Acrel AIM-T500 Manual de usuario

200

AIM-T500 Insulation Monitoring Device

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

2018.06.18

V1.0

First version

2019.01.15

V1.1

Modify error

2020.03.28

V1.2

Add overview content; Simplified model description;

Modify the opening size; Modify wiring terminal; Modify

the inaccurate part of the communication address table.

2020.07.03

V1.3

Modify the model description; Modify the typical wiring

diagram, modify the terminal, and modify the instrument

auxiliary power supply section description.

2022.02.30

V1.4

Modify the format, add modify records; Model description

Do not specify the model; Modify technical parameters.

Notes:

 
Contents 
 
Introduction.......................................................................................................................... 1
Functional characteristics..................................................................................................... 1
Type Introduction................................................................................................................. 1
Technical parameters............................................................................................................ 2
Reference standards ............................................................................................................. 2
Installation and connection .................................................................................................. 2
1 Shape and size................................................................................................................ 2 
2 Method of installation .................................................................................................... 3 
3 Wiring method................................................................................................................ 3 
4 Matters need attention.................................................................................................... 4 
Program and Usage .............................................................................................................. 4
1 Panel............................................................................................................................... 4 
2 LED instructions............................................................................................................. 5 
3 Function description of keys .......................................................................................... 5 
4 Operation instructions of keys........................................................................................ 5 
Communication Instruction.................................................................................................. 7
1 Modbus-RTU communication protocol ......................................................................... 7 
2 Introduction to the function code ................................................................................... 7 
3 Address table of AIM-T500........................................................................................... 9 
Typical applications ........................................................................................................... 10 
 
 
 
 
 
 
 
 

1 / 11

AIM-T500 Insulation Monitoring Device

1 Introduction

AIM-T500 insulation monitoring device is designed and developed by Acrel gathering the design

experience of electric power meter industry for many years to monitor the insulation condition of low

voltage IT distribution system (ungrounded system). The product adopts advanced micro controller

technology, with high degree of integration, compact size and easy installation, and it integrates

intelligence, digitalization and networking. The device, with many functions such as insulation fault

warning, fault alarm, event recording and so on, can be used in the mines, glass factories, electric

furnaces and test facilities, metallurgical plants, chemical plants, and exploded dangerous places,

computer center, emergency power supply and other places to monitor the insulation status of IT system

in real time. When insulation fault occurs, it will alarm and remind the staff to check the fault.

The products conform to the requirements of enterprise standard Q/VDCL-26-2017 IT System

Insulation Monitor.

2 Functional characteristics

2.1 Function of insulation resistance monitoring, warning and alarm for the monitored IT system.

2.2 Multiple fault indication function, such as relay alarm output and LED alarm output.

2.3 Advanced field bus communication technology, and it can communicate with the host computer

management terminal and monitor the operation status of the IT system in real time.

2.4 Fault event recording function. It can record the time and type of failure to provide convenience for

operators to analyze the operation status of the system and eliminate faults in time.

2.5 Applicable for insulation monitoring of AC, DC and AC / DC hybrid IT systems.

2.6 Self checking function. realize the fault self-inspection of instrument hardware circuit.

2.7 Broken line monitoring function. Monitor the connection condition of the PE/KE.

2.8 The free option of manual reset/automatic reset.

2.9 Wide range of measurement, Allowable leakage capacitance of the system is large.

3 Type Introduction

AIM

Design Number

Type of Product

Application

T500

Instructions: AIM for Acrel Insulation monitoring device;

T for Industrial;

500 for 500 type.

2 / 11

4 Technical parameters

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

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

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

5 Reference standards

■ 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 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

6 Installation and connection

6.1 Shape and size

AIM-T500 externality and installation size (unit: mm)

3 / 11

AcrelAcrelAcrelAcrelAcrelAcrel

ERROR

WARNING

ALARM

COMM

TEST/ESC MENU/

AIM-T500

Front view vertical view

The above diagram is the rear view, side view and front view of the AIM-T500 insulation

monitoring device of the embedded installation in succession.

6.2 Method of installation

The AIM-T500 insulation monitor adopts embedded installation, and the above diagram is the hole

dimensional drawing of the insulation monitor.

6.3 Wiring method

Upper terminals: T1, T2 (31, 32) are self-check terminals. They can judge whether the measurement

of the resistance of the instrument is accurate. This function must be used without access to the DC

system. Short connection with T1 and T2 will display instrument measurement results. F1, F2 (23, 24)

are interconnected terminals, when two ungrounded systems are interconnected. The instruments that

have access to F1 and F2 will stop working, and it will be monitored separately by another instrument.

AK (9) is an extension terminal, used for insulation monitoring of IT systems above AC690/DC800V,

see ACPD series manual for details. L1, L2 (4, 5) are connected to the monitored IT system (No three-

phase neutral phase IT system can be connected to any 2 phase; When a three-phase IT system with

neutral lines is connected, both L1 and L2 are connected to the neutral line; When the single-phase DC

system is connected, the L1 is connected to the positive stage and the L2 is connected to the negative

pole).

F1 F2

24 9

Lower terminal: KE, PE (28, 29) are instrument functional grounding lines. They need to be

separately connected to the field equipotential grounding terminal. The terminals of U1 and U2 (1, 2)

4 / 11

are instrument auxiliary power interfaces. A, B (18, 19) terminals are RS485 communication A and B

line interface respectively. They are used to communicate with the host computer. DO1+ and DO1-

(12, 13), DO2+ and DO2- (14, 15), DO3+ and DO3- (16, 17) are 3 sets of relay outputs. They

successively correspond to error alarm, fault alarm, and fault warning.

121314151617

PEKE

2829

1918

6.4 Matters need attention

6.4.1 Embedded installation of insulation monitor can be installed in a distribution cabinet.

6.4.2 When wiring is installed, connection should be made in connection with the wiring diagram. It is

best to connect the wiring with the needle sleeve connector before inserting the corresponding terminal

of the instrument and tighten the screws to avoid improper operation of instruments due to poor

contact.

6.4.3 The device provides asynchronous half duplex RS485 communication interface, adopts Modbus-

RTU protocol, and all kinds of data information can be transmitted on communication lines. In theory,

up to 128 devices can be connected to one line at the same time. Each device can set its address and

baud rate through the menu. It is recommended to use shielded twisted pair when communicating with

the upper computer system. The cross section of each core should not be less than 0.5mm2, and they

connect to A, B respectively. When shielding layer is connected to earth, wiring should be kept away

from strong cable or another strong electric field. It is recommended that a matched resistance in

parallel should be added between the A and B terminals of the most terminal insulation monitoring

device, and the recommended resistance is 120Ω .

6.4.4 The relay output, without power alarm , is a passive output, so an extra power supply is required

for the alarm(or caution light).

7 Program and Usage

7.1 Panel

Each part of the AIM-T500 panel is shown below.

LCD

LED

Key

LED

Type

AcrelAcrelAcrelAcrelAcrelAcrel

AIM-T500

ERROR

WARNING

ALARM

COMM

TEST/ESC MENU/

5 / 11

7.2 LED instructions

5 LED indicators are used to indicate the status of the insulation monitor:

"ON": when the device is working normally, the indicator light flickers, and the scintillation

frequency is about once a second.

"COMM": when the device has communication data to receive or send, the indicator light flickers.

"ERROR": when the device PE, KE breaks, the indicator light flickers.

"WARNING": When the insulation resistance of the monitoring is less than the warning value, the

warning indicator light flickers.

"ALARM": when the insulation resistance of the monitoring is less than the alarm value, the alarm

indicator light flickers.

7.3 Function description of keys

There are four buttons in the device. They are Self-checking /Backspace, Up key, Down key,

Menu / Enter respectively.

7.4 Operation instructions of keys

7.4.1 Key operation under the main interface

(1) When starting up, enter the main interface by default. If there is no other key operation, the

system will go into the main interface and work. The insulation resistance value, the leakage

capacitance value and the current system time are showed on the main interface.

Press up and

down key

Press ESC to return

Press up and

down key

ESC return

--------------------

SOE Record

--------------------

NO.01:alarm R= 4K

time:15-07-01 11:30

flip

2015-07-02 12:30:45

--------------------

+ IT-SYSTEM

--------------------

Insu. Rf > 10 MΩ

Leakage Ce = 000 uF

ESC return

--------------------

SOE Record

--------------------

NO.02:alarm R= 10K

time:15-07-01 11:28

flip

(2) Check the alarm record. In the main interface, one can enter the event record query interface

by pressing the "Up" or "Down" to turn the page to successively query the most recent 20 fault

records. The first one is the latest record, and the twentieth record is the oldest one.

(3) Self-examination of the instrument. When press the "TEST" button, the monitor will start the

Key

Key function

TEST / ESC

In the non-programming mode, it is used to start the self-checking;

In programming mode, it is used to exit.

Up key,

Down key

In the non-programming mode, it is used to read the alarm record;

In programming mode, it is used to increase or decrease the figure.

MENU/

In non-programming mode, press button to enter programming mode;

In programming mode, they are used as Backspace confirmation or selection

key.

6 / 11

self-examination program to simulate insulation faults and system errors. The 5 LED lights are on at

the same time, and the relay is closed. The self-check results will be displayed after 2S or so to check

whether the alarm and other functions of the instrument is normal.

7.4.2 Parameter setting

(1) Enter the menu

Under normal operation, enter the password input page by pressing the key. Set the size of number

by "Up" and "Down", press "" to enter the menu after inputting the correct password. Otherwise, the

password error will be displayed and automatically returned after 1s.

(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

Enter the menu and select "Security Settings". Press "Up" and "Down" to adjust the warning and

alarm values (long press is supported). Press The Back key to exit. At this time, you can choose

whether to save the settings. Press Enter to confirm and exit. (The default alarm value is 38K and the

early warning value is 60K)

(4) Communication Settings

After entering the menu, select Communication Settings and press Up or Down to adjust system

communication parameters (hold down is supported). Press The Back key to exit. At this time, you can

choose whether to save the settings. Press Enter to confirm and exit. (The default communication

address is 1 and baud rate is 9600).

(5) Setting of other information

The insulation monitor also provides the functions of Clearing Records, Password Setting, Software

Information, and Capacitor Setting. The settings of these parameters are similar to those described in

the preceding steps.

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