TRIO-UPS-2G/1AC/24DC/10
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10
Method of operation
10.1
Output characteristic curve
The uninterruptible power supply works with a dynamic
power reserve – the dynamic boost – in accordance with the
U/I characteristic curve shown in the illustration. In the event
of a secondary-side short circuit or overload, the output
current is limited to 1.5
x
I
N
. The device does not switch off,
but instead continues to supply the output current. The
secondary voltage is then reduced until the short circuit is
eliminated. The U/I characteristic curve with the dynamic
power reserve makes it possible to provide high switch-on
currents of capacitive loads or inductive loads reliably.
Figure 34
U/I characteristic curve with dynamic load
reserve
–
U
N
= 24 V
–
I
N
= 10 A
–
I
dyn. BOOST
= 15 A
–
P
N
= 240 W
–
P
dyn. BOOST
= 360 W
10.2
Dynamic Boost
The following example is used to explain how the
uninterruptible power supply dynamic boost functions.
Example:
The uninterruptible power supply supplies a connected
base load of 80%
until time point t
1
(see illustration,
schematic diagram of the dynamic boost behavior). If an
additional load is activated while the device is in operation,
the dynamic boost is requested for the period of time t
1
to t
2
.
The uninterruptible power supply provides the maximum
dynamic power reserve of an additional
70%
(
Δ
P
dyn.
boost
=
1.5
x
I
N
x
U
N
-
P
initial load
).
As such, the requested overall total power corresponds to
150%
of the nominal power. This power can be accessed for
at least 5
s in the event that the output voltage remains the
same. On reaching time point t
2
, the dynamic boost is once
more returned to the output value of the base load for
thermal offloading of the uninterruptible power supply. In this
case, the base load amounts to the same value of
80%, as it
was prior to time point t
1
. If the request to supply the load still
exists when the time intervals t
2
to t
3
have expired (at least
4
*
t
Boost
), a new cyclical switching of the dynamic power
reserve occurs, to a total of
70%.
Figure 35
Schematic diagram of dynamic boost behavior
11
Battery management
The TRIO-UPS battery management is divided into two tests
that are performed cyclically during normal operation.
11.1
Battery presence test
The battery presence test is used to detect whether a
correctly installed battery is present. If this is not the case,
the test fails and the green and red LED control lamps come
on and stay on.
11.2
Quality check of battery
The battery quality test is a life cycle test.
When the maximum charging time has been exceeded,
conclusions can be drawn regarding the maximum service
life of the battery, for example. If an event arises, the green
and red LED control lamps come on and stay on.
11.3
Battery charging
The device has a maximum charging current of 3
A.
Refer to the following table for the times required to recharge
a fully discharged battery.
I
[A]
OUT
U[
V
]
OUT
U
N
I
N
U < 0,9 x U
N
t 5 s
1,5 x I
N
dyn. Boost
≥
The permanent output power P
N
is limited at
an ambient temperature of 60 °C. Observe all
the maximum output powers for the
respective operating conditions.
t [s]
t
1
...
5s
20s
5s
20s
t
2
t
3
t
4
t
5
I
OUT
[A]
I
dyn. Boost
80%
100%
