Bosch Rexroth CIMS (Ceramax Integrated Measuring System)
The Drive & Control Company
Introduction
Extremely high demands are often placed on the continuous use of hydraulic cylinders, commonly in extreme ambient conditions. These cylinders are often employed in capital goods such as continuous casting machines in heavy industry, dredging vessels, offshore platforms, ship loading and unloading systems, tunneling machines, as well as bridges and sluices. Against this background, the market demands extremely durable products, fully capable to withstand corrosive and abrasive conditions.
Ceramax and CIMS in a hostile offshore environment
The Company
Since 1953, Rexroth Hydraudyne B.V. has been gaining expertise in the sale, design and manufacture of engineered-to-order hydraulic cylinders. Piston diameters range up to 1,450 mm and stroke lengths can be as long as 45,000 mm.
Bosch Rexroth is a group of companies specializing in the field of drive and control technology, with locations in all important industrial areas in more than 80 countries. The Bosch Rexroth Hydro Cylinder range is unique in the world thanks to its product scope and geographical distribution of both production and sales locations. Cylinder production facilities for standard cylinders, tie-rod and mill type up to 320 mm bore and 3 meter stroke are located in Germany, Sweden, Brazil, the United States and China. The larger bore and stroke cylinders as well as the ABS and special cylinders are produced for the world market in the Netherlands.
We are a solid basis for a business partnership.
Ceramax Engineered Coatings (CEC), the basis for CIMS
With its revolutionary Ceramax Engineered Coatings, Rexroth Hydraudyne developed a new internationally recognized range of piston rod coatings. Every cylinder in its specific application can have its own optimized engineered cylinder rod coating, created for special circumstances and applications.
Each layer is applied with advanced processes like plasma spraying and HVOF spraying. Several different mixes of ceramic or metal matrix materials can be applied, depending on requirements for wear, corrosion and service life.
CEC can be applied to both Bosch Rexroth standard cylinder ranges CDL (light), CDM (medium), and CDH (heavy) as well as ABS or Application Based Standardization cylinders.
Use of one of the CEC rod coatings is a prerequisite for any application using CIMS, Ceramax Integrated Measuring System, another Rexroth Hydraudyne innovation. CIMS is a highly reliable, failsafe and accurate cylinder stroke measuring system.
CIMS MKII Operation Principal
A magnetic field is created and shaped between a permanent magnet and a grooved piston rod, covered with Ceramax coating. Two half bridged magneto-resistive elements, located in this magnetic field, produce sine and cosine signals which are the input for a tracking phase resolver. The outputs of this resolver are quadrature incremental counting pulses. For long distance transmission, these pulses are converted to RS422A differential output pulses. With appropriate cabling, shielding, impedance and counting equipment, the result is a simple, high quality, accurate and reliable displacement measuring system.
Production of CIMS MKII
CERAMAX CIMS groove pattern
Implementation
CIMS MKII cylinders can easily be implemented in customer controls. The RS422A differential counting pulses are protected against and insensitive to electrical noise. The pulses can be accepted by a variety of counters with differential line receivers.
CIMS MKII in combination with these devices can be used for:
- Control of position
- Read-out of position
- Safeguarding / limiting of position
- Triggering of external actions
Diagram showing the CIMS MKII signal flow: Magneto resistive sensor -> Conditioning -> Tracking phase resolver -> RS 422A line drivers -> standard CIMS MKII customer interfaces (Position loop controller, Programmable logic controller, Position display, Electronic CAM controller, CIMS MKII analogue converter).
Mechanical Lay Out
The CIMS MKII sensor and electronics are integrated in the cylinder head in a solid stainless steel housing outside the high pressure zone. They are fully protected against all environmental impacts. This construction also ensures easy serviceability and the possibility of offering redundant measurement solutions.
A variety of electro-mechanical cable outputs from a high performance IP67 connector up to IP68 high pressure protection is available. Also a certified EEx-version of CIMS MKII system is optional.
Standard IP 67 connector
IP 68 cable outlet
EEx version of CIMS MKII
Specification
CIMS MKII
| Category | Specification |
|---|---|
| Electronics Supply | 24 VDC ± 20%, 250 mA max |
| Position output | incremental encoder 1024 x (A+B) pulses / 10 mm (quadrature) |
| Output drivers | RS422A differential line drivers |
| EMC | IEC801 level 1 |
| Cable output | IP67 connector - IP68 hose/pipe |
| Protection class housing | IP68 (10 bar) |
| Stroke length | unlimited |
| Max. velocity | 1500 mm/s |
| Position accuracy | Linearity better than 1 mm, Temperature coef. ± 0.025 mm/°C |
| Long distance data transmission | up to 400 m possible |
| Temperature range | -25 °C up to 70 °C |
CIMS MKII converter
| Category | Specification |
|---|---|
| Supply | 24 VDC ± 20% |
| Power | 1 W max. |
| Input | Quadrature incremental A and B pulses in RS422A format (100 kHz max.) Input impedance 10 kΩ, Reset 5-24 VDC |
| Output | 0..10 V, 0..20 mA, 4..20 mA |
| Accuracy | Resolution ± 0,03% fs, Linearity ± 0,15% fs |
| Programmable | Temp. coeff. ± 60 ppm/°C (typical) over RS232 input: Stroke length, Output voltage or mA, Preset value |
| Mounting | DIN rail mounting RS32/TS33 |
Redundant CIMS MKII solution
Advantages
- Unlimited stroke length
- Basic accuracy better than 1 mm for all stroke lengths
- No calibration needed (1024 pulses/10 mm)
- Data transmission over hundreds of meters (RS422A)
- Standard incremental counting pulses (quadrature)
- Easy interfacing to customer electronics for measuring, safeguarding and control
- Explosion safe (EEx) optional
- Redundancy solutions possible
- Stainless steel housing (IP68)
- Easy serviceability without oil spillage
- All fragile parts protected against all impacts
- Extremely robust shock resistant
- Cable outputs fit for all environments
- Thousands of CIMS units in the field
- MTBF over 100,000 hours
CIMS MKII offers fully digital signals for direct digital operation without any loss of accuracy and need for calibration. For less demanding applications, conversion to analogue current or voltage is possible. This will add an additional inaccuracy of approximately 0.2% full stroke.
Metal tower, Rotterdam
Split hopper dredger
CIMS MKII is the solution for all applications:
- Heavy Industry
- Offshore, Marine, Dredging
- Civil Engineering
- Mining and Material Handling
- Presses
- Servo/Simulation
CIMS MKII - functional and reliable under all environmental conditions
Roll change system
Hard rock drilling machine
Contact Information
Bosch Rexroth Corporation
Industrial Hydraulics
2315 City Line Road
Bethlehem, PA 18017-2131
Telephone: (610) 694-8300
Facsimile: (610) 694-8467
www.boschrexroth-us.com
Bosch Rexroth Corporation
Corporate Headquarters
5150 Prairie Stone Parkway
Hoffman Estates, IL 60192-3707
Telephone: (847) 645-3600
Facsimile: (847) 645-6201
Bosch Rexroth Corporation
Electric Drives and Controls
5150 Prairie Stone Parkway
Hoffman Estates, IL 60192-3707
Telephone: (847) 645-3600
Facsimile: (847) 645-6201
Bosch Rexroth Corporation
Linear Motion and Assembly Technologies
816 E. Third Street
Buchanan, MI 49107
Telephone: (616) 695-0151
Facsimile: (616) 695-5363
Bosch Rexroth Corporation
Pneumatics
1953 Mercer Road
Lexington, KY 40511-1021
Telephone: (859) 254-8031
Facsimile: (859) 281-3491
Bosch Rexroth Corporation
Mobile Hydraulics
1700 Old Mansfield Road
Wooster, OH 44691-0394
Telephone: (330) 263-3300
Facsimile: (330) 263-3333
RA 17 029/10.02
Printed in the United States
