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English
UPSI-IP-1 series | UPSI- IP-2 series
8 Initial operation
Ensure that the UPS is correctly installed. When at the left input jack an input vol-
tage higher than 12 V (UPSI-1208IP-11U / -23U) or 23 V (UPSI-2406IP-12U / -24U / -26U),
between 7/8 and 36 V (UPSI-1208IP-23UW / UPSI-2406IP-24UW / -26UW), respectively,
is connected, the battery pack gets queried and transmits its data. If the input voltage
is connected correctly, the battery pack gets queried and clears the pack via System
Present. Only then the charger gets enabled and the charging of the battery pack starts.
This process lasts only a few milliseconds.
The applied voltage at the input of the UPS is passed through to the output, reduced by a
current-dependent voltage drop as well as the cable length. The device charges the ener-
gy storage and monitors the upstream voltage thresholds at the input (UPS function). It
should be noted that at high load / high charging current in combination with long lines
(up to 3 m in length) up to 1 V and more can drop over these lines.
There must always be sufficient voltage at the source to balance this voltage drop. The
voltage drop also affects the voltage acceptance threshold. For example, although the
UPS (12 V version) is already in UPS operation at 11 V, the voltage on the load after a vol-
tage drop appears significantly reduced when there are long lines in combination with
high currents. Thus, the voltage on the UPS then drops during a takeover, e.g. to 10 V for
a few μs instead of the set 11 V. With a correspondingly high load / high charging current
or long lines, a perfect function can no longer be guaranteed. The reason for this ist, that
the threshold value of the input voltage falls below. Also make sure that the source provi-
des enough power to guarantee the charging process. This also applies to versions with
wide-range input (DC / DC converter upstream of UPSI). The voltage at the input terminals
of the converter must not fall below 6 V (therefore at least 7 V
IN
or 8 V
IN
for -UW devices).
Under certain circumstances, the voltage drop may be even higher at lower input vol-
tages.
