Instructions For Electrical Installation Of Magnetostrictive Transducers; D Etails On Models With Ssi Output; Data Format - gefran MK4 Series Installation Manual

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
Synchronous Serial Interface.
The position of the magnet on the sensor is defined by the
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.
The refresh rate can be up to 1000 measurements/second
(depending on the transducer's stroke).
The output is absolute, meaning that the data related to
the magnet position are immediately available when the
system is turned on again.
tm = 16 mSec, regardless of clock frequency
min
BauD raTE FOr DaTa TraNSMISSION (based on cable length)
Cable length
Baud rate
Max frequency: 1 MHz
Min frequency: 50 kHz
85190A_MAN_Installazione_MK4-IK4/SK4_11-2012_ENG

DaTa FOrMaT

Clock sequence
< 3 m < 50 m
1 Mbaud 400 kbaud
BlOCK DIaGraM
Fig. 9
< 100 m
300 kbaud
Time = Position
Start
Stop
Fig. 8
< 200 m < 400 m
200 kbaud 100 kbaud
Magnet
position
5