Tescom DS300SHA Series, User Manual

Page: 47 / 57

44
4.2.3 Switching the UPS from a Normal Operation to Maintenance Bypass Condition
1. Enter COMMANDS menu by using UP and DOWN buttons on front panel during normal operation.
Select ENTER<BYPASS> command by using again the UP and DOWN buttons and pres ENTER
button. The critical load is transferred to bypass supply in this case and it is shown at LCD display with
“A09 MANUAL BYPASS” message. Besides L6 (load on UPS) light on front panel will be off and L2
light (bypass) will be on.
2. Turn on S3 (Maintenance Bypass) switch (after unlocking and taking away the padlock on it) to ‘’1’’
position.
3. Turn off S7, S5, S1, S2 and S4 switches (to ‘’0’’ position).
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 main menu will appear at 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.
6. Connect the batteries by turning on S5 (Battery) switch (to ‘’1” position).
Now UPS is ready for uninterruptable operation.