Stober PK - Ambient Conditions; Encoders

11.6.3 Ambient conditions
Standard ambient conditions for transport, storage and operation of the motor are described in this chap-
ter. Information about differing ambient conditions can be found in the chapter Derating.
Feature Description
Surrounding temperature for transport/storage −30 °C to +85 °C
Surrounding temperature for operation −15°C to +40°C
Relative humidity 5% to 95%, no condensation
Installation altitude ≤ 1000 m above sea level
Shock load ≤ 50 m/s
2
(5 g), 6 ms in accordance with EN
60068-2-27
Notes
• STOBER synchronous servo motors are not suitable for potentially explosive atmospheres.
• Secure the power cables close to the motor so that vibrations of the cable do not place impermissible
loads on the motor plug connector.
• Note that the braking torques of the holding brake (optional) may be reduced by shock loading.
• At operating temperatures below 0°C, note that the discs of the holding brake (optional) may ice up.
• Also take into consideration the shock load of the motor due to output units (such as gear units and
pumps) which are coupled with the motor.
11.6.4 Encoders
STOBER synchronous servo motors can be designed with different encoder models. The following chapters
include information for choosing the optimal encoder for your application.
11.6.4.1 Encoder measuring method selection tool
The following table offers a selection tool for an encoder measuring method that is optimally suited for your
application.
Feature Absolute encoder Resolver
Measuring method Optical Inductive Electromag-
netic
Temperature resistance ★★☆ ★★★ ★★★
Vibration strength and shock resistance ★★☆ ★★★ ★★★
System accuracy ★★★ ★★☆ ★☆☆
FMA version with fault exclusion for mechanical coupling
(option with EnDat interface)
✓ ✓ –
Elimination of referencing with multi-turn design (op-
tional)
✓ ✓ –
Simple commissioning with electronic nameplate ✓ ✓ –
Key: ★☆☆ = satisfactory, ★★☆ = good, ★★★ = very good
11.6.4.2 Selection tool for EnDat interface
The following table offers a selection tool for the EnDat interface of absolute encoders.
Feature EnDat 2.1 EnDat 2.2 EnDat 3
Short cycle times ★★☆ ★★★ ★★★
Transfer of additional information along with the position
value
– ✓ ✓
Expanded power supply range ★★☆ ★★★ ★★★
One Cable Solution (OCS) – – ✓
Key: ★★☆ = good, ★★★ = very good
11.6.4.3 EnDat 3 encoders
EnDat 3 is a robust, purely digital protocol that functions with minimal connection lines. EnDat 3 facilitates
the One Cable Solution, which allows the connection lines between the encoder and drive controller to be
routed along in the motor's power cable.
11.6 Product description 11 EZsynchronous servo motors
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