UM0527
General description
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Note:
Long = 2 s, Short = 20 ms
Additionally the state of OUT_REL is stored in EEPROM memory and restored after a cold
start independent of the AUTOSTART setting.
1.2.9 LEDs
LEDs indicates the state of the UPS. The active state is H.
1.2.10 Charger
The battery charger works in two steps: constant current charging and hysteresis constant
voltage. In the constant current step, the battery is charging in current mode until the voltage
of the battery is lower than 28.2 VDC. In the second step, the charger is switched on when
the battery voltage is lower than 26.8 VDC and switched off if the value is higher than 27.8
VDC. The microcontroller controls the process by switching the CHOFF signal.
8
Off
L
Short
L
H
9
Off
L
Long
Rise to H
H
Table 13.
Working modes (continued)
No
Working mode
State
Action
Reaction
OUT_REL
BUTTON L time
OUT_REL
ON/OFF
Table 14.
LED states
State
LED green
LED yellow
LED red
Mains mode
L
H
H
Battery mode
H
L
H
Low battery in battery mode
H
2 Hz 50% duty cycle
H
Buck/boost mode
2 Hz 50% duty cycle
H
H
Battery charging
L
2 Hz 50% duty cycle
H
Overload (mains)
L
H
2 Hz 50% duty cycle
Overload ( battery)
H
L
2 Hz 50% duty cycle
Self test
L
L
H
Fault ( mains)
L
H
L
Fault (battery)
H
L
L
Standby mode
H
H
0,5 Hz 50% duty cycle
Table 15.
Battery charge modes
Step of charge
process
Battery
voltage
CHOFF
Description
Current mode charging
< 28,2 V
L
Charging mode active only after battery working
mode.
>= 28,2 V
H
Switch to buffered working mode.
