Feedback 1

The Feedback view allows you to configure the primary position feedback deviceA process whereby some proportion of the output signal of a system is passed (fed back) to the input. In automation, a device coupled to each motor to provide indication of the motor's shaft angle, for use in commutating the motor and controlling its speed and position fitted to your motor.

When you select your feedback device from the Feedback Selection list, the appropriate feedback configuration choices appear below the dial.

Overview

The AKD offers a variety of feedback solutions, which allow you to optimize your system based on your specific machine needs. The table below lists the currently supported feedback types. Your motor model number will indicate the type of feedback that you have.

Kollmorgen motors with digital feedback devices (such as SFD, EnDat, BiSS"Bi-directional Serial Synchronous interface" An open-source communication protocol for feedback devices. With BiSS, all of the computation for interpolation in regard to position occurs on the ASIC directly in the encoder and HIPERFACE , Tamagawa) are plug and play. With these motors, all feedback and motor settings are configured automatically. Third party motors or Kollmorgen motors with non-digital feedback types require that parameters be entered manually. See Non-Plug and Play Feedback Devices).

The following table lists current support for primary and secondary feedback:

		Primary	Secondary
Resolver	Std & Multi pole	Yes	No
SFD, SFD3		Yes	No
Incremental (Digital) Encoder	With Halls and Index	Yes	No
	No Halls with Index	Yes	Yes
	No Halls with No Index	Yes	Yes
Analog Sin/Cos Encoder	With Digital Halls	Yes	No
	With Digital Halls and Analog Index	No	No
	No Halls and No Index	Yes	No
EnDat 2.1	Single & Multi Turn	Yes	No
EnDat 2.2	All Digital	Yes	Yes
EnDat 2.2	Analog / Digital	Yes	No
BiSS, BiSS Mode C Renishaw	All Digital (Mode C)	Yes	No
BiSS, BiSS Mode C Renishaw	Analog / Digital	Yes	No
HIPERFACE, HIPERFACE DSL	Analog / Digital; Single & Multi Turn	Yes	No
HIPERFACE, HIPERFACE DSL	All Digital	Yes	No
Halls SensorA sensor is a type of transducer that converts one type of energy into another for various purposes including measurement or information transfer Only	Digital	Yes	No

Using Feedback Options

Use the Feedback screen to set up your system to match the proper feedback device. By default, the drive uses the Auto setting to detect feedback devices. This setting allows the drive to test the feedback device to see if it is a recognized plug and play device. If the drive recognizes the device, then all the parameters for that device and motor are loaded into the drive. Both the feedback and the motor information are now present in the drive and the system is operable.

If the feedback is a non- plug and play device, then you can choose from the list of supported devices in Feedback Selection list and then enter the line count manually. The following sections describe each supported device available in the Feedback Selection list and the input information required to configure each device.

Auto

This is the default setting and is used to determine if a plug and play device is available. If a plug and play device is available, the Auto mode is replaced by the feedback device detected, along with the appropriate resolution settings.

None

This setting can be used if no feedback device is connected to the X10 connector. This may be the case if FB2 or FB3 is used for position or velocity control.

Incremental Encoder

The incremental encoder is a non-plug and play device. Incremental encoders are available in a variety of line counts. If you select an incremental encoder option, the encoder resolution must be entered into the Rotary Encoder Resolution box. The units for this field are in counts per revolution, which is post-quadrature (multiplies the lines per revolution by 4).

Sine Encoder

Sine encoders are offered with different data communication protocols. These include EnDat, BiSS, HIPERFACE, and others. A standard sine-cosine encoder with simple analog communication is not a plug and play device. As with the incremental encoder, the line count is entered in the Rotary Encoder Resolution box.

EnDat 2.1, EnDat 2.2

These feedback device are plug and play when ordered as an option with AKM PSR motors.

BiSS Analog

These feedback devices are plug and play when ordered as an option with AKM PSR motors.

HIPERFACE, HIPERFACE DSL

These feedback devices are plug and play when ordered as an option withAKM PSR motors.

Resolver

The resolver feedback option is not plug and play. When selecting the resolver option, three specific parameters are set by default for the standard AKM PSR resolver: phase lag, transformation ratio, and feedback poles. Currently the AKD does not support non-Kollmorgen standard resolver options.

The resolver frequency is set to 6875Hz and cannot be adjusted.

SFD, SFD3

Smart Feedback DeviceA process whereby some proportion of the output signal of a system is passed (fed back) to the input. In automation, a device coupled to each motor to provide indication of the motor's shaft angle, for use in commutating the motor and controlling its speed and position (SFD) is Kollmorgen's most popular plug and play device. SFD allows for quick and easy setup from the Auto mode, which automatically configures the drive with the motor and feedback parameters.

Tamagawa

This feedback type is not available on models with extension type NA (AKD Models).

Halls Only

This feedback type only supports operating in TorqueTorque is the tendency of a force to rotate an object about an axis. Just as a force is a push or a pull, a torque can be thought of as a twist mode and Velocity mode.

Due to heavy quantization, large current spikes occur at hall transition points, it is advisable to tune the observer to a low frequency (like 10Hz) and set the observer gain appropriately to achieve the best operating results.