inform ETR EVO Series, Installation And Operating Manual

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ETR EVO UPS User Manual (Ver. 1.0) Page 54
9. TROUBLESHOOTING
The aim of this chapter is to understand some specific problems, to verify the cause of the problems
and to provide solution to them.
First things to do:
1. Check and verify that PE connections are done properly.
2. Check and verify if all the cables are connected to the right terminals.
3. Check and verify if the mains exist and if it is within the limits.
4. Check and verify that all the circuit breakers for UPS in the distribution panel are at “I”
position.
5. Check and verify that all the circuit breakers of UPS are at “I” position.
6. Check and verify that Input/Bypass sequence is correct.
9.1. Output Short Circuit Alarm
If a short circuit occurs at the output of the unit, UPS acts like a current source (as long as the over
current is drawn, it decreases the output voltage keeping the output current constant at a certain
value) forcing to trigger the circuit breaker that is between the UPS and the short-circuited load. By
triggering the mentioned circuit breaker, the short circuited line is being removed and the other loads
that are present on the other lines are being prevented to be affected from this failure.
Please follow the steps below when “Output short circuit” alarm occurs;

Switch the output circuit breaker (F2) of UPS to “0” position.

Start-up UPS in Online Operation.

Wait to see “Online Operation” shown on LCD.

Switch the output circuit breaker (F2) of UPS to “I” position.

If the rating of each individual load circuit breaker is properly selected; then the circuit breaker of
short circuited load would be blown. If not properly selected, then “Short Circuit Alarm” would
be shown on LCD. In this case the short-circuited load should be found-out and removed.
Hazardous voltage exists and high temperature metal parts present inside even if the UPS is
disconnected. Contact may cause electric shock and burns. All operations except replacing
battery fuses shall be carried out by the authorized technical personnel only.
To enable the short circuit protection feature of the UPS, each load shall be supplied
over a
separate circuit breaker chosen according to the load current. This may provide quick
disconnection of the short circuited line
and operation continuity of the other loads.
To
obtain maximum protection, the rating of each individual load circuit breaker shall
have the
minimum value, which is enough to carry the full load current continuously.
Additionally UPS
should operate in Online or Battery Operation.