REXRTOH RAC 2 Series Spindle Drive Controller and CDH1/CGH1/CSH1 Series Milling Machine Hydraulic Cylinder

REXRTOH RAC 2 Series Spindle Drive Controller and CDH1/CGH1/CSH1 Series Milling Machine Hydraulic Cylinder

Basic Information

Covering products

RAC 2 Series: Spindle Drive Controller, compatible with INDRAMAT 2AD asynchronous spindle motors (30-52kW) and 1MB frameless spindle motors, supporting spindle positioning and C-axis operation functions.

CDH1/CGH1/CSH1 series: milling machine type hydraulic cylinder, CDH1 is a differential cylinder, CGH1 is a double piston rod cylinder, CSH1 is a differential cylinder with magnetostrictive position measurement, suitable for various media such as mineral oil and water ethylene glycol.

Core applicable scenarios

Commonly applicable to CNC machine tools, industrial automation equipment, and heavy-duty transmission systems.

RAC 2 focuses on high-precision spindle control; The hydraulic cylinder is compatible with milling machines and hydraulic heavy-duty equipment, supporting multiple installation scenarios.

Comparison of core technical parameters

（1） Key parameters of RAC 2 series

Remarks on the numerical range of parameter items

Rated output power (motor shaft) 30-52kW continuous output

Input voltage 3 × 400V (50Hz ± 15%)/3 × 460V (60Hz ± 10%) directly connected to the three-phase power grid

Position resolution 1/4000000 RPM supports high-precision control of C-axis

Cooling method: Air cooling inside and outside the control cabinet, hose cooling, built-in fan+heat sink

Equipment weight 121kg including installation frame

Environmental temperature 5-45 ℃ (rated), maximum 55 ℃ (reduced capacity), humidity level F (DIN 40040)

（2） Key parameters of hydraulic cylinder series

Remarks on the numerical range of parameter items

Rated pressure 250bar Static test pressure 375bar

Piston diameter (Ø AL) 40-320mm in accordance with ISO 3320 standard

Piston rod diameter (Ø MM) 22-220mm matches with piston diameter

The maximum travel of 6m needs to be combined with anti buckling calculation

Medium temperature -20 ℃~+120 ℃ adjusted according to sealing type

Cleanliness requirements ISO 4406 20/18/15 require a matching filtering device

Protection level IP65 (main body), IP50 (partial output shaft) to prevent solid foreign objects and water splashes

Key points of safety regulations

（1） RAC 2 Security Requirements

Electrical safety

After power failure, wait for 5 minutes for the capacitor to discharge and confirm that the voltage is below 50V before operation.

Grounding conductor cross-sectional area ≥ 10mm ², leakage current>3.5mA, permanent and reliable connection.

Mechanical safety

Safety fences and emergency stop switches need to be installed, and the vertical axis requires additional mechanical locking. The standard motor brake does not meet personnel safety requirements.

The cooling air duct should be kept unobstructed to avoid overheating, and the temperature of the heat sink may exceed 60 ℃.

environmental safety

Pacemaker wearers are prohibited from entering the operating area, with a device protection level of IP10 (EN 60529).

The cooling of the control cabinet should avoid condensation water dripping onto electronic components, and the cooling temperature should not be lower than 40 ℃.

（2） Safety requirements for hydraulic cylinders

Pressure and Buckling Resistance

The maximum working pressure does not exceed 250 bar, and the pressure amplification caused by the area ratio needs to be considered.

When installed vertically, the allowable travel is calculated according to Euler's formula, with a safety factor of 3.5.

Environment and Protection

The corrosion protection level is divided into CP3-CP7, suitable for conventional to high salt spray environments near the sea.

To avoid lateral forces acting on the piston rod, it is necessary to ensure the mechanical alignment of the motion axis.

Installation and configuration specifications

（1） RAC 2 Installation and Wiring

Installation requirements

The installation of the control cabinet requires the use of M1-RAC 2 installation frame, with a minimum spacing of 150mm at the top and 80mm at the bottom.

The cooling method can be switched to air cooling inside the control cabinet, external air cooling, or hose cooling (M2-RAC accessories required).

core interface

X2 (standard interface): Control signal and analog output, 37 pins.

X3: Motor feedback connection, 15 pins; X4: Speed setpoint (simulated ± 10V/SERCOS).

X5: Additional encoder input, supporting spindle synchronization feedback; X13: Optional RS232/incremental encoder output.

（2） Hydraulic cylinder installation and adaptation

Classification of installation methods

|Installation method | Applicable series | Applicable scenarios|

|MP3 | CDH1/CSH1 | Base rotating earrings require swinging load|

|MP5 | CDH1/CSH1 | Base self-adjusting fork head, compensating for installation deviation|

|MF3 | Full Series | Head Circular Flange, Fixed Installation Axial Load|

|MF4 | CDH1/CSH1 | Circular flange base, integrated installation of the body|

|MT4 | Full Series | Ear Shaft Installation, Heavy Duty Swing Scenario|

|MS2 | Full range | Foot mount installation, horizontal/vertical fixation|

Key configurations

Sealing system: 9 designs (M/G/V/L, etc.), suitable for different media (mineral oil/water ethylene glycol/synthetic oil).

Position measurement: CSH1 supports IO Link/Profinet/SSI interfaces with a maximum resolution of 1 μ m.

Tightening torque: MF3 flange with a piston diameter of 100mm, bolt specification M12, tightening torque 100Nm.

Programming modules and accessories

（1） RAC 2 AS programming module

Core function: Store motor optimization parameters and application parameters, which can be directly reused when replacing the controller without the need for re debugging.

Compatibility: The updated module is compatible with the old module and supports parameter copying (PC or dedicated adapter).

Type code: Example AS 53/004-003, including controller model, software version, and motor adaptation information.

（2） Core components of hydraulic cylinder

Seals: M-type compatible with mineral oil, G-type compatible with mineral oil+water ethylene glycol, V-type compatible with synthetic oil.

Position measurement: IO Link interface powered 24VDC, transmission rate 230.4kBaud; Profinet supports RT/IRT protocols, with a maximum speed of 100MBit/s.

Auxiliary accessories: proximity switch (PNP normally open, IP68 protection), throttle valve, air release measurement connector.

Operations and Services

fault diagnosis

RAC 2 displays faults through the control panel, automatically brakes and loses power when faults occur. Refer to the supplementary documentation for troubleshooting.

Common problems with hydraulic cylinders: seal leakage (replace corresponding medium seals), position measurement deviation (calibrate sensors).

repair and replacement

RAC 2 replacement requires the use of lifting equipment, programming modules can be directly plugged and reused, and faulty equipment needs to be returned with a repair card.

The replacement of hydraulic cylinder seals needs to be selected according to the medium, and corrosion protection requires regular inspection of the coating (CP3-CP7).