Specifications

Electrical

Environmental

Mechanical

Key Features

• High‑capacity energy absorption: Safely dissipates large regenerative energy from high‑inertia or vertical loads, ideal for frequent acceleration/deceleration cycles.

• Compact add‑on design: Easily mounts in control cabinets alongside servo amplifiers without major layout changes.

• Overvoltage protection: Prevents DC link overvoltage faults (e.g., Alarm 5) in the main servo drive.

• Robust construction: Built for industrial environments, compatible with FANUC 0i, 16i, 18i, 30i/31i/32i series CNC systems.

• No additional control required: Operates passively when connected to the servo amplifier’s DC link.

Installation and Wiring

Mounting

Wiring

1. DC link connection: Connect the module’s DC terminals directly to the servo amplifier’s DC link (283–325 VDC).

2. Grounding: Connect the module’s ground terminal to the cabinet’s protective earth (PE) to minimize noise and ensure safety.

3. No control wiring: The module requires no 24 VDC control power or signal cables; it operates automatically based on DC link voltage.

Safety Precautions

• Disconnect all power to the servo system before installation or maintenance.

• Wait at least five minutes after power‑off for DC link capacitors (in both the amplifier and braking module) to fully discharge before touching terminals.

• Never touch high‑voltage terminals or exposed heatsink surfaces during operation (heatsink may reach high temperatures).

• Use only FANUC‑specified cables and connectors for DC link wiring.

• Ensure the cabinet has adequate ventilation to prevent overheating of the braking module and adjacent components.

Common Alarms & Troubleshooting

• Alarm 5 (LVDC): Low DC link voltage (check DC link wiring or main power supply).

• Overvoltage alarms: If overvoltage persists despite the braking module, verify module connection, check for damaged internal resistors, or confirm the module’s current rating matches the system’s regenerative load.

• Heatsink overheating: Clean dust/debris from the heatsink; check cabinet airflow or reduce frequent high‑load deceleration cycles.

Maintenance

• Regularly inspect the heatsink for dust buildup and clean it with compressed air (power off first).

• Check all DC link and ground terminal screws for tightness every 3–6 months.

• Inspect wiring for wear, damage, or loose connections.

• Replace the module if internal resistors fail (indicated by persistent overvoltage alarms or burning smell).

• Refer to FANUC manual B‑65162E for detailed maintenance procedures.

Applications

• CNC machine tools: Vertical axes (e.g., machining centers, lathes) requiring braking safety.

• Industrial robots: Systems with overhauling loads or frequent acceleration/deceleration.

• High‑inertia applications: Large rotary tables, heavy‑duty spindles, or gantry systems.

• Retrofitting: Legacy FANUC Alpha servo systems needing upgraded braking capacity。