Riello MCT 20 - REDUNDANT AUXILIARY POWER SUPPLY FOR AUTOMATIC BYPASS; PROGRAMMABLE AUXILIARY SOCKET (POWER SHARE); POWER WALK-IN MODE; LOAD REDUCTION AT 200 V;208 V OUTPUT

R EDUNDANT A UXILIARY P OWER S UPPLY FOR A UTOMATIC B YPASS
The UPS is equipped with a redundant auxiliary power supply that enables the UPS to run on an automatic bypass even when a
failure occurs in the main auxiliary power supply. If a fault occurs in the UPS shutting off the main auxiliary power supply, the
load is powered by the automatic bypass. The multiprocessor board and the control panel are not powered so the LEDs and the
display are off.
P ROGRAMMABLE A UXILIARY S OCKET ( POWER SHARE )
The UPS has an output socket that enables the load applied to it to be disconnected automatically under certain operating
conditions. The events that determine the automatic disconnection of the Power share socket may be selected using the
configuration software (see the Configuration software and UPS Configuration paragraphs).
For example, the socket can be disconnected after a given time of battery operation, or when the battery low prealarm threshold
is reached or an overload occurs.
Safety notes: when the UPS is switched on, if the output switch (SWOUT) is opened, the Power share socket will
remain connected to the mains.
If the manual bypass switch (SWMB) is inserted, the output switch (SWOUT) is opened and when the UPS is
shutdown, the socket will be disconnected.
P OWER WALK - IN
The UPS has a Power Walk-in mode which can be enabled and configured using the configuration software. When the mode is
enabled and mains power is restored after a period of battery operation, the UPS starts to draw progressively from it so as not
to stress (due to the peak) any generating set installed upstream. The transient time may be set from 1 to 125 seconds. The
default value is 10 seconds. During the transient, the necessary power is drawn in part from the batteries and in part from the
mains, maintaining sinusoidal absorption. The battery charger is turned on again once the transient has passed.
R EDUCING THE L OAD ( TO 200V AND 208V)
If the output voltage is set to 200V and 208V (see “Configuring the UPS” paragraph), the maximum power output of the UPS is
reduced with respect to its rated value, as shown in the graph below: