IV306E Rev. 004 Siel S.p.A.
Page 31 of 37 + 12 Tables, 14 F FR
Issued date: 2014-03-24
The display unit will show the alarm:
"Inverter locked"
Mute the acoustic alarm by pressing key 1.
[2a) Repeat the operation on the other machines]
3) Open the front door of the UPS and switch off the following switches: S4 (Reserve mains)
S2 (UPS Output)
4) Open the battery disconnecting switch.
5) Open switch S1 (rectifier input).
6) In this way the UPS is switched off and the load is no longer supplied.
Wait for about 10 minutes before accessing the inside of the UPS for check and maintenance
operations.
7) To switch the UPS on again, repeat the start-up operations as described above.
SWITCHING FROM UPS TO BYPASS
[External to the UPS]
1. 1) During UPS operation, press key 9 shown in Figure 4 (changeover confirmation) and
simultaneously press key 10 (changeover). Check the load is powered by reserve line (LED 6 in
Figure 6 on, Load on mains LED 4 off).
2. Press pushbutton 7 (Run/stop confirmation) and simultaneously press pushbutton 8 (Inverter stop).
Check LED 3 (Inverter ON) extinguishes.
3. 3) Close bypass disconnecting switch S3 (Figure 3).
[SW4 of Figure 11]
4. From now on, the load is supplied on bypass.
5. 5) To completely switch the UPS off, open rectifier input disconnecting switch S1, reserve input
disconnecting switch S4, and UPS and battery output disconnecting switch S2.
SWITCHING FROM BY-PASS TO UPS
1) Check that UPS output disconnecting switch S2 is open, and close reserve mains input and rectifier
input disconnecting switches S4 and S1 (Figure 3). Check that LED 6 (load on mains) and LED 1
(rectifier on) are on. The UPS supplies the load through the manual bypass from the reserve mains
and the rectifier is in operation.
2) Wait for the "Battery voltage OK". The red LED 2 (Battery voltage not OK) should have gone on
and then off. Now the rectifiers have performed the soft-start operation and it is possible to connect
the battery without any danger of compromising battery protections (fuses).
3) Close the external battery switch. From now on, the batteries are connected to the UPS.
4) Check that the "Load on reserve" message is displayed, and close UPS output disconnecting switch
S2. In this situation, the load is powered both by the external bypass disconnecting switch and the
UPS static switch.
5) Open the external bypass disconnecting switch. In this situation, the load is supplied by the mains
through the static switch.
6) Press pushbutton 7 (inverter start/stop confirmation) and simultaneously press pushbutton 6
(inverter start).
7) Check that after about 30 seconds, LED 6 (load on mains) extinguishes and LED 4 (load on
inverter) lights up. From now on, the load is supplied by the inverter.
[from inverters connected in
parallel]
