Siemens SITOP PSU8600 Manual page 165

Power supply system
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Connecting several BAT8600 battery modules
In hazardous zones (ex-applications), is absolutely not permissible that BAT8600 battery
modules are connected in parallel.
In order to extend the power failure buffering time, up to 5 identical SITOP BAT8600 battery
modules can be connected to a UPS module.
Note
When connecting several battery modules in parallel (max. 5), then the following applies:
1. Ensure that the battery modules have the same charge state
2. Use identical conductor cross-sections and conductor lengths for the "+" and "-"
connections.
3. Route the "+" conductor from the UPS module to the first battery module - and then loop
further.
Route the "-" conductor from the UPS module to the last battery module - and then loop
further.
See the following diagram "Recommended wiring for up to 5 battery modules connected
in parallel".
Power supply system SITOP PSU8600
Manual, 09.2018, A5E36758446-5-76
WARNING
6.8 Connecting battery modules to the UPS module
Installation
165

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