COVER series MZ – User manual
COMEX S.A.
18
3.2.1.
Bypass module
The Bypass system is an electronic uninterruptible switch that supplies voltage to the receivers
from the inverter output or via Bypass track. During normal operation, the receivers are
supplied directly from the inverter output, but in the case of events such as overload,
overheating or damage to the inverter, the loads are automatically switched to the power
supply from the Bypass track.
To ensure an uninterrupted switch between inverter operation and Bypass operation, the
inverter output must be synchronized with the Bypass line voltage at all times. Synchronization
is ensured by the inverter voltage and frequency control system, which guarantees
synchronization of the frequency generated by the inverter to the Bypass voltage, provided that
the voltage frequency in the Bypass 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.
Warning
When the UPS operates in Bypass or Bypass service mode, connected receivers are not
protected by power failures and mains disturbances.
3.3.
Power supply operation modes
COVER MZ series power supply is a device with double energy conversion, which allows you
to work in the following modes depending on the configuration:
Online mode
Battery mode
The restart mode of the power supply after power back
Bypass mode
Service bypass mode
ECO mode
Frequency converter mode
Parallel mode
3.3.1.
Online 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 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 mode, battery packs are also charged.
3.3.2.
Battery mode
n 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
switch to battery operation takes place in an uninterrupted mode, which means that no
警告
危 险
