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4.
Switch on the ac input circuit breaker and the bypass input circuit breaker.
DO NOT switch on the battery circuit breaker at this time.
5.
On the Centric main menu, choose "Operation > Turn on/off > System on".
6.
Wait until the LED on the left front of all UPS modules is lit green.
This takes about 2 minutes.
7.
Now switch ON the battery cabinet circuit breaker.
5.3
Battery circuit breaker trip coil
The Centric includes a dry contact that closes when the EPO switch has been activated. This dry contact
can be connected to an optional trip coil on the battery box circuit breaker. This will cause the battery
circuit breaker to open when the EPO switch is activated.
The battery circuit breaker trip coil dry contact is located on the rear of the Centric controller, in connector
group 3 (see Figure 32), to the right of the EPO connector (see item 2 in Figure 36). It is labeled "Battery
CB trip coil". The dry contact is "normally opened" (N.O.), and has two pins. The contact is voltage free; it
can accept up to 250 Vdc 2 A.
5.4
Load-on-bypass dry contact
The Centric includes a dry contact ("Load on Bypass" dry contact) that closes when the Centric goes into
bypass mode. This can be used to trigger an external circuit, such as an audible or visual alarm.
The "Load on Bypass" dry contact is located on the rear of the Centric controller, in connector group 3
(see Figure 33, and item 4 in Figure 34). This dry contact is normally opened (N.O.), and has two pins. The
contact is voltage free; it can accept up to 250 Vac 10 A.
5.5
Surge protector malfunction alarm
The Centric 3x480 system is equipped with a MOV-type (Metal Oxide Varistor) surge protector. If the surge
arrestor malfunctions, a system alarm is generated. The MOV surge protector makes use of the input dry
contacts AUX2 and COM to transmit the alarm to the Centric. This relay is Normally Open, and closes
when the surge arrestor detects a malfunction.
If your Centric is configured for "4-wire + Ground" infrastructure see Figure 12 and
the notice about the surge arrestor, on page 19.
5.6
Forced bypass for maintenance bypass
The presence of a manual maintenance bypass switch is an optional feature, specified when ordering a
Centric 3x480 system.
The procedure for putting the Centric in maintenance bypass mode includes the requirement that the
Centric be in regular bypass mode before it is switched into maintenance bypass mode. If the operator
neglects to put the system in regular bypass mode, damage to the system can result, because the inverter
will be exposed to current from the mains.
To avoid this danger, the "forced bypass" contacts can be used to put the Centric in regular bypass mode
automatically whenever the maintenance bypass switch is operated.
The forced bypass contacts are normally open. Closing them forces the Centric into regular bypass mode
immediately. So, the forced bypass contacts should be wired so that they will be closed by the user's
maintenance bypass switch, to ensure that the UPS is in bypass mode before it is put into maintenance
bypass model.
The forced bypass contact is located in connector group 3. See Figure 33 and Figure 34.
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AMATRONIC
LECTRONIC
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NDUSTRIES
TD
Centric 3x480 Vac, Installation Guide, rel. 2.2
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