20 - 80 kVA parallel UPS systems
User’s and Installation Manual
1018390
Revision C
33
Local tie panel solutions
The internal wiring diagrams of SPM9305 tie cabinets can be used as a reference when
designing local tie panels.
Parallel UPS configurations require a tie panel at the system output. It must facilitate service
switches for each UPS module output. The system bypass switch is optional but helps when
doing the maintenance for the whole parallel UPS system.
It’s recommend to source cabinet, cables, busbars, terminals, fuses, switches and breaker
components from the local market. If needed, standard SPM9340 components can be
ordered as spare parts from the UPS manufacturer.
Notice!
The operational function of the S51 system bypass switch or equivalent breaker system must
be following:
1.
The system bypass switch S51 is turned from ”UPS” to ”UPS+BYPASS” position.
2.
Auxiliary contacts provide 10 ms leading signal with a closed contact
3.
One should check from the LCD panels that UPS modules are not unsyncronised and
the signal wiring polarity is correct.
4.
All parallel UPS modules receive the auxiliary contact signal simultaneously and
firmware transfers the UPS modules to internal bypass.
5.
Now, the S51 system bypass switch is in ”UPS+BYPASS” position. The UPS and BYPASS
power lines are in parallel and supply the load. The parallel UPS modules still receive
the auxiliary contact signal, thus, forcing the UPS modules to internal bypass lines.
6.
Turn S51 bypass switch to ”BYPASS” position. As a result, the system bypass line is
alone supplying the load.
7.
Load switches S11/S21/S31/S41 can be opened to do the maintenance in the parallel
UPS system.
6.7 Input filter option
The terminal X7 provides a temperature sensor connection for the 10% THDi input filter.
This terminal is located beside the input/output power terminals.
For more information see the installation instructions manual for the input filter option.