Mitsubishi Electric GT23 Series HMI Maintenance Guide

Mitsubishi Electric GT23 Series HMI Maintenance Guide

Series positioning and applicable scenarios

The Mitsubishi GT23 series is an economical graphic operating terminal in the GOT2000 family, including two models: GT2310 (10.4 inches) and GT2308 (8.4 inches), each of which is further divided into AC power supply type (VTBA) and DC24V power supply type (VTBD). This series adopts LED backlight and analog resistive touch screen, with a protection level of IP20 (the front panel is IP67F)? The actual manual is not clear, but it is usually IP65F. The GT23 series is suitable for small and medium-sized automation equipment that requires reliable human-machine interaction and is cost sensitive, such as packaging machinery, textile machinery, machine tool operation panels, etc.

Compared with the high-end GT27 series, the GT23 does not support advanced functions such as multi touch, gesture operation, built-in web server (GOT Mobile), video playback, and human body sensing, but retains basic monitoring, alarm, data recording, and rich communication interfaces, making it cost-effective. For production lines that still heavily use GT23, engineers need to master its hardware characteristics, installation specifications, and troubleshooting skills.

Hardware component and interface identification

Taking GT2310 as an example, its front panel and back are distributed with the following key components:

Number Name Function Description

1. Display the user interface and system practical menu on the screen

2 touch panel analog resistive, single touch, supports touch switch operation

3 POWER LED blue constantly on: power supply is normal; Orange constantly on: screen saver; Orange blue flashing: backlight malfunction; Extinguished: No power supply

4. Install buckles to secure GOT to the control cabinet panel

The installation switch is used for OS installation during GOT startup

6 SD card access LED constantly on: SD card installed; Blinking: Accessing; Extinguished: not installed or removable

The 7 SD card interface supports SDHC cards for project transmission and data recording

When the SD card cover is opened, access to the SD card is prohibited. When it is closed, access is allowed (providing hardware write protection)

9 USB interface (Host) TYPE-A, can connect USB mouse, keyboard, barcode scanner, USB flash drive

10 USB interface (Device) Mini-B, used for connecting personal computers to transfer projects

11 cable clamp mounting holes are used to secure USB cables and prevent accidental detachment

12 Terminal Resistance Setting Switch (Inside Cover) RS-422/485 Communication Port Terminal Resistance Switch, Factory Default OFF

Installation of GT11-50BAT lithium battery (optional) in battery holder 13, used to maintain clock and SRAM data

14 power terminals including power input, LG, FG terminals

15 Ethernet interface RJ45, used for connecting controllers or PCs

16 RS-232 interface D-sub 9-pin male head, connected to controller

17 RS-422/485 interface D-sub 9-pin female head, connected to controller

Engineering tip: Before disassembling the SD card, it is necessary to confirm that the SD card access LED is turned off, otherwise it will damage the data inside the card. The design of the SD card cover is hardware write protection - after opening the cover, GOT cannot write to the SD card, which is very practical in preventing viruses or accidental writes.

Installation and environmental requirements

3.1 Physical Installation

Use 4 installation buckles to secure the GOT in the control cabinet panel opening. Hole size: GT2310 is 288 × 218 mm (11.34 × 8.58 in), GT2308 is 226 × 166 mm (8.90 × 6.54 in).

Install screws with a torque of 0.36-0.48 N · m using a No.2 Phillips screwdriver.

Remove the protective film on the surface of the screen, otherwise it may be difficult to remove if it is not torn off for a long time.

The installation environment should avoid direct sunlight, high temperatures, dust, corrosive gases, conductive dust, and strong vibrations.

3.2 Environmental specifications

Project specifications

The working environment temperature ranges from 0 to 55 ° C (lowered by 5 ° C when installing the oil cover)

Storage temperature -20~60 ° C

Humidity 10~90% RH, no condensation

Altitude ≤ 2000 meters

Pollution level 2 (only non-conductive pollution, temporary condensation can cause conductivity)

Overvoltage category II or below

Anti vibration JIS B 3502/IEC 61131-2 standard

Anti impact 147 m/s ² (15G) three times

Key reminder: When the ambient temperature exceeds 40 ° C, the absolute humidity should not exceed 90% RH corresponding to 40 ° C. In addition, if a pressurized air seal is applied inside the control cabinet, it may cause gaps between the surface film and the screen, making touch operation difficult or causing the film to fall off.

Power wiring and power consumption

The GT23 series offers both AC and DC power versions, and engineers need to choose according to the on-site power supply conditions.

4.1 AC power supply type (VTBA)

Input voltage: AC 100~240V (+10%, -15%), 50/60Hz ± 5%

Maximum apparent power: GT2310 is 44VA, GT2308 is 30VA

Maximum power consumption: GT2310 ≤ 18W, GT2308 ≤ 11W

Surge current: ≤ 40A (4ms, 25 ° C, maximum load)

Allowable instantaneous power outage time: ≤ 20ms (above 100VAC)

Voltage endurance: 1500VAC for 1 minute between power terminal and ground

Insulation resistance: ≥ 10M Ω (500VDC)

4.2 DC Power Supply Type (VTBD)

Input voltage: DC24V (+25%, -20%)

Maximum power consumption: GT2310 ≤ 16W, GT2308 ≤ 11W

Surge current: ≤ 40A (2ms)

Allowable instantaneous power outage time: ≤ 10ms

Voltage endurance: 350VAC for 1 minute between power terminal and ground

Insulation resistance: ≥ 10M Ω (500VDC)

Wiring points:

Use 0.75~2.0 mm ² wires with M3 screw crimping terminals (RAV1.25-3, V2-S3.3, etc.).

Terminal screw torque: 0.5~0.8 N · m.

FG and LG terminals must be grounded with a grounding resistance of ≤ 100 Ω and a dedicated grounding wire cross-sectional area of ≥ 2mm ².

Unused terminal screws should also be tightened to the same torque to prevent short circuits.

Do not turn off the power for at least 5 seconds after powering on.

Engineering suggestion: For AC power supply type, if there is a large fluctuation in the on-site power grid, it is recommended to install a voltage regulator or UPS, otherwise an instantaneous power outage of more than 20ms will cause GOT reset. DC power supply type is more sensitive to voltage drop (10ms), and it is necessary to use a stable and reliable 24V power supply.

Touch screen usage and calibration

The GT23 adopts an analog resistive touch panel, which works by generating voltage division through pressure contact between two layers of conductive films, thus requiring single point touch. It is strictly prohibited to touch two or more points at the same time, otherwise it may cause nearby touch switches to malfunction and cause accidents.

5.1 Calibration Method

As the usage time increases, there may be deviations between the touch position and the displayed object, and touch calibration needs to be performed at this time. Calibration steps:

Enter the Utility menu of GOT.

Select 'Touch Panel Calibration'.

Follow the on-screen prompts to touch the center of the cross target in sequence.

Save after calibration is completed.

If the deviation still exists after calibration, it may indicate aging of the touch film and replacement of the front panel components is required.

5.2 Operation taboos

Do not press the screen with sharp objects (pens, screwdrivers) to avoid scratching or damage.

Do not apply heavy pressure or impact.

If there is a backlight malfunction (POWER LED flashing orange blue), the screen may darken but touch detection may still occur, but for safety reasons, it should be repaired as soon as possible.

Key points of communication interface configuration

6.1 RS-232 interface

D-sub 9-pin male head, used to connect Mitsubishi PLCs (such as FX series), barcode scanners, or other serial devices.

Pin definition: Please refer to the GOT2000 hardware manual.

6.2 RS-422/485 interface

D-sub 9-pin female head, supports multi-point communication (such as connecting multiple frequency converters).

The terminal resistor switch is located inside the SD card cover. When the GOT is located at the end of the RS-422/485 bus, the switch must be turned to the ON position; Turn the intermediate node to OFF.

The factory default is OFF. Please set it correctly according to the actual topology, otherwise communication may be unstable or reflection may occur.

6.3 Ethernet interface

RJ45, 10/100M adaptive.

Key Warning: When the GOT2000 series and GOT1000 series coexist on the same Ethernet, do not set the IP address of any device to 192.168.0.18. This address is the default address that may be used when starting the GOT1000 series, and repetition can cause communication abnormalities.

To ensure network security, measures such as firewalls and VPNs should be taken to prevent unauthorized access, DoS attacks, and viruses.

6.4 USB interface

The Host port (TYPE-A) can be connected to an external USB flash drive for project transmission and data recording, as well as to USB keyboards, mice, barcode scanners, and RFID readers.

The Device port (Mini-B) is used to connect PC transmission projects.

Before unplugging the USB device, you must select "Safely Remove USB Device" in the GOT utility menu and wait for a successful prompt before physically unplugging it. Forcefully removing may damage data or devices.

6.5 SD card

Supports SDHC (up to 32GB) for storing alarm logs, formulas, screen data, etc.

After inserting the SD card, the SD card cover must be closed, otherwise GOT cannot read or write.

Before unplugging the SD card, make sure that the SD card access LED is off (not flashing), or confirm that there is no access through the system signal. If GOT is forcibly unplugged while accessing, processing will be interrupted for about 20 seconds, during which screen updates, alarms, logging, and scripts will all pause, seriously affecting system operation.

Fault diagnosis and LED indication

7.1 POWER LED Status

State meaning processing

The blue constant light power supply is normal and functioning properly

Orange constant brightness screen saver mode can be awakened by touch or communication

Orange blue alternating flashing backlight fault backlight tube/LED failure, backlight needs to be replaced or sent for repair. At this time, touch operation may be disabled (depending on the model)

Turn off the power supply and check the power wiring and fuses

7.2 Backlight fault handling

When the POWER LED flashes orange blue and the screen darkens, touch input may be disabled (the manual clearly states that touch switch input is not available at this time). The backlight component or the entire machine should be replaced as soon as possible. Temporary measure: External lighting, using external switches instead of touch operation.

7.3 Communication Failure

If the communication cable is disconnected or the controller is not powered on, GOT will not be able to operate. In system design, it must be assumed that GOT communication failures will occur, and important operations should be performed through switches other than GOT. For example, the emergency stop button must be directly connected to the safety relay, rather than just through a GOT touch switch.

7.4 Battery Alarm

When the battery level is low, the practical menu will display an alarm. The battery model is GT11-50BAT (lithium battery). Replacement steps:

Power off (all phases).

Open the battery cover and remove the old battery.

Install a new battery and ensure correct polarity.

Reset the clock after powering on.

Attention: The battery is not rechargeable, disassembled, heated, short circuited, welded, or put into fire. Transportation of lithium batteries must comply with transportation regulations.

EMC and low voltage command compliance

The GT23 series complies with the EU EMC Directive (2014/30/EU) and the Low Voltage Directive (2014/35/EU). To ensure compliance, attention should be paid to the following during installation:

Control and communication cables must be routed separately from the main circuit and power lines, with a minimum spacing of 100mm.

Signal cables should use shielded wires and the shielding layer should be reliably grounded.

The power terminal and ground terminal must be connected correctly.

The installation environment should meet pollution level 2 and overvoltage category II.

For equipment used in EU countries, manufacturers are required to declare compliance.

Safety precautions (key)

The manual repeatedly emphasizes the following safety points, which engineers must strictly follow:

9.1 Design Phase

GOT malfunction may cause the output to remain ON or OFF, therefore important safety signals must be monitored externally (such as hardware interlock).

Do not use GOT as the sole warning device (such as emergency stop). Independent redundant hardware should be used.

When modifying PLC programs or parameters through GOT, it is necessary to reset GOT or power on again as soon as possible, otherwise it may cause unexpected actions.

9.2 Wiring and Installation

The installation or removal of GOT can only be done after power failure (all phases).

Tighten the terminal screws with the specified torque.

Avoid foreign objects such as metal shavings and wire ends from entering the interior of GOT.

In oil mist or chemical environments, an oil proof protective cover must be installed, otherwise liquid infiltration may cause malfunctions.

9.3 Operation and Maintenance

Do not touch the terminals when powered on.

Before cleaning or re tightening the terminals, the power must be turned off.

Do not disassemble or modify the unit.

Before contacting the unit, touch the grounded metal to release static electricity.

Avoid dropping or strong impact when handling GOTs.

9.4 Network Security

For GOTs connected through the network, firewall measures should be taken VPN、 Anti virus and other measures are taken to prevent illegal access and DoS attacks. Mitsubishi is not responsible for any issues caused by cyber attacks.

Precautions for Testing Operations

Before conducting trial runs (such as forcibly setting/resetting components, modifying the current value of word components, changing timer/counter settings, etc.), be sure to carefully read the manual and familiarize yourself with the operating methods. Do not modify device data used for critical system operations, as this may result in erroneous outputs and accidents.

Maintenance and spare parts management

Given the lifecycle of electronic products, the following recommendations are suggested:

Regularly backup GOT project files to PC or SD card.

Check the battery level and replace it every 3-5 years.

Clean the screen with a soft cloth dipped in neutral detergent and avoid using organic solvents.

Spare parts reserve: at least one GOT of the same model, as well as batteries, SD cards, USB cables, etc.

When backlight failure or touch deviation cannot be calibrated, contact Mitsubishi authorized service center for repair or replacement.