COVER serii NHS – User Manual
COMEX S.A.
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inverter voltage and frequency control system, which guarantees synchronization of the voltage
generated by the inverter to the Bypass path voltage, provided that the voltage frequency in the Bypass
path remains within the permissible tolerance range.
The UPS has been additionally equipped with a service Bypass system. Bypass is manually activated
when maintenance work is required on the UPS. The Bypass service can only be enabled when the
UPS is in the Bypass electronic mode.
警告
危 险
Warning
When the UPS operates in Bypass or Bypass service mode, the connected receivers are not
protected by power failures and mains disturbances.
3.3. Power supply operation modes
The COVER NHS series power supply is a dual energy processing device that allows you to work in the
following modes:
Normal operation
Battery operation
Automatic restart
Bypass mode
Service Bypass mode
Eco mode
Frequency converter
Parallel mode
Hiberation mode
3.3.1. Normal operation
In normal operation, the output voltage from the UPS is generated by the inverter. Normal operation
means that there is voltage in the professional network that powers the UPS rectifier. The rectified
voltage is the power source for the inverter circuit, which produces a guaranteed voltage with stable
parameters that are completely independent of the input voltage. In normal operation, battery packs are
also charged.
3.3.2. Battery operation
In the event of a power failure in the professional network, the inverter of the power supply draws energy
accumulated in the battery bank. During a power outage in the network, the changeover to battery
operation takes place in uninterrupted mode, which means that no interruption in power supply is visible
from the point of view of the receivers being powered. 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 in the 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 can be configured for an automatic 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 is automatically and uninterrupted.
