COVER serii NHS – User Manual
COMEX S.A.
21
3.3.5. Service bypass mode
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 switch the UPS to Bypass
mode and then turn on the Q3 Service Bypass switch disconnector. Then you can disconnect Q1, Q2
and Q4 - the receivers are supplied directly from the network.
警告
危 险
Warning
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 Bypass path is the preferred source of power 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. The changeover depending
on the network frequency is shorter than 10ms for the 50Hz network, and 8.2ms for the 60Hz network.
3.3.7. Frequency converter mode
In the frequency converter mode, the power supply can be used to generate a fixed value of 50 or 60 Hz
output frequency. 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.
3.3.8. Parallel operation mode
In parallel mode, there is the possibility of parallel connection to 6 devices of the same power to
increase the total system power or increase reliability.
3.3.9. Hiberation mode
There is possibility to switch each power module to special state called hibernation mode. It allows to
safe energy if the load is low and it is not need to use the power of whole UPS.
3.4. Battery management
3.4.1. Basic functions
When configuring the device, the technical service makes the settings of the following parameters:
1. The value of the battery charging current in Boost mode
2. Charging voltage in Boost mode (accelerated charging).
The charging voltage should be set depending on the type of batteries used.
For VRLA batteries, which are typically used in guaranteed power supply systems, the maximum
charging voltage in Boost mode should not exceed 2.4V / cell.
3. Charging voltage in Float mode (maintenance charging)
The voltage value should be set depending on the type of battery used. For VRLA batteries.
Charging voltage in Float mode should be in the range of 2.2V to 2.3V.
4. Temperature compensation of the charging voltage (option)
Depending on the type of batteries used, it is possible to set the charge voltage compensation factor
depending on the temperature.
5. Battery shutdown voltage (EOD)
In order to protect the battery against deep discharge, the cut-off voltage should be set within the
limits of 1.6 to 1.75V / cell for VRLA batteries. By attaining the cut-off voltage on the batteries, the
UPS is turned off and the batteries are isolated in order to protect them against too deep
discharging.
