Table of Contents
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IK4/SK4 Series M
ounting inside a cylinder
85190A_MAN_Installazione_MK4-IK4/SK4_11-2012_ENG
MK4 and IK4/SK4 Series
Installation Manual
CONTENTS
PCUR034
floating cursor
(MK4-S and IK4-S)
(MK4-C and IK4-C)
output
Code 85190A Edition 11-2012
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Summary of Contents for gefran MK4 Series
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Page 1: Table Of Contents
MK4 and IK4/SK4 Series Installation Manual Code 85190A Edition 11-2012 CONTENTS Pag. eneral recautions MK4 Series Pag. orrect use of installation brackets MK4 Series PCUR034 Pag. orrect use of the floating cursor IK4/SK4 Series M Pag. ounting inside a cylinder Pag. -
Page 2: General Precautions
• When choosing a cursor for the MK4 profile magnetostrictive transducer, remember that the transducer’s cursor is a magnet. Therefore, if there are iron filings or small magnetic metal fragments in proximity of the transducer, avoid the use of sliding cursors, as there would be a risk of material accumulation on the cursor, creating problems for sliding. Use a floating cursor instead. MK4 SErIES – COrrECT uSE OF INSTallaTION BraCKETS B rackets code Interaxis (i) Screw (V) Dimension (A) -
Page 3: Mk4 Series C Orrect Use Of The
MK4 SErIES – COrrECT uSE OF THE PCur034 FlOaTING CurSOr Total length max ± 2 mm Total stroke Support Screws Cursor 2...7 mm Fig. 1 Fig. 2 Under standard conditions (Fig. 1), the PCUR034 cursor must be installed on a support made of non-magnetic material (such as brass, aluminium, or AISI316 stainless steel). The installation kit, consisting of two screws, two nuts, and two washers (all made of brass), is included in the package. The cursor (Fig. 2) must be installed with maximum attention to horizontal alignment with the transducer axis (maximum tolerance is ± 2 mm), as well as to the distance from the transducer surface from 2 to 7 mm (0 to 7 mm for MK4-S ver- sion with digital SSI interface). If there is no alternative to a magnetic sup- port, it’s necessary to prevent the support from changing the magnetic field generated Sol.1 Sol.2 by the cursor, because this could cause pro- Non-magnetic Magnetic Support Support Support magnetic blems with the correct measurement of the cursor position. Screws... - Page 4 SErIE IK4/SK4 - INSTallaZIONE IN INTErNO CIlINDrO C.E. Non-magnetic head Inactive Inactive zone zone ø 12.7 ø 10 Non-magnetic spacer Floating magnet IK4-S/C 47,5 63,5 IK4-A 0...1000 47,5 IK4-A 1250...4000 47,5 27,5 Fig. 5 For the correct installation of rod-type magnetostrictive transducers in hydraulic cylinders, remember that the cylinder head, must be made of non-magnetic material where the threaded hole will be drilled to install the transducer. If not, the residual magnetisation caused by drilling the threaded hole must be less than 4 Gauss. Rod-type magnetostrictive transducers are available with two types of threads: M18x1.5 or 3/4”-16 UNF. Refer to the drawings in figures 5 and 6 for the dimensions and tolerances to be respected when drilling the threaded holes and the related sealing surfaces. The sealing surface must be free of spiral or longitudinal scratches. • Ro 1,6 µm for O-rings with NON-pulsing pressure • Ro 0,8 µm for O-rings with pulsing pressure Rod-type magnetostrictive transducers are always supplied with an O-ring. If you need to replace the supplied O-ring , see the O-rings shown in figures 6 and 7. Version with thread M18x1,5 Suggested O-Ring: PARKER 6-349 15,4x2,1...
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Page 5: Instructions For Electrical Installation Of Magnetostrictive Transducers
To prevent alterations of the magnetic field generated by the cursor and, therefore, incorrect measurements by the transducer, the cursor must be installed by placing a non-magnetic spacer (made of brass, aluminium, stainless steel or plastic) between the piston surface and the cursor. Always use fastening accessories (screws, washers, etc.) supplied with the cursor. When necessary, always use non- magnetic accessories. Remember to position the cursor in such a way as to allow the correct measurement within the electrical stroke of the magnetostrictive transducer, preventing the cylinder stroke from bringing the cursor into inactive zones of the transducer. INSTruCTIONS FOr ElECTrICal INSTallaTION OF MaGNETOSTrICTIVE TraNSDuCErS The magnetostrictive transducers conform to the following directives: - Electromagnetic Compatibility EMC 2004/108/CE - RoHS 2002/95/CE For a correct electrical installation of the transducers, refer to the “Manual for Electrical Installation of Magnetostrictives.” The manual and certificates of conformity can be downloaded from the website www.gefran.com. DETaIlS ON MODElS WITH SSI OuTPuT (MK4-S and IK4-S) The diagram shows the operation of a sensor with SSI BlOCK DIaGraM Synchronous Serial Interface. The position of the magnet on the sensor is defined by the Magnet position signal provided by the sensor using the magnetostrictive technology. The displacement signal is supplied in binary or in Gray Code (24-25 bit) and transmitted to the controller by mean of the SSI interface. -
Page 6: Error Messages
ErrOr MESSaGES The SSI output goes to 0 if the echo is absent (magnet out of measurement range or internal device error). OVErSaMPlING OPTION The position of the magnet on the sensor is defined by the magnetostrictive technology. Internal position sampling can vary from 2 kHz to 500 Hz depending on the stroke. The displacement signal is supplied in binary or Gray code and transmitted to the controller via SSI. Normally, when data are available, they are transmitted to the SSI shift register, where they are available to the controller. Therefore, the shift register refresh rate is equal to the internal interrogation rate. In the version with “oversampling,” the transducer control electronics is synchronised with the SSI clock trains and provides an output before each interrogation. The supplied data are calculated via a first-order interpolation and are equal to: Out = M + V * T M = last internal measurement V = magnet speed T = time elapsed since last measurement The data is supplied to the shift regi- NOrMal OPEraTION Security time = 50 µS (compensated) Internal Measure ster considering possible Jitter in the Data on Out controller interrogation time (40 mSec Data Ready SSI Sample Time 250 µS sampling time is currently considered). Security time = 40 µS + 10 µS Lower Jitter levels ensure better inter- 10 µS MaX ErrOr IN CaSE OF Security time = 50 µS (compensated) JITTEr IN SaMPlING TIME polation results (see Figure 10). -
Page 7: D Etails On Models With Canopen
Fig. 11 Fig. 12 If the CANopen network terminates with a transducer, that transducer must contain a termination resistor. The termination resistor integrated in the transducer is an option that can be ordered by specifying it in the order code for the chosen model (see “Order code” on the datasheet). Each device connected in the CANopen network must have a unique node number that identifies it. Each magnetostrictive transducer is factory programmed with a standard node number of “127”. A few changes to the settings of transducers with CANopen output (such as node number, baud rate, etc.) can be perfor- med by connecting them to a CAN master and programming the parameters in the proper way. The communication protocol, the list, and the description of the transducer’s parameters are shown in the manual, that can be downloaded from the website www.gefran.com. DIaGNOSTICS OF MODElS WITH lEDS Some magnetostrictive transducers have LEDs to display some simple diagnostic functions. Based on the model, the state of the LEDs may have different meanings, as shown in the following table. IK4-a/SK4-a Series (analogue output) Serie IK4-a/SK4-a (uscita analogica red lED Meaning Transducer powered and working correctly flashing Echo absent (magnet out of measurement range or internal device error) Transducer not powered IK4-S Series (SSI output) and IK4-C Series (CaNopen output) - Page 8 GEFraN spa via Sebina, 74 25050 PROVAGLIO D’ISEO (BS) - ITALIA tel. 0309888.1 - fax. 0309839063 Internet: http://www.gefran.com 85190A_MAN_Installazione_MK4-IK4/SK4_11-2012_ENG...