Battery Back-Up - Siemens SIMADYN D Hardware Manual

Subracks
Output voltage
System failure
message
2.1.3

Battery back-up

Battery connection
External battery
2-4
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All of the output voltages are monitored for an undervoltage condition
(e. g. as a result of overload/short-circuit).
Undervoltages at the output
V (5 V) < 4.7 ... 4.85 V
(for t>100-200 µs)
V (+ 15 V) < approx. 14 V
V (- 15 V) > approx. -14 V
The associated module („STOP" tab) is configured in HWConfig under
„Object properties" to define how the module behaves when a system failure
message is output (bus signal *RDYIN=low):
 Modules can reset their binary and analog outputs
 CPU modules can go into the „STOP" condition („H")
The SR6 subrack does not have its own back-up battery.
A back-up battery can be connected at the screw/plug-in terminal X2 to save
configured values (application software) during a power failure (using
function block SAV). The connection assignment is printed on the front
panel:
Connector X2, Pin Designation
1 0 V
2 BATAL
3 V cc
Current load: Approx. 10 µA depending on the particular CPU module
It is recommended that the battery is changed every year.
When using a Lithium battery, a series resistor of 39  must be provided to
prevent an inadmissibly high charging current when a fault condition
develops (5V of the power supply is applied to the battery via a defective
diode - which could be a potential explosion hazard).
The monitoring CPU module in SR6(V) does not initially identify when there
is no back-up battery or the back-up battery is discharged (no flashing „b").
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Response
Red fault LED is lit
The output voltages are shutdown
(CPU stop)
No automatic restart (the line supply
voltage must be disconnected)
Red fault LED is lit
5V voltage remains
System failure message
Comment
Battery ground
Battery monitoring („alarm" for logical 0)
+ 3.0 ...4.5 V battery voltage
Hardware - SIMADYN D
Industry Automation
Edition 04.2011
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