COVER series MZ – User manual
COMEX S.A.
interruption in power supply is visible from the point of view of the powered receivers. The
return of voltage in the professional network causes automatic return to work in normal mode,
without the need for intervention.
Note: The UPS can also be started from the battery in so-called "Cold start", i.e. in the absence of a basic
power supply.
3.3.3. The restart mode of the power supply after power back
In case of prolonged power failure, when the batteries are discharged after reaching the
minimum voltage (EOD - End Off Discharge). The UPS inverter is turned off. The power supply
unit can be configured to automatically restart after the time delay set by the service technician,
after the power supply has been restored. The restart mode and any delay of switching on the
inverter can be programmed by the manufacturer's service.
During the programmed delay time of switching on the inverter, the batteries are charged so
that after switching on the inverter, the receivers are protected in the event of a power failure.
3.3.4. Bypass mode
In the event of overloading the power supply, overheating or other reasons, eg damage to the
inverter in the normal operation mode, the automatic supply of Bypass. Bypass is automatically
and uninterrupted.
3.3.5. Service bypass
Manual service bypass in which the UPS has been equipped, enables periodic maintenance
works on the device, without depriving the connected receivers of the power supply. The service
Bypass can only be enabled when the UPS is in the Bypass electronic mode. Therefore, first of
all switch the UPS to Bypass mode, and then turn on the service Bypass switch.
When the UPS is in Bypass service mode, power modules and LCD display do not work. It should be
remembered that there is dangerous voltage on the terminal block to which the power supply and the load
are connected.
3.3.6. ECO mode
In the ECO operating mode, the receivers are supplied directly from the network via the Bypass
reserve track, which increases the efficiency of the power supply and reduces energy
consumption. In the ECO mode, the preferred power source is the Bypass path until the voltage
and frequency remain within the permissible tolerance. If the voltage parameters in the Bypass
path are outside the specified tolerance range, the inverter output automatically switches to
power supply. Switching depending on the network frequency is shorter than 15 ms for 50 Hz
networks, and 12.5 ms for 60 Hz networks.
3.3.7. Frequency converter mode
In the frequency converter mode, the power supply can be used to generate a fixed value of an
output frequency of 50 or 60 Hz. The range of input frequency tolerance at which a stable output
frequency can be generated is 40-70 Hz. Bypass is not available in this operating mode. In the
event of a power failure, the UPS generates the set frequency value using the battery voltage.
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General