APC galaxy 9000 User Manual

34006451EN/AC

 - Page 23

Installation

2.9 Connections between cubicles

 (modular UPSs or parallel UPSs with SSC)

  

Connect the cable from connector XR3 (pins 7 to 12) of the rectifier-inverter cubicle remote relay board to connector XR1 of 

the battery cubicle containing battery circuit breaker QF1.

The UPS emergency shutdown function is generally wired to a "mushroom-head" type emergency off button.

Important: 

In the case of a complex installation with a number of units, there should only be one emergency shutdown pushbutton and 

this pushbutton must interrupt all the active conductors of all the units.

For the same reason, it is essential for the pushbutton to open the upstream mains 1, mains 2, and external maintenance 

bypass line protective circuit breakers.

Each type of unit (UPS and Static Switch Cubicle) must have an independent, volt-free contact connected to the emergency 

shutdown pushbutton. This pushbutton must therefore have as many contacts as there are units in the installation, as well as 

the contact or contacts required to open the upstream mains 1 and 2 protective circuit breakers. The emergency shutdown 

pushbutton turns off the rectifier-chargers and inverters and opens the battery circuit breakers. The emergency shutdown 

signal will be cleared when the emergency shutdown pushbutton contact has been reset.

The emergency shutdown pushbutton should not be connected to the Static Switch Cubicle since the pushbutton opens the 

circuit breaker protecting the upstream circuit (mains 2) and the Static Switch Cubicle is therefore no longer powered (invert-

ers off and mains 2 down).

On modular UPSs, interconnections are made on the APOZ (figure 17) and MISI (figures 19 to 21) boards in the UPS cubicles 

(see the layout of the boards in the figures in the previous section).

For parallel UPSs with a centralised SSC, interconnections are made on the APOZ boards in the UPS cubicles (figure 17) 
and the ACPZ boards (see the layout of the boards in the figures in the previous section) in the SSC (figure 18).

– these connections are made using the ribbon cables supplied;

– the purpose of the connection is to make a loop: connector XM137 of the APOZ board of one UPS being connected to 

connector XM136 of the APOZ board of the next UPS and so on until the first board is returned to.
Important: 

Outside the cubicles, group the APOZ inter-board and ACPZ or MISI inter-board connections with the inter-cubicle auxiliary 

connections, and separate this assembly from the power cables.

ribbon cables supplied