Switch-mode power supply AC2000 N1 / DC2000 N1 / AC3000 N1 / DC3000 N1 - Operating instructions
80001533 EFE en Page 36 of 41
6.4 Special functions
6.4. 1 Parallel operation
Due to the inclination of the voltage level of approx. 1 %, a load
distribution of approx. 10 % of the nominal system current is achieved
when several switched-mode power supply units are operated in
parallel. If the load sharing is to be optimized, the output voltage of the
device with the lowest load current must be increased and the output
voltage of the device with the highest load current must be reduced.
Selective monitoring of the individual SNTs is only possible with
external decoupling diodes in the output.
Systems with redundancy:
As the devices can be connected in parallel, it is possible to set up
systems for redundant operation according to the n+1 principle.
6.4.2 Island networks
Mains overvoltages in the range of seconds are to be expected when
connecting the switched-mode power supply unit to stand-alone grids.
For example, up to 20 % overvoltage in the range of seconds can
occur when feeding through rotating converters. The switched-mode
power supply is protected against this.
Mains overvoltage monitoring (section 6.2.6) sets the appliance to
stop for the duration of the overvoltage and restarts it with "Soft start"
once the voltage peak has subsided.
The devices in the DC series are designed for a transient overvoltage
at the input of 1.6 times the rated input voltage (for 3 seconds).
6.5 Signalling
The faults are displayed via LEDs on the front and reported as a
collective message via a potential-free collective fault relay
(changeover contact) on signal connector X11. The contact between
X11:12 and X11:13 is closed in the event of a device failure or fault.
The LEDs are set to the European/international colour scheme at the
factory (see section 6.6). The inverted colour scheme (red and
green reversed) is available on request for the Asian market.
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