Danfoss KBFRG4 Proportional Directional Valve User Guide
- July 8, 2024
- Danfoss
Table of Contents
Danfoss KBFRG4 Proportional Directional Valve
This product has been designed and tested to meet specific standards outlined in the European Electromagnetic Compatibility Directive (EMC) 2014/30/EU which repealed Directive 89/336/EEC, amended by Directives 91/263/EEC, 92/31/ EEC, 93/68/EEC and 93/97/EEC. For instructions on installation requirements to achieve effective protection levels, see the leaflet and Installation Wiring Practices for Danfoss’s Electronic Products leaflet 2468. Wiring practices relevant to this Directive are indicated by Electromagnetic Compatibility (EMC).
KBFRG4-05-XXXXXXXXXXX-NX1-X07-CO-N-01-H-001-00-ENXXX
The valve is a direct, solenoid-operated ISO 4401 size 5 high-performance proportional directional valve with spool position feedback. The integral amplifier, which is housed in a robust metal enclosure sealed against ingress of water and other fluids (IP67 rating), is positioned on top of the valve body. Powered by 24V nominal (18 -36V) supply, the amplifier features a CANbus interface.
- Digital amplifier with analog and CANbus interface
- Special spools designed for customer requirements
- 700 hours salt spray rating
- Vibration resistant design
- Full CE electromagnetic compatibility- 2014/30/EU
Spool data
Spool symbols
Functional symbol
Proportional directional valve (with integrated electronics
Spool type and flow rating
Symmetric spools
Baseline pressure drop Δp = 5 bar (72psi) per metering flow path, e.g. B to T. For actual maximum flow refer to power capacity envelope curves.
| Spool code | Spool symbol | Flow rating |
|---|---|---|
| 2C75N | 2C | 75 L/min (19.8 USgpm) |
| 2C70N | 2C | 70 L/min (18.5 USgpm) |
| 2C50N | 2C | 50 L/min (13.2 USgpm) |
| 33C75N | 33C | 75 L/min (19.8 USgpm) |
| 33C70N | 33C | 70 L/min (18.5 USgpm) |
| 33C50N | 33C | 50 L/min (13.2 USgpm) |
Asymmetric spools
Figure preceding metering type designator “N” e.g. (2C**N) is flow rating P–A, or A–T (“A” port flow). Figure after “N” (N***) is flow rating P–B, or B–T (“B” port flow).
| Spool code | Spool symbol | Flow rating |
|---|---|---|
| 2C75N45 | 2C | 75 L/min (19.8 USgpm), “A” port flow |
| 45 L/min (11.9 USgpm), “B” port flow | ||
| 2C50N25 | 2C | 50 L/min (13.2 USgpm), “A” port flow |
25 L/min (6.6 USgpm), “B” port flow
Model codes
WARNING
The Danfoss plug, part no. 934939, must be correctly fitted to ensure that EMC and IP67 ratings are achieved. The plug retaining nut must be tightened with a torque of 2-2.5 Nm (1.5-2.0 lbf ft) to effect a proper seal.
Note: Additional configurations are available upon request. Please contact you customer sales representative for details.
KBFRG4-05-XXXXXXXXXXX-NX1-X07-CO-N-01-H-001-00-ENXXX Valves with Integral Amplifier
Data is typical with fluid at 36 cSt (168 SUS).
Pressure and flow rates
Data is typical with fluid at 36 cSt (168 SUS).
Pressure rating
Rated Flow at Δp = 5 bar (75 psi) valve pressure drop
Amplifier adjusted from nominal 75 l/min P to A and 45 l/min P to B to the
target flows illustrated
Power capacity envelopes
Spool type 2C75N45
Frequency response (typical)
Signal to achieve 50 L/min ±10% looped equal flow P to B/A to T at Δp = 5 bar (75 psi) per metering edge at 0.1 Hz. KB valves are preset at the factory to compensate for the effect of spool overlap.
Mounting to ISO 4401 (Size 05)
This interface conforms to: ISO 4401-05-04-0-05 ANSI/B93.7M (and NFPA) size 05
7-Pin DIN connector configuration
CAN connector configuration
Electrical information
7-Pin plug command signals and outputs
| Pin D | Pin E | CANbus | Flow direction | |
|---|---|---|---|---|
| Analogue | Positive | 0V | P to A | |
| Analog | 0V | Negative | P to A | |
| Analogue | Negative | 0V | P to B | |
| Analogue | 0V | Positive | P to B | |
| Digital | Positive | P to A | ||
| Digital | Negative | P to B |
WARNING
All power must be switched off before connecting or disconnecting any plugs.
Baud rate & node ID setting
The baud rate and node ID can be set by SDO or 8 pin DIP switch. The default baud rate is 500 Kbps. Possible baud rates supported are 125 Kbps, 250 Kbps and 500 Kbps. The upper two MSB pins B7 & B6 are used for baud rate setting as per the table, while remaining 6 pins B5 to B0 are used for Node ID from 1 to 63.
DIP switch
Setting of node ID & baud rate:
- Switch up = 0
- Switch down = 1
Example for setting baudrate & node ID
- To set the Node ID use switch B0 (LSB) to B5 that is 6 bit node address; to set Node ID to 3 make switch B0 & B1 to 1 by pulling down, and remaining switches B2 to B5 make 0 by pulling up.
- To set the baud rate use switch B6 & B7 (MSB) that is 2 bit baud rate settings; to set baud rate at 500 Kbps make only switch B6 & B7 to 1 by pulling down.
CANbus connectors
The valve has two CANbus connectors in the form of 5-pin female and male M12 connectors. They are wired according to CANopen CIA standard. The valves comply to DS 301 and to DS 408 for valve control only.
Wiring
Connections must be made via the 7-pin plug mounted on the amplifier.
Recommended cable sizes are:
Power cables:
- For 24V supply 0.75 mm2
- (18 AWG) up to 20m (65 ft)
- 1.00 mm2 (16 AWG) up to 40m (130 ft)
Signal cables
0.50 mm2 (20 AWG)
Screen (shield):
A suitable cable would have seven cores, a separate screen for the signal wires and an overall screen. Cable outside diameter 8.0-10.5 mm (0.31-0.41 in)
LED Indications
A total of four LEDs are present in the valve. Two LEDs (one red & one green) are used as per CANopen DS303 standard, while remaining two LEDs are used for valve operating state indication.
- LED 1 & LED 3 are used for valve operating state indication.
- LED 2 & LED 4 are used for CANopen state indications.
CANopen LED Indications details
Application data
Fluid cleanliness
Proper fluid condition is essential for long and satisfactory life of hydraulic components and systems. Hydraulic fluid must have the correct balance of cleanliness, materials and additives for protection against wear of components, elevated viscosity and inclusion of air. Recommendations on contamination control methods and the selection of products to control fluid condition are included in the Danfoss publication 9132 or 561 “Guide to Systemic Contamination Control”., which also includes information on the Danfoss concept of proactive maintenance. The following recommendations are based on ISO 4406 cleanliness levels at 4 μm, 6 μm and 14 μm: For products in this catalog the recommended levels are 18/16/13. Danfoss products, as any components, will operate with apparent satisfaction in fluids with higher cleanliness codes than those described. Other manufacturers will often recommend levels above those specified. Experience has shown, however, that life of any hydraulic components is shortened in fluids with higher cleanliness codes than those listed above. These codes have been proven to provide a long trouble-free service life for the products shown, regardless of the manufacturer
Hydraulic fluids
Materials and seals used in these valves are compatible with antiwear hydraulic oils, and non-alkyl-based phosphate esters. The extreme operating viscosity range is 500 to 13 cSt (2270 to 70 SUS) but the recommended running range is 54 to 13 cSt (245 to 70 SUS). For further technical information about fluids see “Technical Information” leaflet B-920 or I-286S.
Installation
The proportional valves in this catalog can be mounted in any attitude, but it may be necessary in certain demanding applications, to ensure that the solenoids are kept full of hydraulic fluid. Good installation practice dictates that the tank port are piped so as to keep the valves full of fluid once the system start-up has been completed.
Seal kit
- For KBFRG4-05- 02-332751
Plug
- For KBFRG4-05
- 7-pin plug (metal): 934939
Service Information
The products from this range are preset at the factory for optimum performance; disassembling critical items would destroy these settings. It is therefore recommended that should any mechanical or electronic repair be necessary they should be returned to the nearest Danfoss repair center. The products will be refurbished as necessary and retested to specification before return. Field repair is restricted to the replacement of the seals.
Contact
Danfoss Power Solutions (US) Company
- 2800 East 13th Street
- Ames, IA 50010, USA
- Phone: +1 515 239 6000
Danfoss Power Solutions GmbH & Co. OHG
- Krokamp 35
- D-24539 Neumünster, Germany
- Phone: +49 4321 871 0
Danfoss Power Solutions ApS
- Nordborgvej 81
- DK-6430 Nordborg, Denmark
- Phone: +45 7488 2222
Danfoss Power Solutions Trading
- (Shanghai) Co., Ltd.
- Building #22, No. 1000 Jin Hai Rd
- Jin Qiao, Pudong New District
- Shanghai, China 201206
- Phone: +86 21 2080 6201
Danfoss can accept no responsibility for possible errors in catalogs, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed. All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
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