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VI. PARALLEL OPERATING INSTRUCTIONS
After all the electrical connections of UPS have been made and while all the circuit breakers and switches
of the device and the external battery cabinet are turned OFF (at “0” position);
1. Check the polarities of battery connections:
• + V (nominal voltage +360V, float charge voltage +405V)
• 0 V (common terminal for ‘’+’’ and ‘’-‘’ battery groups)
• - V (nominal voltage -360V, float charge voltage -405V)
2. Check 3-phase AC input and neutral connections (care should be taken for the phase order).
ATTENTION!!! TWO CABLES FOR EACH BATTERY GROUP SHOULD BE USED FOR EXTERNAL
BATTERY CONNECTION, AND THE COMMON POINT CONNECTIONS SHOULD BE MADE ON THE
NEUTRAL BUSBAR!
WARNING ! : UPS should never be operated without neutral connection.
3. Check the output load connections of UPS.
6.2.1 Starting UPSs from a completely shut down position:
1. Turn ON S1 (AC Input) switches (switch to ‘’1’’ position)
2. Turn ON S2 (Bypass) switches (switch to ‘’1’’ position)
3. Turn on S7 (On/Off) switches (to ‘’1’’ position). LCD panels activate and after some delay, input
contactors (K1) are energized and the rectifiers start. DC bus voltages reaches to their normal operation
level (+/-405V without batteries).
4. Turn ON S4 (AC Output) switches (switch to ‘’1’’ position)
5. After a while the inverter operations start and the inverter o/p voltages reaches their nominal level, the
output contactors (K2) are turned on. UPS outputs are transferred from bypass to inverter.
6. Turn on the battery switches/fuses on the UPSs (S5 for 10-80kva) or on the external battery cabinet (for
100-250kva). After connecting the batteries to the battery terminals, normal parallel operation of UPS
starts generating uninterruptable power for the critical loads.
6.2.2 Shutting down the UPS
After turning off all the critical loads supplied by the UPSs output:
1. Turn off S4 (AC Output) switch (to ‘’0’’ position).
2. Turn off S7 (On/Off) switch (to ‘’0’’ position).
3. Turn off the battery switch/fuses on the UPS (S5 for 10-80kva) or on the external battery cabinet
(for 100-250kva).
4. Turn off S2 (Bypass) switch (to ‘’0’’ position).
5. Turn off S1 (AC Input) switch (to ‘’0’’ position).
After performing the above procedure, UPSs are completetely shut-down. In this case PFC rectifiers and
inverters are not operating and the batteries are not being charged.
6.2 OPERATING INSTRUCTIONS FOR PARALLEL CONNECTED UPSs.
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