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After performing the above procedure, UPS is completely shut-down. In this case PFC rectifier and inverter
are not operating and the batteries are not being charged.
4.2.3 Switching the UPS from a Normal Operation to Maintenance Bypass Condition
1. Select COMMANDS menu by using () and () buttons on front panel during normal operation.
Select ENTER<BYPASS> command by using the UP and DOWN buttons and press ENTER button.
The critical load is transferred to bypass supply in this case and this event is indicated on the mimic
diagram and also with “A09 MANUAL BYPASS” message.
2. Turn on S3 (Maintenance Bypass) switch (after unlocking and taking away the padlock on it) to ‘’1’’
position.
3. Turn off S7, , S1, S2 and S4 switches (to ‘’0’’ position).
4. Disconnect the batteries from the UPS, using the battery switch/fuses on the UPS (S5 for 10-80kva) or
on the external battery cabinet (for 100-250kva).
In this case, bypass voltage is connected directly to the output of UPS and the critical load is supplied via
maintenance bypass switch. No AC or DC supply is connected to the inside and the circuits of UPS.
4.2.4 Switching the UPS from a Maintenance Bypass Condition to Normal Operation
1. Turn on S1 (AC Input) switch (to ‘’1’’ position).
2. Turn on S2 (Bypass) switch (to ‘’1’’ position).
3. Turn on S4 (AC Output) switch (to ‘’1’’ position).
4. Turn on S7 (On/Off) switch (to ‘’1’’ position). LCD panel activates, and mimic diagram (STATUS) will
appear on the display. Also “A08 ON MAINTENANCE” message shown and the inverter will not start
yet.
5. Turn off S3 (Maintenance Bypass) switch (to ‘’0’’ position). Inverter will start automatically following the
turning off of S3 switch. The operation can be monitored on the mimic panel.
6. Connect the batteries by turning on the battery switch/fuses on the UPS (S5 for 10-80kva) or on the
external battery cabinet (for 100-250kva).
Now UPS is ready for uninterruptable operation.
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