Magnetic Linear Measuring System. MS01 Technical manual

Transcription

1 Magnetic Linear Measuring System MS1 Technical manual

2 a The measuring scale is made of a polymerbonded ferritic material. An alternating magnetic field H is produced over the measuring carrier by systematic magnetisation with alternating north and south poles. The pole pitch is the measure for the distance between two pole changes. The characterisic value for the sensor is the field strength H y, which is perpendicular to the measuring scale and is represented over the entire length as a continuous sine wave. H y A [ m] S Magnetic field strength over the measuring scale N S Pole pitch N U [V] Signal period 36 el. H y A [ m] 9 el. phase offset The magnetic field strength detected by the sensor and the voltage signals generated c The sensor head Sensors convert the magnetic sine waves of the measuring scale into two separate sine / cosine voltages with 9 phase offset. Static magnetic fields of other wavelengths are suppressed considerably via a precisely calculated spatial arrangement of the sensors. d The circuitry collects the signals received from the sensor head and evaluates them. Optimising filters considerably reduce the effects of other static and dynamic magnetic fields on system accuracy. Different measuring rates and measuring resolutions are possible using interpolation, depending on the type of translation circuitry used. The measured values are output as AQuadB signals. Signal period 36 el. Signal period 36 el. U 1 U 2 9 el. phase offset 9 el. phase offset Input and output signals of translation circuitry with interpolation factor of 1.

3 [3] Reference signals [4] Output signals mm 2 Measuring scale with reference marks [3] Reference signals Individuel signal Magnetic scanning of an individual magnetic section leads to an incremental, i.e. counting measurement. Since it is frequently necessary to have an absolute reference for determining the positions, two further tracks with magnetic reference marks are on the measuring scale in addition to the incremental track. The reference signal output is assigned to exactly one measuring resolution increment. It is necessary to pass over the reference mark to obtain an absolute reference. [4] Output signals The translation circuitry digitized the sinusoidal signals from the sensor head and outputs AQuadB signals. These consist of 5 V TTL-Signals and in quadrature. Additionally, an single signal or an index signal U ist output and linked with output signals and. The inverse signals, and U of all output signals are also output. For reliable data transmission we recommend the input circuit shown on the right. We recommend a system such as the DS26LS32 as a possible line receiver system. If the MS1 Translation System detects an fatal error, all signal outputs (A, /A, B, /B, Z, /Z) will automatically be set high. To return to operation mode and reset all the signal outputs, cycle the power to the MS1 Translation System. Index signals are sent once per pole for the duration of a measuring resolution increment. In connection with these signals and external sensors (e.g. inductive proximity switches), one reference point can thus be produced per external sensor. The accuracy of the external sensor therefore does not directly affect the accuracy of the detection of reference points. It must be ensured, however, that the switching hysteresis of the external sensor is smaller than the value of one pole pitch (1 mm) so that its signal can be clearly assigned to an index signal. When disturbances are detected, the output signals are switched to the high-impedance condition. MS1 A signal B signal Reference signal DIN U U Input circuit of subsequent electronic circuitry Z Z1 Z2 12Ω 12Ω 12Ω +5V RS422 GND +5V RS422 GND +5V RS422 GND U Reference signal U Single signal Reference signal U Index signal U Center of measuring scale t R Pole distance Reference signals AQuadB Signals (in quadrature) t R t R = Delay time differential according to RS422 (DIN ) Power supply requirements: U = 24 V/DC I min = 2 ma Typical power consumption I Typ = 15 ma Specification Reference signals AQuadB Signals Signals Square wave signal U and Square wave signal and and its inverse signal U their inverse signals and per measuring resolution increment Signal width 9 18 Delay time t R = 2 ns Real time Signal level High U > 2.5 V by I = 2 ma U > 2.5 V by I = 2 ma Low U <.5 V by I = 2 ma U <.5 V by I = 2 ma Maximum load High I = 2 ma I = 2 ma Low I = 2 ma I = 2 ma Capacity C<1 pf C<1 pf Switching times Rise t < 5 ns t < 5 ns Fall t < 5 ns t < 5 ns

4 [5] Translation system [5] Translation system The evaluation system is composed of the translation circuitry and the sensor head. 7-pin cable connector Aluminum hard anodized For Ordering information see Page 17 Stainless steel, hardened Units of measurement millimeters inches The sensor head is permanently matched to the translation circuitry via the serial number. Connecting the sensor head to other electronic translation circuitry can lead to inaccuracies. The sensor head is connected to the translation circuitry by a 3 mm cable for transmitting the sensor signals. Extension cables up to 19 m long can be used for greater distances. The completly capsuled sensor head is unaffected by dust, oil and water. Due to the extremely hard surface and the wedge-shaped design of the sensor head, contaminations can be brushed aside easily. Characteristics of sensor head cables: Cable weight: Use of cable track: Temperature range: Chemically resistant to: 4 g/m at 2ºC (68 F): bend radius 5 mm; up to 4, cycles possible at 2ºC (68 F): bend radius 1 mm; up to 4, cycles possible at 2ºC (68 F): bend radius 2 mm; up to 2,5, cycles possible - 4ºC (- 4 F) to + 8ºC (176 F), max. 5 min. up to 12ºC (248 F) Oil, grease, water, effects of weather and UV radiation Chemically resistant under most conditions to: Acetone, alcohol, methanol, trichlorethylene Not resistant to: Protection class, cable with screwed plug : Hydrochloric acid, sulphuric acid, petrol IP67 Length: 3 mm (11.81 ) Caution: Laying the cable without sufficient slack can reduce the possible number of cycles considerably. Noesis Noesis Threaded fitting seen from rear Threaded fitting seen from front

5 [5] Translation system Translation circuitry The maximum possible measuring rate and the resolution of the measuring system are determined by the type of translation circuitry chosen. The following versions are available: Max. measuring speed Order index 6 m/min: 6 12 m/min: 12 6 m/min: 6 6 m/min: 6 Measuring resolution.1 µm (on request):.1.5 µm:.5 1 µm: 1 5 µm: 5 1 µm: 1 5 µm: 5 1 µm: 1 5 µm: 5 1 µm: 1 Protection class Order index IP4: 4 IP67: 67 Temperature ranges Range 1: C (32 F) bis 7 C (158 F): 1 Range 2: -4 C (-4 F) bis 8 C (176 F): 2 Reference signal Single signal: E Index signal: I Output signal AQuadB AB Units of measurement millimeters inches M4/6 deep M4/.236 deep Indicator LED green/red Switch-over buttons for set-up mode 7-pole housing socket for sensor cable 8-pole housing socket for connecting cable Power supply Data transfer

6 [6] Flexible measuring scale [6] Flexible measuring scale The flexible measuring scale consists of a.15 mm stainless steel strip with a magnetically coded tape attached with high-strength adhesive. It is suitable for dry environments with little contamination. If used with a stainless steel cover strip, the flexible measuring scale can also be used in more highly contaminated environmental conditions. Cover strip see accessories of flexible measuring scale. Accuracy class Order index 1. mm.3 mm Mechanical structure of flexible measuring scale Cover strip Hardened stainless steel Adhesive layer 1 Magnetic strip Adhesive layer Carrier strip Stainless steel Accessory is delivered in glued condition ±1 µm/m: 1 Adhesive layer 2 optional ± 5 µm/m: 5 Sensor head Flexible measuring scale with cover strip Units of measurement millimeters inches Flexible measuring scale Sensor head Flexible measuring scale without cover strip Cover strip Flexible measuring scale Mounting tolerances between flexible measuring scale and sensor head

7 Measuring protocol When ordering a measuring protocol please give us serial number of measuring system. 6 Noesis GmbH Weipertstraße Heilbronn Telephone ( 71 31) Fax ( 71 31) Measuring protocol MP12-KT1-NOE Reference devices n Laser interferometer HP 5527A, Measuring accuracy: ±1 nm Calibration certificate no.: 3741A929 n Temperature sensor, calibration character: 351/99, 352/99, JMT353/99 Accuracy class: ±5µm Serial number: S..123 Inspection number: 3 Date of measurements: Date Examiner 2 1 Position in mm Max. error per measured interval in µm

8 Ordering code [5] Translation system MS1 Translation Measuring Measuring Protection Temperature Reference Output system speed resolution class range signal signal Example: MS E AB Translation system: MS1 Measuring speed: 6 m/min Measuring resolution:.5 µm Protection class: IP67 Temperature range: 1 ( C to 7 C / 32 F to 158 F) Reference signal: single signal Output signal: AQuadB Ordering code [6] Flexible measuring scale MB1 Measuring scale Accuracy class Measuring length Adjustment Example: MB D Measuring scale: MB1 Accuracy class: ±1 µm Measuring length: 121 mm Adjustment: double-sided tape Ordering code [7] Rigid Measuring scale MT1 Measuring scale Accuracy class Measuring length Example: MT Measuring scale: MT1 Accuracy class: ±5 µm Measuring length: 121 mm Ordering code [9] Accessory ZB 51 [Connecting cable] Accessory Cable Length Example: ZB51 AK 4 Accessory ZB 51 [Extension cable] Accessory Cable Length Example: ZB51 VK 7 Accessory: Connecting cable: Length: ZB51 AK 4 m Accessory: Extension cable: Length: ZB51 VK 7 m Accessory ZB 51 [DIN rail bracket] Accessory DIN rail bracket Ordering code: ZB51 HB Accessory ZB 51 [Adhesives tape and glue] Accessory Ordering code: ZB51 F Liquid glue, 1 cartridge Accessory ZB 51 [Cover strip] Accessory Cover strip Measuring length Example: ZB51 DS 121 Accessory: ZB51 Narrow cover strip with double-sided adhesive tape: DS Measuring length: 121 mm