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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 data 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. A disadvantage is the low accuracy of 6-10 arcmin. Furthermore, no multi-turn variant with resolvers is 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 switching 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 with DIN 748. They can be delivered with a smooth shaft or a keyed shaft (depending on motor size).

Smooth shaft endA 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.
Keyed shaft endA 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.

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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