------------
Time Set
--------------------
Data Set:2020-03-01
Time Set: 09:18:29
--------------------
Alarm Set
--------------------
Warning: 60K
Alarm: 30K
--------------------
Comm Set
--------------------
Address: 001
Baud: 9600
--------------------
Password
--------------------
Input New Password
0000
--------------------
Language
--------------------
Chn Eng
Press MENU Press Up and Down to input password
Press Enter to confirm
Press ESC to return
Press Up and Down to select Yes or No
Press Enter to confirm
Press Up and Down to set LCDSet, press
ESC to save or exit
Press Enter to confirm
Press Up and Down to
select the TimeSet and
press Enter to confirm.
adjust select
adjust select
adjust select
adjust select
adjust select
Press Up and Down to
select the AlarmSet and
press Enter to confirm.
Press Up and Down to set TimeSet, press
ESC to save or exit
Press Up and Down to set AlarmSet, press
ESC to save or exit
Press Up and Down to
select the CommSet and
press Enter to confirm.
Press Up and Down to
select the Password and
press Enter to confirm.
Press Up and Down to
select the Language and
press Enter to confirm.
Press Up and Down to set CommSet, press
ESC to save or exit
Press Up and Down to set Password, press
ESC to save or exit
Press Up and Down to set password, press
ESC to save or exit
--------------------
Fault Location
--------------------
ON OFF
adjust select
Press Up and Down to
select the Location and
press Enter to confirm.
Press Up and Down to set password, press
ESC to save or exit
(5) Setting of other information
The insulation monitor also provides functions such as Time setting, Capacitance setting, Language
setting, and Fault Location, which are set by default before delivery. If the fault locating function is
required, keep it enabled. If you need to modify parameter Settings, refer to the preceding operations.
6.2 ASG200 test signal generator
6.2.1 Display Panel

12 / 19
1
U1 2
U2 7
L
6
H
8
L1/+ 14
PE
10
L2/- 12
L3
On L1/+
L2/-
L3
Comm
Acrel
ASG200
Test
Test Signal Generator
www.acrel.cn
LED
Key
Type
6.2.2 LED
5 LED indicators are used to indicate the current status of ASG200 test signal generator;
"On": when the device is normal, the indicator light flashes at a frequency of about once per second;
"Comm": when the device has communication data to send and receive, the indicator light flashes;
"L1/+": when insulation fault occurs in Phase A or L+, the indicator light will be on;
"L2/-": when insulation fault occurs in B phase or L-, the indicator light will be on;
"L3": when insulation fault occurs in Phase C, the indicator light will be on.
When insulation fault cannot be determined, L1, L2, and L3 are all on.
6.2.3 keys function
The Start button of the ASG200 test signal generator is reserved for manual fault location. After
manual startup, the signal generator interacts with the insulation monitor and fault locator information,
the instrument communication light flashes, and the interface of the insulation monitor displays the
start of manual fault location. If the insulation status of the system is normal, the insulation monitor
will return to normal after the re-measurement is completed.
6.3 AIL200-12 insulation fault locator
6.3.1 Display Panel
L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12
AcrelAcrel
AIL200-12
On
Comm
L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 L12
AcrelAcrel
Reset
ESC
Menu
www.acrel.cn
1 2 458 9 11 12
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U1 U2 I 2 I 3 I 6 COM2
DO+ DO-
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367
I 4 I 5 10 I 8 COM1
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H L
AIL200-12
Type LED
Key
Display

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6.3.2 LED
14 LED indicators are used to indicate the current status of AIL200-12 insulation fault locator:
"On": when the device is normal, the indicator light flashes at a frequency of about once per second.
"Comm": when the device has communication data to send and receive, the indicator light flashes.
"L1~L12": the corresponding indicator light will be on in case of short circuit and broken line of any
loop transformer from L1 to L12 and insulation fault.
6.3.3 Keys function
There are four keys in the device, namely " RESET/ESC ", " up/down ", " MENU/".
6.3.4 Operation Description
The user interface displays the status of 12 loops. You can press up or down to view the status. The
corresponding characters are described as follows:
Symbol
Symbol describption
01 -OK-, for 01 ZCT loop normally connected, normal state
01 OPEN, for 01 ZCT loop break line, abnormal state
01 -SC-, for 01 ZCT loop short circuit, abnormal state
01 OFF, for 01 ZCT loop channel is closed, normal state
01 -LC-, for 01 ZCT loop fault, fault state
To modify the settings, press OK and enter the password to enter the settings. The blinking character
indicates that you can modify the settings. You can change the default password. The default password
is 0001. The value ranges from 1 to 90. The default address is 1. The loop can be set to open or close.
If the loop is not connected to the transformer, the loop can be manually closed. After modifying the
settings, press the Back key to enter the screen for saving the settings. Press the up or down key to
select whether to save the settings. After confirming the saving, return to the main screen.
PS 0000, for password interface, the default password is 0001
Keys
Function
RESET/ESC
In non-programming mode, used to return to the superior menu;
In programming mode, used to exit the current operation;
Long press for device reset function.
Up button, down button
In non-programming mode, used for menu switching and password entering;
In programming mode, used for change values and switching states.
MENU/
In non-programming mode, press the button to enter the programming mode.
In programming mode, when enter confirm or select the key to use.

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PW 0000, for password modify, it can be set
Ad 0001, for CAN address, it can be set 1~90
CH 1-12, for 12 channel set, it can be set ON or OFF
01 On, for channel is open, the default is all of 12 channels are open, the channel
without ZCT can be set closed
01 OFF, for channel is closed, the channel with ZCT can be set open
n SAVE, for setting is invalid
y SAVE, for setting is valid
The specific key operation process is shown in the figure below:
If only one fault locator is connected to the system, manually close the loop that is not connected,
and other parameters default. If multiple fault locators are connected to the system, confirm the
transformer circuit connected to each fault locator and manually close the unconnected circuit; Set the
address of each fault locator to distinguish different fault locators. After the Settings are modified, exit
the Settings and select confirm to save. The fault locator will run automatically.
7 Communication Instruction
7.1 Modbus-RTU communication protocol
Meter RS485 interface adopts Modbus-RTU communication protocol, which defines the address,
function code, data, check code in detail. It is the necessary content to complete the data exchange
between the host and slave machine.
7.2 Introduction to the function code
7.2.1 Function code 03H or 04H: Read the registers

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This function allows to acquire the data by equipment and the system parameters. The number of
data requested by hosts has no limit, but cannot exceed the defined address range.
The following example shows how to read a measured insulation resistance value from No.01 slave
computer, with the address of the value of 0008H.
The host computer sends
Send
message
The slave computer
returns
Return
message
Address code
01H
Address code
01H
Function code
03H
Function code
03H
Start address
High byte
00H
Bytes
02H
Low byte
08H
Register
data
High byte
00H
Number of
registers
High byte
00H
Low byte
50H
Low byte
01H
CRC check
code
Low byte
B8H
CRC check
code
Low byte
05H
High byte
78H
High byte
C8H
7.2.2 Function code 10H: Write the registers
The function code 10H allows the user to change the contents of multiple registers, which can write
the time and date in this meter. The host can write up to 16 (32 bytes) data at a time.
The following example shows a preset address of 01 with an installation date and time of 12:00,
Friday, December 1, 2009.
The host computer sends
Send
message
The slave computer
returns
Return
message
Address code
01H
Address code
01H
Function code
10H
Function code
10H
Start address
High byte
00H
Start address
High byte
00H
Low byte
04H
Low byte
04H
Number of
registers
High byte
00H
Number of
registers
High byte
00H
Low byte
03H
Low byte
03H
Number of registers
06H
CRC check
code
Low byte
C1H
0004H data
High byte
09H
High byte
C9H
Low byte
0CH
0005H data
High byte
01H
Low byte
05H
0006H data
High byte
0CH
Low byte
00H
CRC check
code
Low byte
A3H
High byte
30H
Note: The above data is for reference only, see address table for register definition

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7.3 AIM-T500L address table
No.
Address
Parameter
Read/
write
Value range
Data
Type
1
0000H
Passwords
R
0000-9999 (default 0000)
word
2
0001H high
Address
R
1~247 (default 1)
word
0001H low
Baud rate
R
0~3: 4800, 9600, 19200, 38400
(unit bps) (default 9600)
3
0002H high
Contrast ratio
R
15-60 (default: 30)
word
0002H low
Display time
R
15~250 (unit second) (default 60, 15 light)
4
0003H high
Year
R/W
0~99
word
0003H low
Month
R/W
1~12
5
0004H high
Day
R/W
0~31
word
0004H low
Warning mark
R
0: none 1: warning 2: early warning and alarm
6
0005H high
Hour
R/W
0~23
word
0005H low
Minute
R/W
0~59
7
0006H high
Second
R/W
0~59
word
0006H low
Data stable
R
0 or 1 (0 invalid, 1 stable)
8
0007H high
Warning value
R/W
60~4999 (unit: k Ω) (default: 60)
word
0007H low
Warning value
9
0008H high
Alarm value
R/W
10~4999 (unit: k Ω) (default: 38)
word
0008H low
Alarm value
10
0009H high
Resistance value
R
1~10001 (unit: k Ω)
word
0009H low
Resistance value
11
000AH
SN (high 16 bits)
R
Default: 0000000000
word
12
000BH
SN (low 16 bits)
word
13
000CH
Reserve
word
14
000DH
Leakage capacity
R
0~500 (unit: μF)
word
15
000EH high
Symbol of broken
line
R
0: none
4:PE/KE broken line
word
000EH low
Current period
2~200 (unit s)
16
000FH high
Whether access
system
R
0: no access system
1: access system
word
000FH low
Reserve
17
0010H high
Fault
Record
1
STA1
R
The sequence number of incident record
word
0010H low
R
Incident1content: 0~2
0: a fault free record
1: early warning
2: alarm
18
0011H
resistance
value
R
incident 1 insulation resistance
word
19
0012H high
Year1
R
incident 1 time -year
word
0012H low
Month1
R
incident 1 time -month