Operating Manual SI251 SinCos interpolator for encoders and measuring systems with SinCos output Product features: Converts 1 Vpp standard sinus wave signals into incremental square wave signals Outputs A, /A, B, /B, Z, /Z (RS422 / TTL) and A, B, Z (18 … 30 V HTL) Adjustable multiplier for interpolation rates from 1 : 5 … 1 : 50 Adjustable divider 1 : 1 … 1 : 128 to reduce the output frequency Sinus-input frequency 0 … 400 kHz Quadrature output frequency up to 4 MHz Adjustable glitch filt
Version: SI25101a/ AF/ Nov. 04 SI25101b/ AF/HK/ Feb.05 Si25101c_oi/Jun-15/ag Description: Original Corrections with connectors male/female, DIL2 settings and miscellaneous small bugs „Safety Instructions“ and „Technical Specifications“ new. „Legal notices“ supplemented and manual-design updated. Legal notices: All contents included in this manual are protected by the terms of use and copyrights of motrona GmbH.
1. Safety Instructions and Responsibility 1.1. General Safety Instructions This operation manual is a significant component of the unit and includes important rules and hints about the installation, function and usage.
1.3. Installation The device is only allowed to be installed and operated within the permissible temperature range. Please ensure an adequate ventilation and avoid all direct contact between the device and hot or aggressive gases and liquids. Before installation or maintenance, the unit must be disconnected from all voltage-sources. Further it must be ensured that no danger can arise by touching the disconnected voltagesources.
2. Introduction SI251 represents an encoder interface unit, designed to convert output signals of so-called “sine-cosine-encoders” and similar measuring systems into incremental quadrature impulse signals. Under consideration of an adjustable multiplier the unit interpolates a corresponding number of impulses from every sine wave. An additional programmable divider provides division of the impulses if applicable, before they appear at the output.
Jumper 3. Block Diagram Power 8 3 2 1 +5 -6 A B Z Vdd = 20 V / 150 mA Vcc = 5.2V / 150 mA Encoder Supply 9 10 11 12 + GND /A ,/B, /Z, A, B, Z SIN+ SINCOS+ COSREF+ REF- Si251_01c_oi_e.
4. Connections The unit provides a 9-pin SUB-D connector (female on the unit site) for connection of the SinCos sensor. For easy power supply of the encoder, an external jumper allows to switch an auxiliary voltage of either 5.2 V or approx. 20 V to the same connector. Also the mean voltage is available on the connector pins, allowing also the use of sensors with non-differential sinus output.
4.1. Connection overview GND 5.2V VDD GND Encoder supply 18-30V Pushbutton and DIL switch 2 (Configuration) DIL-switch 1 iImpulse divider) Test Error release Error Out A (HTL) B (HTL) Z (HTL) female male LED’s At any time, the over-all transmission characteristics of encoder, external components and capacity of cable must ensure proper signals at the input of the unit, with respect to levels, shape and phase displacement A/B.
5. Pin assignment of SUB-D-connectors 5.1. Sin/Cos inputs Standard encoders with differential outputs can be connected directly to the corresponding pins SIN+, SIN-, COS+, COS-, REF+, REF-. Where longer cables must be used, terminating resistors between the non-inverted and the inverted signal of each channel may be of advantage.
When the reference signals REF+ and REF- are not used or not available, the related inputs of the converter must be tied to a defined potential. When connecting the REF- pin to Vm with the REF+ pin open, the unit will generate a Z impulse with every sine period. When connecting the REF+ pin to Vm with the REF- pin open, the unit will not generate a Z impulse. The sine-cosine signals on the input site are highly sensitive analogue signals! Therefore it is mandatory to use proper screening.
6. Switch settings Switch DIL1 allows to set the filter and to choose the interpolation rate and interpolation time. Switch DIL2 selects a programmable divider and allows to set the unit to test mode Changes of the DIL switch positions will become active only after the next power-up of the unit! 8 1 1 0 0 DIL1: ( 0 = OFF, 1 = ON ) 7 6 5 4 3 2 1 1 0 1 0 1 1 1 1 1 0 1 0 1 1 0 0 0 1 1 0 1 0 0 0 1 0 0 0 1 0 1 0 Si251_01c_oi_e.
Hints for settings of DIL switch 1: Under proper electrical conditions there is no imperative need to use the filtering functions offered in the table above. When you set your interpolation factor with use of the filter settings highlighted in the table, there will be no further restrictions with the operating range of the unit. se of the filtering functions will eliminate noise on the signal lines, but at the same time result in some limitations and restrictions of the operating range.
x12,5 25 ns 100 ns 400 ns 1600 ns Maximum output frequency 4 MHz 2.5 MHz 625 kHz 156.25 kHz Maximum input frequency 320 kHz 200 kHz 50 kHz 12.5 kHz x20 25 ns 100 ns 400 ns 1600 ns 4 MHz 2.5 MHz 625 kHz 156.25 kHz 200 kHz 125 kHz 31.25 kHz 7.8125 kHz x25 25 ns 100 ns 400 ns 1600 ns 4 MHz 2.5 MHz 625 kHz 156.25 kHz 160 kHz 100 kHz 25 kHz 6.25 kHz x40 25 ns 100 ns 400 ns 1600 ns 4 MHz 2.5 MHz 625 kHz 156.25 kHz 100 kHz 62.5 kHz 15.625 kHz 3.90625 kHz x50 25 ns 100 ns 400 ns 1600 ns 4 MHz 2.
7. Frequency Divider and Error Signals The programmable frequency divider provides decrease of the output frequency by an adjustable division rate between 1 : 1 and 1 : 128.
8. Delays There is a delay time between the analogue input signals and the incremental output signals, which is typically 3 µsec. when the divider is switched off. Use of the divider function will extend the delay time correspondingly. The delay time is constant, and causes a frequency dependent phase shift between the input and output signals. 9. Miscellaneous Hints The unit will reach full accuracy only after a transient period of approximately 20 full sine cycles at the input.
10. Dimensions 79 mm (3.110’’) 40 mm (1.575’’) 91mm (3.583’’) 74 mm (2.193’’) Front view Si251_01c_oi_e.
11. Technical Specifications Power supply: Encoder supply: SinCos input: „Error Release“ input: Incremental output HTL: Incremental output TTL / RS422: „Error“ output Housing: Ambient temperature: Failure rate: Conformity and standards: Input voltage: Protection circuit: Ripple: Consumption: Connections: Number of aux.
