Siemens SLI-5310 Betriebsanleitung PDF herunterladen (Seite 85)

85

Connection of the buffer battery

The multiturn function of the EBI 135 and

EBI 1135 is realized through a revolution

counter. To prevent loss of the absolute

position information during power failure,

the EBI must be driven with an external

buffer battery.

A lithium thionyl chloride battery with 3.6 V

and 1 500 mAh is recommended as buffer

battery. A service life of over 10 years in ap-

propriate conditions (one EBI per battery;

ambient temperature 25 °C; shaft at stand-

still, self-discharge < 1 % per year) can be

expected. To achieve this, the main power

supply (U

P

) must be connected to the en-

coder while connecting the buffer battery,

or directly thereafter, in order for the en-

coder to become fully initialized after hav-

ing been completely powerless. Otherwise

the encoder will consume a signiﬁ cantly

higher amount of battery current until main

power is supplied the ﬁ rst time.

Ensure correct polarity of the buffer battery

in order to avoid damage to the encoder.

If the application requires compliance with

DIN EN 60 086-4 or UL 1642, an appropri-

ate protective circuit is required for protec-

tion from wiring errors.

If the battery voltage falls below certain

limits, the EBI issues warnings or error

messages over the EnDat interface:

• “M Battery” warning

2.6 V to 2.9 V (typically 2.7 V)

• “M All Power Down” error message

2.0 V to 2.4 V (typically 2.2 V): the

encoder has to ﬁ nd a new reference.

The EBI uses low battery current even

during normal operation. The amount of

current depends on the ambient

temperature.

Encoder Subsequent electronics

Normal operation at U

BAT

= 3.6 V

Ambient temperature [°C]

Battery current [μA]

Typical discharge current in normal operation

 = Protective circuit

EBI 135/EBI 1135 – external buffer battery

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