© EA Elektro-Automatik in 2022, this information is subject to change without notice
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06230820_manual_psi_10000_3u_15kw_en_01
3.11.2
Series connection
Series connection of two or multiple devices is basically possible. But for reasons of safety and isolation, following restrictions
apply:
•
Both, negative (DC-) and positive (DC+) output poles, are connected to PE via type X capacitors
•
None DC minus pole of any unit in the series connection must have a potential against ground (PE) higher
than specified in the technical data! The maximum allowed potential shift varies from model to model
and is different for DC plus and DC minus
•
Remote sensing must not be used!
•
Series connection is only allowed with devices of the same kind and model, i.e. power supply with power
supply, and ideally same ratings, but especially the current rating should match
Series connection in Master-Slave mode isn’t supported. It means, all units have to controlled separately regarding set values
and DC output status, whether it’s manual control or remote control (digital or analog).
Due to the max. allowed potential shift on the DC output certain models are not allowed for series connection at all, like the
1000 V model, because the DC plus there is only isolated up to 1000 V. On the contrary, two 500 V models are eligible for
series connection.
Analog interfaces on the units in serial connection can be connected in parallel, because they are galvanically isolated. It’s
also allowed to ground the GND pins of the analog interfaces connected in parallel, which may happen automatically, when
connecting them to a controlling device such as a PC, where grounds are directly tied to PE.
3.11.3
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/HMI 3.02 this has been implemented for all 10000 series devices,
but cannot be obtained by installing an update on older production dates.
SEMI F47 specifies a voltage sag in steps with 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
3.11.3.1 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
3.11.3.2 Adjustments
SEMI F47 can either be activated/deactivated manually on the HMI (see
3.4.3.1) or a digital interface, unless blocked due to
the current device state.
3.11.3.3 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
3.2.3.1). 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.
