inform ETR EVO Series, Installation And Operating Manual

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ETR EVO UPS User Manual (Ver. 1.0) Page 55
9.2. High Inrush Current Load at the Output
Some loads absorb more current than their nominal current value for a short period of time when
they are energized. Ordinary UPS’s either switch off their output and they cause all the loads to
remain without energy or they pass to bypass, transferring all the loads to the mains.
ETR EVO UPS behaves like a current source in such a situation. (As long as the over current is drawn,
it decreases the output voltage keeping the output current constant at a certain value). Thus none of
the loads on the output are affected from this situation.
9.3. Bypass voltage bad shape Alarm
It means that Bypass mains voltage is different than the inverter reference signal. (e.g. it’s out of its
limits or the total harmonic distortion > %10)
Make sure that the bypass circuit breaker is “I" (if the UPS has no separate bypass mains input, make
sure that the input circuit breaker is "I ").
9.4. Bypass phase sequence wrong Alarm
It means that phase sequence of bypass mains voltage is not OK. Phase sequence of the separate
bypass mains input should be changed.
9.5. Bypass not synchronized Alarm
Frequency of bypass mains voltage is out of the frequency range for bypass operation or bypass mains
voltage is very low. Check if the bypass mains voltage is within the specified limits.
9.6. Input phase sequence wrong Alarm
It means that phase sequence of input mains voltage is not OK. Phase sequence of input mains input
should be changed.
9.7. Input not synchronized Alarm
Frequency of input mains voltage is out of the frequency range for input operation or input mains
voltage is very low. Check if input mains voltage is within specified limits.
9.8. DC voltage low/DC not equal to input voltage Alarms
Any of the DC bus voltage is lower than its lower limit. It means that the batteries had been
discharged. It is removed when the rectifier resets. If you encounter this alarm during start-up,
check if the inrush circuit breaker is at "I" position. Charge the batteries, perform battery test and
check if the alarm is removed.
9.9. Emergency power off active Alarm
It means that Emergency stop (EPO) is activated (digital input “UPS OFF” is set high). Check the "EPO"
input
9.10. Input Circuit Breaker Blown Out
If the input circuit breaker blows; it points out that there is output short circuit on Bypass Operation
or UPS might be breakdown. Please look at also
Section 9.1. Output Short Circuit Alarm .
UPS performs this feature if it is working in Online or Battery Operation.