PR9268/202-100前置傳感器
伺服星以正交編碼器的形式向您提供電機位置輸出
信號消除了對附加位置反饋裝置的需要。產(chǎn)出如下：差分線(xiàn)路驅動(dòng)器。有一個(gè)相關(guān)的直流公共輸出（C4：引腳3），可以連接將共模噪聲和電壓峰值降至最低，以保護設備。由于控制器和驅動(dòng)器之間通常存在電位差，建議連接（如果出現接地回路，斷開(kāi)并重新測試）。
編碼器等效輸出（EEO）信號的來(lái)源取決于電機類(lèi)型
反饋裝置：本節從固件版本開(kāi)始介紹各種反饋類(lèi)型及其功能0.1.8.增量編碼器
輸出信號是實(shí)際編碼器反饋信號，在驅動(dòng)器的電機參數。它可以按2的倍數縮?。ň幋a：1、2、4、8、16）并且具有3MHz的最大頻率限制。
伺服星可以使用編碼器反饋來(lái)監控電機軸位置。相反旋轉變壓器是絕對位置反饋裝置，編碼器是增量裝置
其指示位置的變化。伺服星的編碼器分辨率（因此驅動(dòng)器的編碼器等效輸出）是固定的，因為它是
編碼器裝置。
編碼器接口包括三組導線(xiàn)
1.A/B（和補碼）線(xiàn)構成編碼器正交信號。信號是：在通過(guò)斷線(xiàn)之前通過(guò)線(xiàn)路接收器差分接收檢測電路。
2.窄指數脈沖通常每轉出現一次，表示已知軸的物理位置。該脈沖通過(guò)線(xiàn)路接收器差分接收然后通過(guò)斷線(xiàn)檢測電路。該信號是硬件可接受的。3.門(mén)廳信號提供表示
電機軸。根據該信息，電機可以正弦換向，直到檢測到索引信號-此時(shí)，真實(shí)位置已知。這些信號是：
由光耦合器隔離，并且可以是差分或開(kāi)路集電極型信號。當使用伺服星作為編碼器源時(shí)，推薦的電纜長(cháng)度不再是超過(guò)50英尺（15米）。長(cháng)編碼器電纜往往具有較高的直流電阻，可能會(huì )產(chǎn)生：編碼器供電線(xiàn)路中的顯著(zhù)負載效應。請仔細考慮這一點(diǎn)設計系統。允許使用更長(cháng)長(cháng)度的選項實(shí)現了位于電機處的獨立電源，為編碼器提供電源。返回到的正交信號驅動(dòng)器是差分連接的，這通常不會(huì )構成較長(cháng)電纜的問(wèn)題長(cháng)度。
分辨率和精度基于伺服星編碼器的系統通常顯示出最小的誤差編碼器本身。要獲得大致的總價(jià)值，客戶(hù)只需查看所用編碼器的規格。
The SERVOSTAR provides a motor position output to you in the form of quadrature encoder
signals eliminating the need for an additional position feedback device. The outputs are
differential line drivers. There is an associated DC common output (C4: pin 3) which can connect
to your port to keep common mode noise and voltage spikes minimized for device protection.
Because there are normally differences of potential between your controller and the drive,
connection is recommended (if ground loops occur, disconnect and retest).
The source of the Encoder Equivalent Output (EEO) signals depends on the type of motor
feedback device:
This section describes the various feedback types and how they function beginning with firmware version
0.1.8. Incremental Encoder
The output signal is the actual encoder feedback signal that is pre-configured (MENCRES) in the
drive’s motor parameters. It can be scaled down by multiples of two (ENCOUTO: 1, 2, 4, 8, 16)
and has a maximum frequency limit of 3 MHz.
The SERVOSTAR can use encoder feedback to monitor the motor shaft position. As opposed to
a resolver, which is an absolute position feedback device, the encoder is an incremental device
that indicates changes in position. The encoder resolution of the SERVOSTAR (and therefore
the drive’s encoder equivalent output) is fixed because it is a hardware characteristic of the
encoder device. The encoder interface includes three groups of wires:
1. A/B (and complements) lines make up the encoder quadrature signals. The signals are
received differentially through line receivers before being passed through a wire-break
detection circuit.
2. The narrow Index pulse normally appears once per revolution and indicates a known
physical position of the shaft. This pulse is received differentially through a line receiver
before being passed through a wire-break detection circuit. This signal is hardwarecapturable.
3. Hall signals provide information representing the approximate absolute location of the
motor shaft. From this information, the motor can sinusoidally commutate forward until
the index signal is detected - at which time, true position is known. These signals are
isolated by an opto-coupler and can be differential or open-collector type signals. The recommended cable length when using the SERVOSTAR to source the encoder is no longer
than 50 ft. (15 m). Long encoder cables tend to have high DC resistance that may create
significant loading effects in the supply lines to the encoder. Please consider this carefully when
designing the system. An option that would allow the use of longer lengths, implements a
separate supply located at the motor to source the encoder. Quadrature signals returned to the
drive are differentially connected which normally do not constitute a problem with longer cable
lengths.
Resolution and Accuracy
A SERVOSTAR encoder-based system typically exhibits minimal inaccuracies outside of the
encoder itself. To get an approximate total value the customer need only look to the
specifications listed for the encoder being used.
