Huichuan H3U series PLC high-performance motion control selection and troubleshooting guide

CANopen slave offline terminal resistor not connected, address conflict, inconsistent baud rate. Add a 120 Ω resistor and rescan the node

Electronic cam asynchronous spindle encoder interference, insufficient use of shielded wires for cam gauge points, increased cam gauge density

AutoShop cannot download USB driver not installed, cable failure reinstalls driver, switch to H2U-232-CAB serial port cable

Remote analog module reading abnormal range configuration error, module not calibrated check GL10-4AD/4DA input range setting, perform calibration

Replacement and Upgrade Guide

7.1 Upgrading from H1U/H2U to H3U

The Huichuan H1U/H2U series were early products that were gradually discontinued. When upgrading to H3U, please note:

Hardware replacement: H3U installation size is compatible with H2U, but there is a slight change in the definition of I/O wiring terminals, and the position of the common terminal needs to be checked.

Program porting: The H1U/H2U instruction set is mostly compatible with H3U, but certain special features (such as the high-speed counting instruction HSC) need to be modified. AutoShop provides a conversion wizard that automatically checks for incompatible commands.

Communication protocol: H2U's CANlink protocol is fully compatible with H3U, and remote I/O modules can continue to be used.

Program capacity: H1U has a maximum of 8K steps, H3U has 64K steps, but the original program may need to optimize the scanning cycle (because H3U is faster and timing sensitive programs need to adjust the timer).

7.2 Replacement of third-party PLC (such as Mitsubishi FX3U)

H3U is highly similar in command to Mitsubishi FX3U, but not 100% compatible. Attention should be paid during transplantation:

Software component range: Mitsubishi's M8000 and other special relays may correspond to different addresses in H3U, please refer to the mapping table in the Huichuan manual.

Positioning instruction: DDRVA and DDRVI parameters have the same order, but there may be differences in acceleration and deceleration time units.

MODBUS command: Mitsubishi uses RS command, H3U uses MODBUS function block.

Recommended practice: completely rewrite the program and utilize AutoShop's ladder diagram editing function instead of directly converting.

Maintenance and spare parts recommendation

8.1 Battery replacement

H3U uses CR2032 lithium batteries (with leads, model H2U-BAT) to maintain real-time clock and power-off data. When the battery voltage is low, the PLC will sound an alarm (special relay position). When replacing, it must be done while the PLC is powered on (hot plugging), otherwise the data will be lost. It is recommended to replace it every 3-5 years.

8.2 Regular Inspection

Clean the heat dissipation holes to prevent dust accumulation from causing overheating.

Check if the terminal screws are loose (recommended once a year).

For output points with frequent movements, regularly monitor the contact resistance.

8.3 Spare Parts List

Spare parts model and purpose

Battery H2U-BAT clock and data backup maintenance

Programming cable (USB) H2U-USB-CAB program download

Programming cable (RS232) H2U-232-CAB compatible with old PCs

Ethernet cable (3m) S6-L-T04-3.0 network communication

CANopen terminal resistor 120 Ω plug bus matching