COVER HS Series – User manual
COMEX S.A.
28
3.3 Bypass module
Bypass is an electronic uninterruptible switch that supplies voltage to the inverter output or
bypass circuit directly from the network. During normal operation, the receivers are powered
directly from the inverter output, but if events such as overload, overheat or inverter failure
occur, the load is automatically switched to the Bypass circuit.
To ensure uninterrupted switching between inverter operation and bypass operation, the
inverter output must remain synchronized with the Bypass line voltage at all times.
Synchronization is provided by the inverter voltage and frequency control system, which
ensures synchronization of the frequency generated by the inverter to the Bypass circuit
voltage, provided that the bypass voltage remains within the allowable tolerance range.
The UPS was additionally equipped with a service bypass system. The bypass is manually
switched on when maintenance work is required on the UPS. Bypass Bypass can only be
activated if the UPS is in Electronic Bypass mode.
Attention
When the UPS is in Bypass mode or Bypass Service mode, the connected receivers are not
protected by power outages and network disruptions.
3.4
Modes of operation
The COVER series HS power supply is a dual power processor that allows you to operate in
the following modes depending on your configuration:
Normal mode(On Line)
Battery mode
Automatic restart
Electronic bypass
Service bypass (mechanical)
Economical (ECO)
Frequency converter
Parallel mode
3.4.1
Normal mode
In normal operation, the output voltage from the UPS is generated by the inverter. Normal
operation means that there is a voltage in the professional network with the appropriate
parameters that feeds the power supply rectifier. Straight-up voltage is a source of power for
the inverter circuit, which produces a guaranteed voltage with stable and fully independent
input voltage parameters. In normal operation, rechargeable batteries are also charged.
3.4.2
Battery mode
In the event of a power failure in the professional network, the power supply inverter consumes
the energy stored in the battery. During power failure in the network, the battery is switched
to uninterruptible mode, which means that there is no power interruption from the point of
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