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Selecting options and determining the order code

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Cooling / Construction type (b)

8LVA servo motors are self-cooling and have a long, slim design. The motors must be installed on the cooling surface (flange).

Valid code: A

Size (c)

The 8LVA servo motor series is available in three different sizes (1, 2, 3). They have different dimensions (especially flange dimensions) and power ratings. These different sizes are indicated by a number represented by (c) in the model number. The larger the number, the larger the flange dimensions and power rating for the respective motor.

  • Cooling type
    Available sizes
    1
    2
    3
    A
    Yes
    Yes
    Yes

Valid codes: 1, 2, 3

Length (d)

The 8LVA servo motor series is available in two different lengths. They have different power ratings with identical flange dimensions. These different lengths are indicated by a number represented by (d) in the model number.

  • Length
    Available sizes
    1
    2
    3
    2
    ---
    Yes
    ---
    3
    Yes
    Yes
    Yes

Valid codes: 2, 3

Encoder system (ee)

Encoders are listed as part of the model number in the form of a 2-digit code (ee).

  • Size/Length
    Code for order key (ee) / Availability of motor encoders
    R0
    B1
    B8
    B9
    8LVx13
    Yes
    Yes
    ---
    ---
    8LVx22
    Yes
    Yes
    Yes
    Yes
    8LVx23
    Yes
    Yes
    Yes
    Yes
    8LVx33
    Yes
    Yes
    Yes
    Yes

General

Motors in the 8LV series are available with EnDat encoders as well as resolvers. The encoder system is listed as part of the model number in the form of a 2-digit code (ee).

A resolver is an analog encoder system. Resolvers are particularly robust against vibrations and high operating temperatures. Their disadvantage is the low precision of 6-10 arcmin. A multi-turn variant with resolvers is still not possible.

Digital encoders use a serial transfer protocol. This protocol is called EnDat. The EnDat protocol is a developed standard that incorporates the advantages of absolute and incremental position measurement and also offers a read/write parameter memory in the encoder. The embedded parameter chip is stored by B&R in this encoder memory. This data and the B&R ACOPOS systems form a plug-and-play drive solution. Absolute positioning can be used within a revolution with the single-turn variants. A homing procedure is not required because of the absolute position measurement. For applications where the motor covers several revolutions for positioning, a multi-turn encoder that can save up to 65535 revolutions can be used. A solution with a single-turn encoder variant with a homing procedure is also possible.

Resolver

RE-15-1-J04 resolvers are used in the motors.

  •  
    Encoder type / Order code(ee)
    R0
    Precision
    10 angular minutes
    Vibration during operation
    10 < f ≤ 500 Hz
    ≤500 m/s²
    Shock during operation
    Duration 11 ms
    ≤1,000 m/s²

EnDat 2.2 encoder

For the advanced, fully digital EnDat 2.2 protocol, the positions are generated directly in the encoder and communicated serially with the drive system. This transfer is very robust in relation to disturbances and is even certified for safety applications.

Digital drive systems and position control loops require fast and highly secure transfer of data obtained from position measuring instruments. In addition, other data such as drive-specific characteristics, correction tables, etc. should also be available. To ensure a high level of system security, measuring instruments must be integrated in routines for detecting errors and be able to perform diagnostics.

The EnDat interface from HEIDENHAIN is a digital, bidirectional interface for measuring instruments. It is able to output position values from incremental and absolute measuring instruments and can also read and update information on the measuring instrument or store new data there. Because it relies on serial data transfer, only 4 signal lines are needed. Data is transferred synchronously to the clock signal defined by the subsequent electronics. The type of transfer used (e.g. for position values, parameters, diagnostics, etc.) is selected using mode commands sent to the measuring instrument by the subsequent electronics.

  •  
    Encoder type / Order code(ee)
    B1
    B8
    B9
    Operating principle
    Inductive
    EnDat protocol
    EnDat 2.2
    Single-turn / Multi-turn
    M
    S
    M
    Battery-backed
    Yes
    No
    Revolutions
    65536
    1
    4096
    Resolution
    [bits single-turn / bits multi-turn]
    18/16
    19/0
    19/12
    Precision ['']
    120
    Switching frequency ≥ [kHz]
    Digital pos. in the encoder
    Vibration during operation - Stator
    Max [m/s2]
    300
    400
    Vibration during operation - Rotor
    Max [m/s2]
    300
    600
    Shock during operation max [m/s2]
    1000
    2000
    Manufacturer's product ID
    EBI 1135
    ECI 1119 FS
    EQI 1131 FS
    Manufacturer's website
    www.heidenhain.de

Valid codes: R0, B1, B8, B9

Nominal speed (nnn)

The nominal speed is listed as part of the model number in the form of a 3-digit code (nnn). This code represents the nominal speed divided by 100 at 80 VDC operation. It begins with zero. The code "030" corresponds to a speed of 3000 rpm.

  • Size/Length
    Available nominal speeds nN [rpm] at 80 VDC operation
    1500
    2100
    3000
    Code for order key (nnn)
    015
    021
    030
    8LVA13
    Yes
    ---
    Yes
    8LVA22
    Yes
    ---
    Yes
    8LVA23
    Yes
    ---
    Yes
    8LVA33
    Yes
    Yes
    ---

Valid codes: 015, 021, 030

Oil seal (ff)

The 8LV servo motors in sizes 2 and 3 are available with an optional Form A oil seal in accordance with DIN 3760. When equipped with an oil seal, the motors have IP65 protection in accordance with EN 60034-5.

Proper lubrication of the oil seal must be ensured throughout the entire service life of the motor.

Valid codes: See motion options table

Holding brake (ff)

Motors in the 8LV series can be delivered with a holding brake. It is used to hold the motor shaft when no power is applied to the motor.

Operating principle

The holding brake is controlled by the ACOPOS servo drive. It uses permanent magnets that are demagnetized when 24 VDC is applied to a magnet winding. This releases the brake.

This brake is designed as a holding brake and is not permitted to be used for operational braking! Under these conditions, the brake has a service life of approximately 5,000,000 cycles (opening and closing the brake is one cycle).

Loaded braking during an emergency stop is permitted but reduces its service life. The required brake holding torque is determined based on the actual load torque. It is recommended to take into account a safety factor of 2 for the load torque.

Technical data for the standard holding brake

  •  
    Motor size
    1
    2
    3
    Holding torque MBr [Nm]
    0.35
    2.2
    3.2
    Connected load POn [W]
    8
    8.4
    13.4
    Maximum speed nmax [rpm]
    6000
    12000
    12000
    Supply current IOn [A]
    0.33
    0.35
    0.56
    Supply voltage UOn [V]
    24 VDC +6% / -10%
    24 VDC +6% / -10%
    24 VDC +6% / -10%
    Moment of inertia JBr [kgcm²]
    0.013
    0.07
    0.38
    Mass mBr [kg]
    0.1
    0.16
    0.29

Valid codes: See motion options table

Shaft end (ff)

All 8LV servo motor shafts comply to DIN 748. They can be delivered with a smooth shaft or a keyed shaft (depending on motor size).

  • Smooth shaft end
    A smooth shaft end is used for a force-fit shaft-hub connection and guarantees a backlash-free connection between the shaft and hub as well as a high degree of operating smoothness. The end of the shaft has a threaded center hole.
     
    8LVA_Strichzeichnungen_Wellenende_glatt_3D_de
  • Keyed shaft end
    A keyed shaft end is used for a form-fit torque transfer with low demands on the shaft-hub connection and for handling torque in a constant direction.
    The keyways for the servo motors in this series conform to keyway form N1 in accordance with DIN 6885-1. Form A keyed shafts that conform to DIN 6885-1 are used. Balancing motors with keyways is done using the shaft and fitment key convention in accordance with DIN ISO 8821. The end of the shaft has a threaded center hole that can be used to mount machine actuators with shaft end cover plates.
     
    8LVA_Strichzeichnungen_Wellenende_Passfeder_3D_de

Valid codes: See motion options table

Special motor options (gg)

00...No special motor options

Motor version (h)

The motor version is automatically specified by the configurator and can be seen in the technical data.

Order code motor options (ff)

For the corresponding code (ff) for the order key, see the following table:

  • Code for
    order key (ff)
    Available for
    size
    Motor options
    Connection (300° stepless rotation)
    Oil seal
    Holding brake
    Shaft end
    D0
    1, 2, 3
    Double angular built-in connector
    ---
    ---
    Smooth
    D1
    2, 3
    Double angular built-in connector
    ---
    ---
    With key
    D2
    1, 2, 3
    Double angular built-in connector
    ---
    Yes
    Smooth
    D3
    2, 3
    Double angular built-in connector
    ---
    Yes
    With key
    D6
    1, 2, 3
    Double angular built-in connector
    Yes
    ---
    Smooth
    D7
    2, 3
    Double angular built-in connector
    Yes
    ---
    With key
    D8
    1, 2, 3
    Double angular built-in connector
    Yes
    Yes
    Smooth
    D9
    2, 3
    Double angular built-in connector
    Yes
    Yes
    With key
    S0
    2, 3
    Single-cable solution (hybrid)
    ---
    ---
    Smooth
    S1
    2, 3
    Single-cable solution (hybrid)
    ---
    ---
    With key
    S2
    2, 3
    Single-cable solution (hybrid)
    ---
    Yes
    Smooth
    S3
    2, 3
    Single-cable solution (hybrid)
    ---
    Yes
    With key
    S6
    2, 3
    Single-cable solution (hybrid)
    Yes
    ---
    Smooth
    S7
    2, 3
    Single-cable solution (hybrid)
    Yes
    ---
    With key
    S8
    2, 3
    Single-cable solution (hybrid)
    Yes
    Yes
    Smooth
    S9
    2, 3
    Single-cable solution (hybrid)
    Yes
    Yes
    With key

Example order 1

A three-phase synchronous motor of type 8LVA22 with a nominal speed of 3000 rpm has been selected for an application.

The connection should use a single-cable solution (hybrid). The motor should be equipped with a holding brake, a keyed shaft and an EnDat encoder.

The (ee) code for the encoder system is B1.

The (nnn) code for a nominal speed of 3000 rpm is 030.

The (ff) code for the other options is S3.

The model number for the required motor is therefore 8LVA22.B1030S300-0.

Example order 2

A three-phase synchronous motor of type 8LVA33 with a nominal speed of 1500 rpm has been selected for an application.

The connection should use a double angled built-in connector. The motor should be equipped without a holding brake, with a smooth shaft end and resolver encoder. The motor should also be equipped with a oil seal.

The code (ee) for the encoder system is R0.

The code (nnn) for a nominal speed of 1500 rpm is 015.

The (ff) code for the other options is D6.

The model number for the required motor is therefore 8LVA33.R0015D600-0.

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