Specifications

Electrical

• Input Voltage: DC 24 V ±10%

• Power Consumption: ≤ 2.5 A

• System Bus: 32‑bit

• Axis Support: Up to 4 axes (standard); expandable to 6

• Servo Interface: Analog / digital / serial servo compatible

Environmental

• Operating Temp: 0°C ~ 45°C

• Storage Temp: -20°C ~ +70°C

• Humidity: 5%–85% RH (non‑condensing)

• Altitude: ≤1000 m

• Protection: IP20 (indoor cabinet)

LED Status Indicators (onboard)

• L1 (Green): Blinking = normal operation

• L2 (Red): ON = system alarm (check CRT alarm code)

• L3 (Red): ON = no memory card detected

• L4 (Red): ON = watchdog / servo / axis card alarm (Alarm 920)

• L5 (Red): ON = sub‑CPU watchdog / 5th/6th servo alarm

• L6 (Red): ON = analog interface / DNC1 card fault

Safety Precautions

1. Power Off & Discharge: Disconnect 24 VDC and main AC; wait ≥5 minutes for capacitors to discharge.

2. ESD Protection: Always wear anti‑static gloves/wrist strap when handling the PCB.

3. No Live Work: Never insert/remove boards or cables with power applied.

4. Critical Component: Faulty installation may cause machine crash or injury.

5. No Modification: Unauthorized circuit changes void warranty and may cause fire/shock.

Installation Steps

1. Lockout/Tagout: Cut off all power; secure to prevent re‑energization.

2. ESD Setup: Use anti‑static gear.

3. Slot Insertion: Align PCB with backplane slot; insert firmly.

4. Secure Board: Tighten mounting screws (0.6–0.8 N·m).

5. Sub‑board Connection: Install MEM (memory), AXS (axis), I/O boards as required.

6. Cable Connection: Connect power, CRT/MDI, servo, spindle, and I/O cables per diagram.

7. Power‑on Test: Restore power; check LED L1 blinks and no red LEDs stay ON.

Compatibility

• CNC Systems: 0‑MC, 0‑TC, 0‑MD, 0‑TD

• Servo Drives: Analog (e.g., A06B‑604x), digital, serial types

• Sub‑boards:

  • MEM: A20B‑2000‑016x series

  • AXS: A20B‑2000‑018x series

  • I/O: A20B‑2000‑019x series

Maintenance

1. Quarterly Inspection: Check for burnt components, swollen capacitors, or discoloration.

2. Connector Check: Every 3 months, reseat and inspect all edge connectors for corrosion.

3. Cleaning: Use dry soft cloth only; no liquid cleaners.

4. Backup: Monthly save system parameters and PMC programs.

Troubleshooting

1. System No Power / Black Screen

   • Check 24 VDC input and fuse.

   • Reseat master board and power connectors.

   • Verify backplane voltage distribution.

2. Alarm 920 (Watchdog)

   • Reseat memory card and sub‑boards.

   • Check for short circuits or component damage.

   • Replace master board if alarm persists.

3. Servo Alarm / Axis Not Moving

   • Check AXS board seating and servo cables.

   • Verify servo amplifier power and enable signals.

   • Inspect encoder wiring and feedback.

4. L3 ON (No Memory Card)

   • Reseat or replace memory card.

   • Check card slot contacts for dirt/bending.