KEBA CU312B

Technical Specifications

• Mounting Standard: 35 mm DIN top hat rail vertical mounting
• Overall Dimensions (W × H × D): 45 mm × 130 mm × 110 mm
• Net Unit Weight: 0.25 kg
• Primary Power Supply Input: 24 V DC, allowable range 18 V DC – 32 V DC with reverse polarity protection
• Typical Power Consumption: 5 W – 8 W continuous operation
• Main Processing Core: 32-bit ARM Cortex-A8 processor with integrated FPU floating-point arithmetic unit
• Onboard System RAM: 128 MB DDR3 industrial grade memory
• Onboard Flash Storage: 256 MB internal non-volatile flash memory, expandable via external SD card slot
• Real-Time Clock: Battery-backed RTC for timestamp logging and scheduled program execution
• Ethernet Communication Interfaces: 2 × independent 10/100 Mbps RJ45 ports, internal network switch integrated
• Fieldbus Interfaces: 1 × isolated CANopen bus port, 1 × RS232 isolated serial port, 1 × RS485 isolated serial port
• Peripheral Interface: 1 × USB 2.0 host port for program download and data storage
• Onboard Digital I/O Points: 16 discrete bidirectional digital I/O terminals
• Operating Ambient Temperature: -10 °C to +55 °C
• Storage Temperature Band: -25 °C to +85 °C
• Relative Humidity Operating Range: 5% – 95% RH, non-condensing atmosphere
• Shock/Vibration Compliance: IEC 60068 industrial automation standard

Function Features

1. Fanless fully passive cooling design eliminates fan maintenance and dust ingress failure points
2. Deterministic real-time operating system with guaranteed microsecond-level control task scheduling
3. Native support for charging station control logic: real-time charging current/voltage regulation, user touch HMI data synchronisation, charging session fault logging
4. Multi-industrial protocol stack: PROFINET, Ethernet/IP, Modbus TCP, CANopen, Modbus RTU
5. Integrated PID closed-loop control algorithm for temperature, pressure and charging power regulation
6. Full program logic password protection and encrypted firmware storage to prevent unauthorised modification
7. Comprehensive system diagnostic function: power supply monitoring, communication bus fault detection, I/O short-circuit alarm
8. Expandable program memory via external SD card for extended data logging and recipe storage

Performance Parameters

• Minimum control task cycle time: 250 μs
• Floating-point arithmetic execution cycle: < 1 μs per operation
• CANopen bus real-time data refresh rate: 1 ms maximum
• Ethernet TCP communication packet processing latency: < 5 ms
• Maximum supported digital I/O expansion via CANopen remote modules: 512 points
• RTC timekeeping drift: ≤ ±2 seconds per 24 hours continuous operation
• Flash memory data retention lifespan: 10 years without external power supply

Material Composition

• Outer housing: Extruded aluminum alloy with matte black oxidation surface treatment
• Internal PCB substrate: Multi-layer FR4 high-temperature industrial printed circuit board
• Communication connector components: Gold-plated RJ45, D-Sub serial connectors
• Terminal block assembly: PA66 glass-filled flame retardant thermoplastic with spring clamp wiring terminals
• Passive cooling structure: Integrated aluminum extrusion heat sink forming unit outer casing

Structural Characteristics

• Narrow compact DIN rail vertical mounting form factor for space-restricted small control cabinets
• Front panel layout: Status LED indicator array, USB host port, SD card expansion slot
• Rear panel layout: Power supply terminal block, digital I/O wiring terminals, fieldbus communication D-Sub connectors
• Fully sealed PCB compartment with dust filter vents for passive convection cooling
• Integrated DIN rail locking clip for fast tool-free mounting and disassembly
• IP20 overall protection rating for cabinet internal installation only

Working Principle

1. 24 V DC regulated power supply feeds internal power regulation circuit with reverse polarity and overvoltage protection filtering
2. ARM Cortex-A8 real-time processor executes user machine control program stored in internal flash memory under hard real-time OS scheduling
3. Digital I/O terminals acquire discrete sensor input signals and output switching control signals to actuators
4. CANopen, RS485 and Ethernet communication interfaces transmit real-time motion, process and charging data to remote HMI, drive modules and supervisory PLC systems
5. RTC module records timestamp for all fault events, charging session logs and scheduled control task triggers
6. PID control loop continuously samples process feedback signals and calculates output correction values for precise closed-loop regulation
7. Onboard diagnostic circuit monitors all internal power rails, communication bus signal integrity and I/O terminal short-circuit conditions, storing fault records in non-volatile flash memory

Advantage Highlights

1. Zero-fan passive cooling design delivers maintenance-free long-term continuous operation
2. Compact narrow DIN rail form factor reduces control cabinet volume requirement for small machine equipment
3. Built-in dedicated charging station control logic cuts custom programming development workload for EV charging infrastructure manufacturers
4. Full electrical isolation on all serial and CANopen fieldbus ports eliminates ground loop communication failure
5. Dual independent Ethernet ports enable simultaneous connection to machine local HMI and factory supervisory network without additional switch hardware
6. Wide operating temperature band supports outdoor charging cabinet installation without auxiliary heating/cooling equipment

Applicable Industries

Installation Requirements

1. Vertical mounting on standard 35 mm DIN top hat rail with locking clip fully engaged
2. Maintain minimum 40 mm vertical clearance above and below unit for convection cooling air flow
3. Install only inside sealed IP54 or higher industrial control cabinets to prevent dust and moisture ingress
4. Route power wiring and communication signal wiring into separate cable trunking with minimum 5 cm separation
5. Connect unit aluminum housing protective earth terminal to cabinet earth busbar with 1.5 mm² copper conductor
6. Do not mount adjacent to high-power resistors or variable frequency drives generating continuous radiant heat
7. SD card expansion slot must remain sealed with factory rubber dust plug during normal operation to avoid contamination

Usage Notes

1. Download complete control program backup to external storage before firmware upgrade procedure
2. Do not operate unit continuously above +55 °C ambient temperature to prevent processor thermal throttling
3. All fieldbus wiring must use shielded twisted pair cables with single-point shielding grounding at controller cabinet only
4. Replace RTC backup battery every 5 years to prevent timestamp loss during power outages
5. Avoid connecting unisolated external 24 V DC sensor power supplies to digital I/O terminals to eliminate ground potential damage
6. Clean aluminum housing cooling vents quarterly with dry compressed air to remove accumulated dust blocking heat dissipation
7. Firmware modification only permitted via official KEBA programming software to avoid internal OS corruption