General description
UM0527
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synchronized with the mains, the ACF! signal is set to low and the inverter is
switched off.
–
Mains mode - in this mode the battery charger is switched on and the UPS is
supplied from the mains. The inverter is switched off (INV_A and INV_B are in low
state), and ACF! is high.
–
Buck mode - in this mode the battery charger is switched on and the UPS is
supplied from the mains. The ACH signal is switched on, the inverter is switched
off, ACF! is high and the ACL signal is in low state.
–
Boost mode - in this mode the battery charger is switched on and the UPS is
supplied from the mains. The ACL signal is switched on, the inverter is switched
off, ACF! is high and the ACH signal is in low state.
–
Standby mode - in this mode the battery charger is switched off and the UPS is
supplied from the battery. ACH and ACL are in low state, ACF! is low, CHOFF is
high, and the inverter is switched off.
–
Standby charge mode - the UPS is in this state when the mains is lower than the
low level boost mode. ACH and ACL are in low state, ACF! is high, CHOFF is low,
and the inverter is switched off.
–
OFF mode - the UPS in this mode is totally switched off. This state is availably only
in battery mode after pressing the on/off key longer than 4 seconds.
Additionally the UPS tests the battery. The battery test is done by switching to the inverter
mode. During the test the MCU measures UPS output load and battery voltage. If the
battery voltage during the test falls below the limit, the battery is failing. The value of the limit
depends on time and load current. The test can be forced by the user with a PC. The battery
condition can by checked after switching to the inverter mode without forcing the test. A load
is necessary to test the battery.
Table 11.
Signal state in different modes
Work mode
INV_A
INV_B
ACH
ACL
ACF!
CHOFF
SHD
Inverter mode
50 Hz (60 for US
version) PWM
signal (less than
40% duty cycle)
50 Hz (60 for US
version) PWM
signal (less than
40% duty cycle)
L
L
L
L
Signal is switched to
L after rising edge
INV_A or INV_B and
switched to H before
falling edge INV_A
or INV_B.
Mains mode
L
L
L
L
H
Depends on
battery
voltage
H
Buck mode
L
L
L
H
H
H
Boost mode
L
L
H
L
H
H
Standby mode
L
L
L
L
L
H
H
Standby charge
mode
L
L
L
L
H
Depends on
battery
voltage
H
Off mode
L
L
L
L
H
L
L