B&R 8JSA2 Series, User Manual, Page: 16 / 98

Technical data • Motor encoder system (ee)
16 8JSA user's manual V1.00
6 Motor encoder system (ee)
8JS A c d . ee nnn ff gg - h see "Order key" on page 13
8JS three-phase synchronous motors are available with EnDat encoders as well as resolvers. The encoder system
is specified as part of the model number in the form of a 2-digit code (ee).
Analog and digital transfer
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 arcminutes. There is still no multi-turn variant with
resolvers.
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. In EnDat 2.1 analog/digital sampling, a very fine resolution is achieved by the
evaluation modules developed by B&R.
6.1 EnDat 2.1 encoders - Technical data
Motor sizes 2-3
Encoder type / Order code E8 E9
Operating principle Inductive
EnDat protocol 2.1 2.1
Functional safety --- ---
Single-turn / Multi-turn S M
Revolutions 1 4096
Resolution
[bits single-turn / bits mul-
ti-turn] 18/0 18/12
Precision ["] 280 280
Switching frequency ≥ [kHz] 6 6
Vibration during operation -
Stator
Max [m/s2] 300 300
Vibration during operation -
Rotor
Max [m/s2] 300 300
Shock during operation max
[m/s
2
] 1000 1000
Manufacturer's product ID ECI 1118 EnDat01 EQI 1130 EnDat01
Manufacturer's website www.heidenhain.de
Encoder type / Order code E4 E5
Operating principle Optical Optical
EnDat protocol 2.1 2.1
Functional safety --- ---
Single-turn / Multi-turn S M
Revolutions 1 4096
Resolution
[bits single-turn / bits mul-
ti-turn] 13/0 13/12
Precision ["] 60 60
Switching frequency ≥ [kHz] 190 190
Vibration during operation -
Stator
Max [m/s2] 200 200
Vibration during operation -
Rotor
Max [m/s2] 200 200
Shock during operation max
[m/s
2
] 1000 1000
Manufacturer's product ID ECN 1113 EnDat01 EQN 1125 EnDat01
Manufacturer's website www.heidenhain.de