© EPS Stromversorgung in 2022, this information is subject to change without notice
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30000800_manual_psb_10000_4u_30kw_en_04
3.12.2
Series connection
Besides being able to work as a power supply, the device is also an electronic load.
Series connection in sink mode operation isn’t supported and must thus not be connected and oper-
ated (can void warranty)!
Series connection in source mode operation only at one’s own risk (can void warranty)!
Series connection in source mode operation is possible, but requires extra measures to ensure the device cannot enter sink
mode. This is achieved by setting the power and current set values for sink mode to zero.
There is furthermore a technical limit of the achievable total voltage which depends on the strength of insulation of the DC
plus and DC minus poles, as given in the technical specifications in
. These specifications determine how many units
with the same or different voltage rating can be operated in series and in case there are different models, it also determines
which model can be in what position.
Basic rule: when connecting models with different voltage ratings in series, their current and power ratings are usually also
different which result in a global current and power limit of the series that is defined by the unit with the smallest current or
power rating.
3.12.3
SEMI F47
SEMI F47 (the SEMI comes from semiconductor) is a specification that demands a device to continue working without in
-
terruption in case of a power failure in form of an AC supply undervoltage (here: sag) of max. -50% of the rated line voltage
with a max. duration of 1.7 seconds. From firmware KE 3.02 and HMI 3.02 this has been implemented for all 10000 series
devices, but cannot be obtained by installing an update.
SEMI F47 specifies a AC supply voltage sag in steps of increasing voltage:
Sag of
Duration at 50 Hz
Duration at 60 Hz
Duration in seconds
50%
10 cycles
12 cycles
0.2
30%
25 cycles
30 cycles
0.5
20%
50 cycles
60 cycles
1 s
3.12.3.1 Restrictions
•
The feature will be disabled automatically and also locked if the device boots with low AC supply voltage present, i. e. 208 V
(L-L) instead of the default 400 V (L-L), so it could not bridge the 1.7 s duration of the F47 pulse anymore. It means that
SEMI F47 isn’t available while derating is active.
•
It requires a decreased max. power, compared to the rated power of the particular model, thus SEMI F47 is also a sort of
derating, but it’s not depending on the line voltage but what the AC input circuit (PFC) can cover without running into a power
fail. This reduced power rating is activated and deactivated together with SEMI F47
3.12.3.2 Adjustments
•
SEMI F47 can either be activated/deactivated manually on the HMI (see
3.5.3.1) or a digital interface, unless blocked due
to the current device state.
3.12.3.3 Application
The feature can be activated at any time, unless blocked to the current devices, for example when low voltage derating is
already active (see
3.3.3.1). When activating it sometime during normal operation, the device will pop up a message after
leaving the menu, informing about the altered situation and also instantly reduce the max. available power, as well as adjust
the power set values, should the currently be higher than the new maximum. When deactivating the feature it goes vice
versa, only the power set values remain unaltered then. Due to the fact that the setting is stored beyond shutting down the
device, it could directly boot into SEMI F47 mode during next start, also showing that above mentioned pop-up once after
the start (the pop-up can be deactivated).
If later a voltage sag occurs, the level of sag or the duration decides whether the device continues its operation without
switching the DC output off or if it would show a
PF
alarm. Without SEMI F47 being activated, the PF alarm would appear
immediately while with activated SEMI F47 it’s delayed for at least 2 seconds or will never occur. In this case, the device
wouldn’t show any reaction to the sag, nor register the occurrence in any form.
